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</button> <ul id="toc-Terminology-sublist" class="vector-toc-list"> <li id="toc-Red_tide" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Red_tide"> <div class="vector-toc-text"> 2.1 Red tide </div> </a> <ul id="toc-Red_tide-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Types" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Types"> <div class="vector-toc-text"> 3 Types </div> </a> <button aria-controls="toc-Types-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Types subsection </button> <ul id="toc-Types-sublist" class="vector-toc-list"> <li id="toc-Cyanobacteria" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cyanobacteria"> <div class="vector-toc-text"> 3.1 Cyanobacteria </div> </a> <ul id="toc-Cyanobacteria-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Dual-stage_life_systems_of_algal_species" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Dual-stage_life_systems_of_algal_species"> <div class="vector-toc-text"> 3.2 Dual-stage life systems of algal species </div> </a> <ul id="toc-Dual-stage_life_systems_of_algal_species-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Diatoms_and_dinoflagellates_(in_marine_coastal_areas)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Diatoms_and_dinoflagellates_(in_marine_coastal_areas)"> <div class="vector-toc-text"> 3.3 Diatoms and dinoflagellates (in marine coastal areas) </div> </a> <ul id="toc-Diatoms_and_dinoflagellates_(in_marine_coastal_areas)-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-List_of_common_HAB_genera" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#List_of_common_HAB_genera"> <div class="vector-toc-text"> 4 List of common HAB genera </div> </a> <ul id="toc-List_of_common_HAB_genera-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Causes" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Causes"> <div class="vector-toc-text"> 5 Causes </div> </a> <button aria-controls="toc-Causes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Causes subsection </button> <ul id="toc-Causes-sublist" class="vector-toc-list"> <li id="toc-Nutrients" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nutrients"> <div class="vector-toc-text"> 5.1 Nutrients </div> </a> <ul id="toc-Nutrients-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Climate_change" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Climate_change"> <div class="vector-toc-text"> 5.2 Climate change </div> </a> <ul id="toc-Climate_change-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Causes_or_contributing_factors_of_coastal_HABs" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Causes_or_contributing_factors_of_coastal_HABs"> <div class="vector-toc-text"> 5.3 Causes or contributing factors of coastal HABs </div> </a> <ul id="toc-Causes_or_contributing_factors_of_coastal_HABs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_causes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_causes"> <div class="vector-toc-text"> 5.4 Other causes </div> </a> <ul id="toc-Other_causes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Number_and_sizes" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Number_and_sizes"> <div class="vector-toc-text"> 6 Number and sizes </div> </a> <ul id="toc-Number_and_sizes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Harmful_effects" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Harmful_effects"> <div class="vector-toc-text"> 7 Harmful effects </div> </a> <button aria-controls="toc-Harmful_effects-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Harmful effects subsection </button> <ul id="toc-Harmful_effects-sublist" class="vector-toc-list"> <li id="toc-Human_health" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Human_health"> <div class="vector-toc-text"> 7.1 Human health </div> </a> <ul id="toc-Human_health-sublist" class="vector-toc-list"> <li id="toc-Food" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Food"> <div class="vector-toc-text"> 7.1.1 Food </div> </a> <ul id="toc-Food-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Drinking_water" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Drinking_water"> <div class="vector-toc-text"> 7.1.2 Drinking water </div> </a> <ul id="toc-Drinking_water-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Neurological_disorders" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Neurological_disorders"> <div class="vector-toc-text"> 7.1.3 Neurological disorders </div> </a> <ul id="toc-Neurological_disorders-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Effects_on_humans_from_harmful_algal_blooms_in_marine_environments" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Effects_on_humans_from_harmful_algal_blooms_in_marine_environments"> <div class="vector-toc-text"> 7.1.4 Effects on humans from harmful algal blooms in marine environments </div> </a> <ul id="toc-Effects_on_humans_from_harmful_algal_blooms_in_marine_environments-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Economic_impact" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Economic_impact"> <div class="vector-toc-text"> 7.2 Economic impact </div> </a> <ul id="toc-Economic_impact-sublist" class="vector-toc-list"> <li id="toc-Recreation_and_tourism" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Recreation_and_tourism"> <div class="vector-toc-text"> 7.2.1 Recreation and tourism </div> </a> <ul id="toc-Recreation_and_tourism-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fisheries_industry" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Fisheries_industry"> <div class="vector-toc-text"> 7.2.2 Fisheries industry </div> </a> <ul id="toc-Fisheries_industry-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Environmental_impact" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Environmental_impact"> <div class="vector-toc-text"> 7.3 Environmental impact </div> </a> <ul id="toc-Environmental_impact-sublist" class="vector-toc-list"> <li id="toc-Dead_zones" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Dead_zones"> <div class="vector-toc-text"> 7.3.1 Dead zones </div> </a> <ul id="toc-Dead_zones-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fish_die-offs" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Fish_die-offs"> <div class="vector-toc-text"> 7.3.2 Fish die-offs </div> </a> <ul id="toc-Fish_die-offs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Land_animal_deaths" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Land_animal_deaths"> <div class="vector-toc-text"> 7.3.3 Land animal deaths </div> </a> <ul id="toc-Land_animal_deaths-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Effects_on_marine_ecosystems" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Effects_on_marine_ecosystems"> <div class="vector-toc-text"> 7.4 Effects on marine ecosystems </div> </a> <ul id="toc-Effects_on_marine_ecosystems-sublist" class="vector-toc-list"> <li id="toc-Marine_life_exposure" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Marine_life_exposure"> <div class="vector-toc-text"> 7.4.1 Marine life exposure </div> </a> <ul id="toc-Marine_life_exposure-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Potential_remedies" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Potential_remedies"> <div class="vector-toc-text"> 8 Potential remedies </div> </a> <button aria-controls="toc-Potential_remedies-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Potential remedies subsection </button> <ul id="toc-Potential_remedies-sublist" class="vector-toc-list"> <li id="toc-Reducing_nutrient_runoff" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Reducing_nutrient_runoff"> <div class="vector-toc-text"> 8.1 Reducing nutrient runoff </div> </a> <ul id="toc-Reducing_nutrient_runoff-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Chemical_treatment" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Chemical_treatment"> <div class="vector-toc-text"> 8.2 Chemical treatment </div> </a> <ul id="toc-Chemical_treatment-sublist" class="vector-toc-list"> <li id="toc-Removal_of_HABs_using_aluminum-modified_clay" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Removal_of_HABs_using_aluminum-modified_clay"> <div class="vector-toc-text"> 8.2.1 Removal of HABs using aluminum-modified clay </div> </a> <ul id="toc-Removal_of_HABs_using_aluminum-modified_clay-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Additional_reservoirs" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Additional_reservoirs"> <div class="vector-toc-text"> 8.3 Additional reservoirs </div> </a> <ul id="toc-Additional_reservoirs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Restoring_shellfish_populations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Restoring_shellfish_populations"> <div class="vector-toc-text"> 8.4 Restoring shellfish populations </div> </a> <ul id="toc-Restoring_shellfish_populations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Improved_monitoring" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Improved_monitoring"> <div class="vector-toc-text"> 8.5 Improved monitoring </div> </a> <ul id="toc-Improved_monitoring-sublist" class="vector-toc-list"> <li id="toc-Sensors_and_monitoring_devices" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Sensors_and_monitoring_devices"> <div class="vector-toc-text"> 8.5.1 Sensors and monitoring devices </div> </a> <ul id="toc-Sensors_and_monitoring_devices-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Examples" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Examples"> <div class="vector-toc-text"> 9 Examples </div> </a> <button aria-controls="toc-Examples-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Examples subsection </button> <ul id="toc-Examples-sublist" class="vector-toc-list"> <li id="toc-Notable_occurrences" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Notable_occurrences"> <div class="vector-toc-text"> 9.1 Notable occurrences </div> </a> <ul id="toc-Notable_occurrences-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-United_States" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#United_States"> <div class="vector-toc-text"> 9.2 United States </div> </a> <ul id="toc-United_States-sublist" class="vector-toc-list"> <li id="toc-On_the_U.S._coasts" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#On_the_U.S._coasts"> <div class="vector-toc-text"> 9.2.1 On the U.S. coasts </div> </a> <ul id="toc-On_the_U.S._coasts-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Texas" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Texas"> <div class="vector-toc-text"> 9.2.2 Texas </div> </a> <ul id="toc-Texas-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Chesapeake_Bay" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Chesapeake_Bay"> <div class="vector-toc-text"> 9.2.3 Chesapeake Bay </div> </a> <ul id="toc-Chesapeake_Bay-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Lake_Erie" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Lake_Erie"> <div class="vector-toc-text"> 9.2.4 Lake Erie </div> </a> <ul id="toc-Lake_Erie-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Green_Bay" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Green_Bay"> <div class="vector-toc-text"> 9.2.5 Green Bay </div> </a> <ul id="toc-Green_Bay-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Okeechobee_Waterway" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Okeechobee_Waterway"> <div class="vector-toc-text"> 9.2.6 Okeechobee Waterway </div> </a> <ul id="toc-Okeechobee_Waterway-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Baltic_Sea" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Baltic_Sea"> <div class="vector-toc-text"> 9.3 Baltic Sea </div> </a> <ul id="toc-Baltic_Sea-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Coastal_seas_of_Bangladesh,_India,_and_Pakistan" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Coastal_seas_of_Bangladesh,_India,_and_Pakistan"> <div class="vector-toc-text"> 9.4 Coastal seas of Bangladesh, India, and Pakistan </div> </a> <ul id="toc-Coastal_seas_of_Bangladesh,_India,_and_Pakistan-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> 10 See also </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> 11 References </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> 12 External links </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> 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</div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">Harmful algal bloom</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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algâu – Welsh" lang="cy" hreflang="cy" data-title="Gordyfiant niweidiol o algâu" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target">Cymraeg</a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%95%CF%80%CE%B9%CE%B2%CE%BB%CE%B1%CE%B2%CE%AE%CF%82_%CE%AC%CE%BD%CE%B8%CE%B9%CF%83%CE%B7_%CF%86%CF%85%CE%BA%CF%8E%CE%BD" title="Επιβλαβής άνθιση φυκών – Greek" lang="el" hreflang="el" data-title="Επιβλαβής άνθιση φυκών" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target">Ελληνικά</a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B4%DA%A9%D9%88%D9%81%D8%A7%DB%8C%DB%8C_%D8%AC%D9%84%D8%A8%DA%A9%DB%8C_%D8%B2%DB%8C%D8%A7%D9%86%E2%80%8C%D8%A8%D8%A7%D8%B1" title="شکوفایی جلبکی زیان‌بار – Persian" lang="fa" hreflang="fa" data-title="شکوفایی جلبکی زیان‌بار" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target">فارسی</a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Floraci%C3%B3n_de_algas_nocivas" title="Floración de algas nocivas – Galician" lang="gl" hreflang="gl" data-title="Floración de algas nocivas" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target">Galego</a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9C%A0%ED%95%B4%EC%A1%B0%EB%A5%98" title="유해조류 – Korean" lang="ko" hreflang="ko" data-title="유해조류" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target">한국어</a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A6%D1%80%D0%B2%D0%B5%D0%BD%D0%B0_%D0%BF%D0%BB%D0%B8%D0%BC%D0%B0" title="Црвена плима – Macedonian" lang="mk" hreflang="mk" data-title="Црвена плима" 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.hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"Red tide" redirects here. For the athletic programs of the University of Alabama, see <a href="/wiki/Alabama_Crimson_Tide" title="Alabama Crimson Tide">Alabama Crimson Tide</a>.</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Blue-gree_algae_bloom_Lake_Erie.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/Blue-gree_algae_bloom_Lake_Erie.png/220px-Blue-gree_algae_bloom_Lake_Erie.png" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/Blue-gree_algae_bloom_Lake_Erie.png/330px-Blue-gree_algae_bloom_Lake_Erie.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/19/Blue-gree_algae_bloom_Lake_Erie.png/440px-Blue-gree_algae_bloom_Lake_Erie.png 2x" data-file-width="800" data-file-height="600" /></a><figcaption><a href="/wiki/Cyanobacteria" title="Cyanobacteria">Cyanobacteria</a> (blue-green algae) bloom on <a href="/wiki/Lake_Erie" title="Lake Erie">Lake Erie</a> (United States) in 2009. These kinds of algae can cause harmful algal bloom.</figcaption></figure> A harmful algal bloom (HAB), or excessive algae growth, is an <a href="/wiki/Algal_bloom" title="Algal bloom">algal bloom</a> that causes negative impacts to other organisms by production of natural <a href="/wiki/Phycotoxin" title="Phycotoxin">algae-produced toxins</a>, <a href="/wiki/Anoxic_waters" title="Anoxic waters">water deoxygenation</a>, mechanical damage to other organisms, or by other means. HABs are sometimes defined as only those algal blooms that produce toxins, and sometimes as any algal bloom that can result in severely lower <a href="/wiki/Oxygen_saturation" title="Oxygen saturation">oxygen levels</a> in natural waters, killing organisms in <a href="/wiki/Marine_habitats" class="mw-redirect" title="Marine habitats">marine</a> or <a href="/wiki/Fresh_water" title="Fresh water">fresh waters</a>.<a href="#cite_note-:4-1">[1]</a> Blooms can last from a few days to many months. After the bloom dies, the <a href="/wiki/Microorganism" title="Microorganism">microbes</a> that decompose the dead algae use up more of the oxygen, generating a "<a href="/wiki/Dead_zone_(ecology)" title="Dead zone (ecology)">dead zone</a>" which can cause <a href="/wiki/Fish_kill" title="Fish kill">fish die-offs</a>. When these zones cover a large area for an extended period of time, neither fish nor plants are able to survive. Harmful algal blooms in marine environments are often called "red tides".<a href="#cite_note-:62-2">[2]</a><a href="#cite_note-:63-3">[3]</a> It is sometimes unclear what causes specific HABs as their occurrence in some locations appears to be entirely natural,<a href="#cite_note-:2-4">[4]</a> while in others they appear to be a result of human activities.<a href="#cite_note-:3-5">[5]</a> In certain locations there are links to particular drivers like nutrients, but HABs have also been occurring since before humans started to affect the environment. HABs are induced by <a href="/wiki/Eutrophication" title="Eutrophication">eutrophication</a>, which is an <a href="/wiki/Nutrient_pollution" title="Nutrient pollution">overabundance of nutrients</a> in the water. The two most common nutrients are fixed nitrogen (<a href="/wiki/Nitrate" title="Nitrate">nitrates</a>, <a href="/wiki/Ammonia" title="Ammonia">ammonia</a>, and <a href="/wiki/Urea" title="Urea">urea</a>) and <a href="/wiki/Phosphate" title="Phosphate">phosphate</a>.<a href="#cite_note-CDC-6">[6]</a> The excess nutrients are emitted by <a href="/wiki/Agricultural_pollution" title="Agricultural pollution">agriculture</a>, industrial pollution, excessive <a href="/wiki/Fertilizer" title="Fertilizer">fertilizer</a> use in urban/suburban areas, and associated <a href="/wiki/Urban_runoff" title="Urban runoff">urban runoff</a>. Higher water temperature and low circulation also contribute.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] HABs can cause significant harm to animals, the environment and economies. They have been increasing in size and frequency worldwide, a fact that many experts attribute to global <a href="/wiki/Climate_change" title="Climate change">climate change</a>. The U.S. <a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a> (NOAA) predicts more harmful blooms in the <a href="/wiki/Pacific_Ocean" title="Pacific Ocean">Pacific Ocean</a>.<a href="#cite_note-7">[7]</a> Potential remedies include chemical treatment, additional reservoirs, sensors and monitoring devices, reducing nutrient runoff, research and management as well as monitoring and reporting.<a href="#cite_note-8">[8]</a> Terrestrial runoff, containing fertilizer, sewage and livestock wastes, transports abundant nutrients to the seawater and stimulates bloom events. Natural causes, such as river floods or <a href="/wiki/Upwelling" title="Upwelling">upwelling</a> of nutrients from the <a href="/wiki/Sea_floor" class="mw-redirect" title="Sea floor">sea floor</a>, often following massive storms, provide nutrients and trigger bloom events as well. Increasing coastal developments and aquaculture also contribute to the occurrence of coastal HABs.<a href="#cite_note-:62-2">[2]</a><a href="#cite_note-:63-3">[3]</a> Effects of HABs can worsen locally due to wind driven <a href="/wiki/Langmuir_circulation" title="Langmuir circulation">Langmuir circulation</a> and their <a href="/wiki/Langmuir_circulation#Biological_effects" title="Langmuir circulation">biological effects</a>.<style data-mw-deduplicate="TemplateStyles:r886046785">.mw-parser-output .toclimit-2 .toclevel-1 ul,.mw-parser-output .toclimit-3 .toclevel-2 ul,.mw-parser-output .toclimit-4 .toclevel-3 ul,.mw-parser-output .toclimit-5 .toclevel-4 ul,.mw-parser-output .toclimit-6 .toclevel-5 ul,.mw-parser-output .toclimit-7 .toclevel-6 ul{display:none}</style><div class="toclimit-3"><meta property="mw:PageProp/toc" /></div> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist 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href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><td class="sidebar-pretitle">Part of a series on</td></tr><tr><th class="sidebar-title-with-pretitle" style="background:#82C3D8; padding:0.2em; font-size:160%; font-weight:bold;"><a href="/wiki/Plankton" title="Plankton">Plankton</a></th></tr><tr><td class="sidebar-image"><a href="/wiki/File:Mixed_phytoplankton_community_2.png" class="mw-file-description" title="Phytoplankton"><img alt="Phytoplankton" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Mixed_phytoplankton_community_2.png/250px-Mixed_phytoplankton_community_2.png" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Mixed_phytoplankton_community_2.png/375px-Mixed_phytoplankton_community_2.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Mixed_phytoplankton_community_2.png/500px-Mixed_phytoplankton_community_2.png 2x" data-file-width="1280" data-file-height="960" /></a></td></tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)"><a href="/wiki/Plankton#Trophic_groups" title="Plankton">Trophic mode</a></div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Phytoplankton" title="Phytoplankton">Phytoplankton</a></li> <li><a href="/wiki/Zooplankton" title="Zooplankton">Zooplankton</a></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Mixoplankton" class="mw-redirect" title="Mixoplankton">Mixoplankton</a></li> <li><a href="/wiki/Mycoplankton" title="Mycoplankton">Mycoplankton</a></li> <li><a href="/wiki/Bacterioplankton" title="Bacterioplankton">Bacterioplankton</a></li> <li><a href="/wiki/Marine_viruses" title="Marine viruses">Virioplankton</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)"><a href="/wiki/Plankton#Size_groups" title="Plankton">By size</a></div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Heterotrophic_picoplankton" title="Heterotrophic picoplankton">Heterotrophic picoplankton</a></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Microalgae" title="Microalgae">Microalgae</a></li> <li><a href="/wiki/Microzooplankton" class="mw-redirect" title="Microzooplankton">Microzooplankton</a></li> <li><a href="/wiki/Nanophytoplankton" title="Nanophytoplankton">Nanophytoplankton</a> <ul><li><a href="/wiki/Calcareous_nannofossils" title="Calcareous nannofossils">calcareous</a></li></ul></li> <li><a href="/wiki/Photosynthetic_picoplankton" title="Photosynthetic picoplankton">Photosynthetic picoplankton</a></li> <li><a href="/wiki/Picoeukaryote" title="Picoeukaryote">Picoeukaryote</a></li> <li><a href="/wiki/Picoplankton" title="Picoplankton">Picoplankton</a></li> <li><a href="/wiki/Marine_microplankton" class="mw-redirect" title="Marine microplankton">Marine microplankton</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)">By taxonomy</div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Marine_algae" class="mw-redirect" title="Marine algae">Algae</a> <ul><li><a href="/wiki/Diatom" title="Diatom">diatoms</a> </li> <li><a href="/wiki/Coccolithophore" title="Coccolithophore">coccolithophores</a></li> <li><a href="/wiki/Dinoflagellate" title="Dinoflagellate">dinoflagellates</a></li></ul></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Marine_protozoans" class="mw-redirect" title="Marine protozoans">Protozoans</a> <ul><li><a href="/wiki/Radiolaria" title="Radiolaria">radiolarians</a> </li> <li><a href="/wiki/Foraminiferan" class="mw-redirect" title="Foraminiferan">foraminiferans</a></li> <li><a href="/wiki/Amoeba" title="Amoeba">amoebae</a></li> <li><a href="/wiki/Ciliates" class="mw-redirect" title="Ciliates">ciliates</a></li></ul></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Marine_prokaryotes#Marine_bacteria" title="Marine prokaryotes">Bacteria</a> <ul><li><a href="/wiki/Marine_prokaryotes#Cyanobacteria" title="Marine prokaryotes">cyanobacteria</a></li></ul></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Marine_prokaryotes#Marine_archaea" title="Marine prokaryotes">Archaea</a></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Marine_viruses" title="Marine viruses">Viruses</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)">By habitat</div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Aeroplankton" title="Aeroplankton">Aeroplankton</a></li> <li><a href="/wiki/Geoplankton" class="mw-redirect" title="Geoplankton">Geoplankton</a></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Marine_plankton" class="mw-redirect" title="Marine plankton">Marine plankton</a> <ul><li><a href="/wiki/Marine_prokaryotes" title="Marine prokaryotes">prokaryotes</a></li> <li><a href="/wiki/Marine_protists" title="Marine protists">protists</a></li></ul></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Freshwater_plankton" class="mw-redirect" title="Freshwater plankton">Freshwater plankton</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)">Other types</div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Gelatinous_zooplankton" title="Gelatinous zooplankton">Gelatinous zooplankton</a></li> <li><a href="/wiki/Holoplankton" title="Holoplankton">Holoplankton</a></li> <li><a href="/wiki/Ichthyoplankton" title="Ichthyoplankton">Ichthyoplankton</a></li> <li><a href="/wiki/Meroplankton" title="Meroplankton">Meroplankton</a></li> <li><a href="/wiki/Pseudoplankton" title="Pseudoplankton">Pseudoplankton</a></li> <li><a href="/wiki/Tychoplankton" title="Tychoplankton">Tychoplankton</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)"><a href="/wiki/Algal_bloom" title="Algal bloom">Blooms</a></div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Algal_bloom" title="Algal bloom">Algal bloom</a></li> <li><a href="/wiki/Critical_depth" title="Critical depth">Critical depth</a></li> <li><a href="/wiki/Cyanobacterial_bloom" class="mw-redirect" title="Cyanobacterial bloom">Cyanobacterial bloom</a></li> <li><a class="mw-selflink selflink">Harmful algal bloom</a></li> <li><a href="/wiki/Spring_bloom" title="Spring bloom">Spring bloom</a></li> <li><a href="/wiki/Eutrophication" title="Eutrophication">Eutrophication</a></li> <li><a href="/wiki/Great_Atlantic_Sargassum_Belt" title="Great Atlantic Sargassum Belt">Great Atlantic Sargassum Belt</a></li> <li><a href="/wiki/Great_Calcite_Belt" title="Great Calcite Belt">Great Calcite Belt</a></li> <li><a href="/wiki/Milky_seas_effect" title="Milky seas effect">Milky seas effect</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="text-align:center;font-size:100%;font-weight:bold;;color: var(--color-base)">Related topics</div><div class="sidebar-list-content mw-collapsible-content"><div class="hlist"> <ul><li><a href="/wiki/Algaculture" title="Algaculture">Algaculture</a></li> <li><a href="/wiki/CLAW_hypothesis" title="CLAW hypothesis">CLAW hypothesis</a></li> <li><a href="/wiki/Continuous_Plankton_Recorder" title="Continuous Plankton Recorder">CPR</a></li> <li><a href="/wiki/Diel_vertical_migration" title="Diel vertical migration">Diel vertical migration</a></li> <li><a href="/wiki/F-ratio_(oceanography)" title="F-ratio (oceanography)">f-ratio</a></li> <li><a href="/wiki/Marine_primary_production" title="Marine primary production">Marine primary production</a></li></ul> </div> <div class="hlist"> <ul><li><a href="/wiki/Ocean_fertilization" title="Ocean fertilization">Ocean fertilization</a> <ul><li><a href="/wiki/Iron_fertilization" title="Iron fertilization">iron</a></li></ul></li> <li><a href="/wiki/Paradox_of_the_plankton" title="Paradox of the plankton">Paradox of the plankton</a></li> <li><a href="/wiki/Planktivore" title="Planktivore">Planktivore</a></li> <li><a href="/wiki/Planktology" title="Planktology">Planktology</a></li> <li><a href="/wiki/Thin_layers_(oceanography)" title="Thin layers (oceanography)">Thin layers</a></li> <li><a href="/wiki/North_Atlantic_Aerosols_and_Marine_Ecosystems_Study" title="North Atlantic Aerosols and Marine Ecosystems Study">NAAMES</a></li></ul> </div></div></div></td> </tr><tr><td class="sidebar-below hlist" style="background-color: #82C3D8; border-color: #A2B8BF"> <ul><li><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /> <a href="/wiki/Category:Plankton" title="Category:Plankton">Category</a></li></ul></td></tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Plankton_sidebar" title="Template:Plankton sidebar"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Plankton_sidebar" title="Template talk:Plankton sidebar"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Plankton_sidebar" title="Special:EditPage/Template:Plankton sidebar"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Description_and_identification">Description and identification</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=1" title="Edit section: Description and identification">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Banter_See_1348.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Banter_See_1348.jpg/220px-Banter_See_1348.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Banter_See_1348.jpg/330px-Banter_See_1348.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/68/Banter_See_1348.jpg/440px-Banter_See_1348.jpg 2x" data-file-width="3264" data-file-height="2448" /></a><figcaption><a href="/wiki/Cyanobacteria" title="Cyanobacteria">Cyanobacteria</a> algae on the coast of northern Germany</figcaption></figure> HABs from <a href="/wiki/Cyanobacteria" title="Cyanobacteria">cyanobacteria</a> (blue-green algae) can appear as a foam, scum, or mat on or just below the surface of water and can take on various colors depending on their pigments.<a href="#cite_note-CDC-6">[6]</a> Cyanobacteria blooms in freshwater lakes or rivers may appear bright green, often with surface streaks that look like floating paint.<a href="#cite_note-California-9">[9]</a> Cyanobacterial blooms are a global problem.<a href="#cite_note-10">[10]</a> Most blooms occur in warm waters with excessive nutrients.<a href="#cite_note-CDC-6">[6]</a> The harmful effects from such blooms are due to the toxins they produce or from using up oxygen in the water which can lead to fish die-offs.<a href="#cite_note-usatoday-11">[11]</a> Not all <a href="/wiki/Algal_bloom" title="Algal bloom">algal blooms</a> produce toxins, however, with some only discoloring water, producing a smelly odor, or adding a bad taste to the water. Unfortunately, it is not possible to tell if a bloom is harmful from just appearances, since sampling and microscopic examination is required.<a href="#cite_note-CDC-6">[6]</a> In many cases microscopy is not sufficient to tell the difference between toxic and non-toxic populations. In these cases, tools can be employed to measure the toxin level or to determine if the toxin-production genes are present.<a href="#cite_note-12">[12]</a> <div class="mw-heading mw-heading2"><h2 id="Terminology">Terminology</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=2" title="Edit section: Terminology">edit</a>]</div> In a narrow definition, harmful algal blooms are only those blooms that release toxins that affect other species. On the other hand, any algal bloom can cause dead zones due to <a href="/wiki/Hypoxia_(environmental)" title="Hypoxia (environmental)">low oxygen levels</a>, and could therefore be called "harmful" in that sense. The usage of the term "harmful algal blooms" in the media and scientific literature is varied. In a broader definition, all "organisms and events are considered to be HABs if they negatively impact human health or socioeconomic interests or are detrimental to aquatic systems".<a href="#cite_note-Kudela_2017-13">[13]</a> A harmful algal bloom is "a societal concept rather than a scientific definition".<a href="#cite_note-Kudela_2017-13">[13]</a> A similarly broad definition of HABs was adopted by the <a href="/wiki/United_States_Environmental_Protection_Agency" title="United States Environmental Protection Agency">US Environmental Protection Agency</a> in 2008 who stated that HABs include "potentially toxic (auxotrophic, heterotrophic) species and high-biomass producers that can cause hypoxia and anoxia and indiscriminate mortalities of marine life after reaching dense concentrations, whether or not toxins are produced".<a href="#cite_note-:4-1">[1]</a> <div class="mw-heading mw-heading3"><h3 id="Red_tide">Red tide</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=3" title="Edit section: Red tide">edit</a>]</div> Harmful algal bloom in coastal areas are also often referred to as "red tides".<a href="#cite_note-Kudela_2017-13">[13]</a> The term "red tide" is derived from blooms of any of several species of <a href="/wiki/Dinoflagellate" title="Dinoflagellate">dinoflagellate</a>, such as <a href="/wiki/Karenia_brevis" title="Karenia brevis">Karenia brevis</a>.<a href="#cite_note-14">[14]</a> However, the term is misleading since algal blooms can widely vary in color, and growth of algae is unrelated to the <a href="/wiki/Tide" title="Tide">tides</a>. Not all red tides are produced by dinoflagellates. The <a href="/wiki/Mixotrophic" class="mw-redirect" title="Mixotrophic">mixotrophic</a> ciliate <a href="/wiki/Mesodinium_rubrum" title="Mesodinium rubrum">Mesodinium rubrum</a> produces non-toxic blooms coloured deep red by chloroplasts it obtains from the algae it eats. <a href="#cite_note-15">[15]</a> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Karenia_brevis_Anatomy_(1).png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Karenia_brevis_Anatomy_%281%29.png/220px-Karenia_brevis_Anatomy_%281%29.png" decoding="async" width="220" height="109" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Karenia_brevis_Anatomy_%281%29.png/330px-Karenia_brevis_Anatomy_%281%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Karenia_brevis_Anatomy_%281%29.png/440px-Karenia_brevis_Anatomy_%281%29.png 2x" data-file-width="844" data-file-height="418" /></a><figcaption>The dinoflagellate labeled above is the microscopic alga <a href="/wiki/Karenia_brevis" title="Karenia brevis">Karenia brevis</a>. It is the cause of a HAB event in the Gulf of Mexico. The algae propel themselves using a longitudinal flagellum (A) and a transverse flagellum (B). The longitudinal flagellum lies in a groove-like structure called the cingulum (F). The <a href="/wiki/Dinoflagellate" title="Dinoflagellate">dinoflagellate</a> is separated into an upper portion called the epitheca (C) where the apical horn resides (E) and a lower portion called the hypotheca (D).</figcaption></figure> As a technical term, it is being replaced in favor of more precise terminology, including the generic term "harmful algal bloom" for harmful species, and "<a href="/wiki/Algal_bloom" title="Algal bloom">algal bloom</a>" for benign species.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] <div class="mw-heading mw-heading2"><h2 id="Types">Types</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=4" title="Edit section: Types">edit</a>]</div> There are three main types of phytoplankton which can form into harmful algal blooms: <a href="/wiki/Cyanobacteria" title="Cyanobacteria">cyanobacteria</a>, <a href="/wiki/Dinoflagellates" class="mw-redirect" title="Dinoflagellates">dinoflagellates</a>, and <a href="/wiki/Diatoms" class="mw-redirect" title="Diatoms">diatoms</a>. All three are made up of microscopic floating organisms which, like plants, can create their own food from sunlight by means of <a href="/wiki/Photosynthesis" title="Photosynthesis">photosynthesis</a>. That ability makes the majority of them an essential part of the <a href="/wiki/Food_web" title="Food web">food web</a> for small fish and other organisms.<a href="#cite_note-Black-16">[16]</a>: 246  <div class="mw-heading mw-heading3"><h3 id="Cyanobacteria">Cyanobacteria</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=5" title="Edit section: Cyanobacteria">edit</a>]</div> Harmful algal blooms in freshwater lakes and rivers, or at <a href="/wiki/Estuaries" class="mw-redirect" title="Estuaries">estuaries</a>, where rivers flow into the ocean, are caused by cyanobacteria, which are commonly referred to as "blue-green algae",<a href="#cite_note-Peebles-17">[17]</a> but are in fact <a href="/wiki/Prokaryote" title="Prokaryote">prokaryotic</a> bacteria,<a href="#cite_note-18">[18]</a> as opposed to algae which are <a href="/wiki/Eukaryote" title="Eukaryote">eukaryotes</a>.<a href="#cite_note-19">[19]</a> Some cyanobacteria, including the widespread genus <a href="/wiki/Microcystis" title="Microcystis">Microsystis</a>, can produce hazardous cyanotoxins such as <a href="/wiki/Microcystins" class="mw-redirect" title="Microcystins">microcystins</a>,<a href="#cite_note-NOAA-20">[20]</a> which are <a href="/wiki/Hepatotoxins" class="mw-redirect" title="Hepatotoxins">hepatotoxins</a> that harm the liver of mammals.<a href="#cite_note-Utah-21">[21]</a> Other types of cyanobacteria can also produce hepatotoxins, as well as neurotoxins, cytotoxins, and endotoxins.<a href="#cite_note-22">[22]</a> <a href="/wiki/Water_purification" title="Water purification">Water purification</a> plants may be unable to remove these toxins, leading to increasingly common localised advisories against drinking tap water, as happened in Toledo, Ohio in August 2014.<a href="#cite_note-Toledo-23">[23]</a> In August 2021, there were 47 lakes confirmed to have algal blooms in New York State alone.<a href="#cite_note-24">[24]</a><a href="#cite_note-25">[25]</a> In September 2021, Spokane County's Environmental Programs issued a HAB alert for Newman Lake following tests showing potentially harmful toxicity levels for cyanobacteria,<a href="#cite_note-26">[26]</a> while in the same month record-high levels of microcystins were reported leading to an extended 'Do Not Drink' advisory for 280 households at <a href="/wiki/Clear_Lake_(California)" title="Clear Lake (California)">Clear Lake</a>, California's second-largest freshwater lake.<a href="#cite_note-27">[27]</a> Water conditions in Florida, meanwhile, continue to deteriorate under increasing nutrient inflows, causing severe HAB events in both freshwater and marine areas.<a href="#cite_note-28">[28]</a> HABs also cause harm by blocking the sunlight used by plants and algae to photosynthesise, or by depleting the dissolved oxygen needed by fish and other aquatic animals, which can lead to fish die-offs.<a href="#cite_note-usatoday-11">[11]</a> When such oxygen-depleted water covers a large area for an extended period of time, it can become <a href="/wiki/Hypoxia_(environmental)" title="Hypoxia (environmental)">hypoxic</a> or even anoxic; these areas are commonly called <a href="/wiki/Dead_zone_(ecology)" title="Dead zone (ecology)">dead zones</a>. These dead zones can be the result of numerous different factors ranging from natural phenomenon to deliberate human intervention, and are not just limited to large bodies of fresh water as found in the great lakes, but are also prone to bodies of salt water as well.<a href="#cite_note-29">[29]</a> <div class="mw-heading mw-heading3"><h3 id="Dual-stage_life_systems_of_algal_species">Dual-stage life systems of algal species</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=6" title="Edit section: Dual-stage life systems of algal species">edit</a>]</div> Many of the species that form harmful algae blooms will undergo a dual-stage life system. These species will alternate between a <a href="/wiki/Benthic_zone" title="Benthic zone">benthic</a> resting stage and a <a href="/wiki/Pelagic_zone" title="Pelagic zone">pelagic</a> vegetative state. The benthic resting stage corresponds to when these species are resting near the ocean floor. In this stage, the species cells are waiting for optimal conditions so that they can move towards the surface. These species will then transition from the benthic resting stage into the pelagic vegetative state - where they are more active and found near the water body surface. In the pelagic vegetative state, these cells are able to grow and multiply. It is within the pelagic vegetative state that a bloom is able to occur - as the cells rapidly reproduce and take over the upper regions of the body of water. The transition between these two life stages can have multiple effects on the algae bloom (such as rapid termination of the HAB as cells convert from the pelagic state to the benthic state). Many of the algal species that undergo this dual-stage life cycle are capable of rapid vertical migration. This migration is required for the movement from the benthic area of bodies of water to the pelagic zone. These species require immense amounts of energy as they pass through the various <a href="/wiki/Thermocline" title="Thermocline">thermoclines</a>, <a href="/wiki/Halocline" title="Halocline">haloclines</a>, and <a href="/wiki/Pycnocline" title="Pycnocline">pycnoclines</a> that are associated with the bodies of water in which these cells exist.<a href="#cite_note-30">[30]</a> <div class="mw-heading mw-heading3"><h3 id="Diatoms_and_dinoflagellates_(in_marine_coastal_areas)">Diatoms and dinoflagellates (in marine coastal areas)</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=7" title="Edit section: Diatoms and dinoflagellates (in marine coastal areas)">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:La-Jolla-Red-Tide.780.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/La-Jolla-Red-Tide.780.jpg/220px-La-Jolla-Red-Tide.780.jpg" decoding="async" width="220" height="155" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/La-Jolla-Red-Tide.780.jpg/330px-La-Jolla-Red-Tide.780.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/96/La-Jolla-Red-Tide.780.jpg/440px-La-Jolla-Red-Tide.780.jpg 2x" data-file-width="780" data-file-height="548" /></a><figcaption>A harmful algal bloom event off the coast of <a href="/wiki/San_Diego,_California" class="mw-redirect" title="San Diego, California">San Diego, California</a></figcaption></figure>The other types of algae are <a href="/wiki/Diatom" title="Diatom">diatoms</a> and <a href="/wiki/Dinoflagellate" title="Dinoflagellate">dinoflagellates</a>, found primarily in marine environments, such as ocean coastlines or bays, where they can also form algal blooms. Coastal HABs are a natural phenomenon,<a href="#cite_note-Red-31">[31]</a><a href="#cite_note-32">[32]</a> although in many instances, particularly when they form close to coastlines or in estuaries, it has been shown that they are exacerbated by human-induced <a href="/wiki/Eutrophication" title="Eutrophication">eutrophication</a> and / or climate change.<a href="#cite_note-33">[33]</a><a href="#cite_note-34">[34]</a><a href="#cite_note-35">[35]</a><a href="#cite_note-36">[36]</a> They can occur when warmer water, salinity, and nutrients reach certain levels, which then stimulates their growth.<a href="#cite_note-Red-31">[31]</a> Most HAB algae are dinoflagellates.<a href="#cite_note-monterey-37">[37]</a> They are visible in water at a concentration of 1,000 algae cells/ml, while in dense blooms they can measure over 200,000/ml.<a href="#cite_note-38">[38]</a> Diatoms produce <a href="/wiki/Domoic_acid" title="Domoic acid">domoic acid</a>, another neurotoxin, which can cause seizures in higher vertebrates and birds as it concentrates up the food chain. Domoic acid readily accumulates in the bodies of <a href="/wiki/Shellfish" title="Shellfish">shellfish</a>, <a href="/wiki/Sardines" class="mw-redirect" title="Sardines">sardines</a>, and <a href="/wiki/Anchovies" class="mw-redirect" title="Anchovies">anchovies</a>, which if then eaten by <a href="/wiki/Sea_lions" class="mw-redirect" title="Sea lions">sea lions</a>, <a href="/wiki/Otters" class="mw-redirect" title="Otters">otters</a>, <a href="/wiki/Cetaceans" class="mw-redirect" title="Cetaceans">cetaceans</a>, birds or people, can affect the nervous system causing serious injury or death.<a href="#cite_note-marine-39">[39]</a> In the summer of 2015, the state governments closed important shellfish fisheries in <a href="/wiki/Washington_(state)" title="Washington (state)">Washington</a>, <a href="/wiki/Oregon" title="Oregon">Oregon</a>, and <a href="/wiki/California" title="California">California</a> because of high concentrations of domoic acid in shellfish.<a href="#cite_note-shellfish-40">[40]</a> In the marine environment, single-celled, microscopic, plant-like organisms naturally occur in the well-lit surface layer of any body of water. These organisms, referred to as <a href="/wiki/Phytoplankton" title="Phytoplankton">phytoplankton</a> or <a href="/wiki/Microalgae" title="Microalgae">microalgae</a>, form the base of the food web upon which nearly all other marine organisms depend. Of the 5000+ species of marine phytoplankton that exist worldwide, about 2% are known to be harmful or toxic.<a href="#cite_note-41">[41]</a> Blooms of harmful algae can have large and varied impacts on marine ecosystems, depending on the species involved, the environment where they are found, and the mechanism by which they exert negative effects.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] <div class="mw-heading mw-heading2"><h2 id="List_of_common_HAB_genera">List of common HAB genera</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=8" title="Edit section: List of common HAB genera">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col"> <ul><li><a href="/wiki/Gonyaulax" title="Gonyaulax">Gonyaulax</a></li> <li><a href="/wiki/Karenia_(dinoflagellate)" title="Karenia (dinoflagellate)">Karenia</a></li> <li><a href="/wiki/Gymnodinium" title="Gymnodinium">Gymnodinium</a></li> <li><a href="/wiki/Dinophysis" title="Dinophysis">Dinophysis</a></li> <li><a href="/wiki/Noctiluca" class="mw-redirect" title="Noctiluca">Noctiluca</a></li> <li><a href="/wiki/Chattonella" title="Chattonella">Chattonella</a></li> <li><a href="/wiki/Ceratium" title="Ceratium">Ceratium</a></li> <li><a href="/wiki/Amoebophyra" title="Amoebophyra">Amoebophyra</a></li> <li><a href="/wiki/Alexandrium_(dinoflagellate)" title="Alexandrium (dinoflagellate)">Alexandrium</a></li> <li><a href="/wiki/Cochlodinium" title="Cochlodinium">Cochlodinium</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="Causes">Causes</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=9" title="Edit section: Causes">edit</a>]</div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Nonvisible_cyanobacteria_HAB.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Nonvisible_cyanobacteria_HAB.png/300px-Nonvisible_cyanobacteria_HAB.png" decoding="async" width="300" height="197" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Nonvisible_cyanobacteria_HAB.png/450px-Nonvisible_cyanobacteria_HAB.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Nonvisible_cyanobacteria_HAB.png/600px-Nonvisible_cyanobacteria_HAB.png 2x" data-file-width="797" data-file-height="523" /></a><figcaption> Harmful algal blooms do not have to be clearly visible. This shows a bloom with high cyanobacteria toxin levels (over 5 μ/l) yet the bloom is not easy to see.<a href="#cite_note-42">[42]</a></figcaption></figure> It is sometimes unclear what causes specific HABs as their occurrence in some locations appears to be entirely natural,<a href="#cite_note-:2-4">[4]</a> while in others they appear to be a result of human activities.<a href="#cite_note-:3-5">[5]</a> Furthermore, there are many different species of algae that can form HABs, each with different environmental requirements for optimal growth. The frequency and severity of HABs in some parts of the world have been linked to increased nutrient loading from human activities. In other areas, HABs are a predictable seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents.<a href="#cite_note-43">[43]</a> The growth of marine phytoplankton (both non-toxic and toxic) is generally limited by the availability of nitrates and phosphates, which can be abundant in coastal upwelling zones as well as in agricultural run-off. The type of nitrates and phosphates available in the system are also a factor, since phytoplankton can grow at different rates depending on the relative abundance of these substances (e.g. <a href="/wiki/Ammonia" title="Ammonia">ammonia</a>, <a href="/wiki/Urea" title="Urea">urea</a>, nitrate ion).<a href="#cite_note-Moore-44">[44]</a> A variety of other nutrient sources can also play an important role in affecting algal bloom formation, including iron, silica or carbon. Coastal <a href="/wiki/Water_pollution" title="Water pollution">water pollution</a> produced by humans (including iron fertilization) and systematic increase in <a href="/wiki/Global_warming" class="mw-redirect" title="Global warming">sea water temperature</a> have also been suggested as possible contributing factors in HABs.<a href="#cite_note-Moore-44">[44]</a> Among the causes of algal blooms are:<a href="#cite_note-Janssen-et-al-2019-45">[45]</a> <ul><li>Excess nutrients—<a href="/wiki/Phosphorus" title="Phosphorus">phosphorus</a> and <a href="/wiki/Nitrates" class="mw-redirect" title="Nitrates">nitrates</a>—from fertilizers or <a href="/wiki/Sewage" title="Sewage">sewage</a> that are discharged to water bodies (also called <a href="/wiki/Nutrient_pollution" title="Nutrient pollution">nutrient pollution</a>)<a href="#cite_note-EPA-Climate-46">[46]</a><a href="#cite_note-Peebles-17">[17]</a><a href="#cite_note-:0-47">[47]</a></li> <li><a href="/wiki/Climate_change" title="Climate change">climate change</a><a href="#cite_note-EPA-Climate-46">[46]</a></li> <li><a href="/wiki/Thermal_pollution" title="Thermal pollution">thermal pollution</a> from power plants and factories</li> <li>low water levels in inland waterways and lakes, which reduces water flow and increases water temperatures<a href="#cite_note-Utah-21">[21]</a><a href="#cite_note-Russian-48">[48]</a></li> <li>invasive filter feeders—especially <a href="/wiki/Zebra_mussel" title="Zebra mussel">Zebra mussels</a>, Dreissena polymorpha—which preferentially eat non-toxic algae, competitors to harmful algae<a href="#cite_note-Harke-et-al-2016-49">[49]</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Nutrients">Nutrients</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=10" title="Edit section: Nutrients">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Eutrophication" title="Eutrophication">Eutrophication</a></div> Nutrients enter freshwater or marine environments as <a href="/wiki/Surface_runoff" title="Surface runoff">surface runoff</a> from <a href="/wiki/Agricultural_pollution" title="Agricultural pollution">agricultural pollution</a> and <a href="/wiki/Urban_runoff" title="Urban runoff">urban runoff</a> from fertilized lawns, golf courses and other landscaped properties; and from <a href="/wiki/Sewage_treatment_plants" class="mw-redirect" title="Sewage treatment plants">sewage treatment plants</a> that lack nutrient control systems.<a href="#cite_note-EPA-sources-50">[50]</a> Additional nutrients are introduced from atmospheric pollution.<a href="#cite_note-Miller-51">[51]</a> Coastal areas worldwide, especially wetlands and estuaries, coral reefs and swamps, are prone to being overloaded with those nutrients.<a href="#cite_note-Miller-51">[51]</a> Most of the large cities along the <a href="/wiki/Mediterranean_Sea" title="Mediterranean Sea">Mediterranean Sea</a>, for example, discharge all of their sewage into the sea untreated.<a href="#cite_note-Miller-51">[51]</a> The same is true for most coastal developing countries, while in parts of the developing world, as much as 70% of wastewater from large cities may re-enter water systems without being treated.<a href="#cite_note-52">[52]</a> Residual nutrients in treated wastewater can also accumulate in downstream source water areas<a href="#cite_note-53">[53]</a> and fuel eutrophication, which leads progressively to a cyanobacteria-dominated system characterized by seasonal HABs. As more wastewater treatment infrastructure is built, more treated wastewater is returned to the natural water system, leading to a significant increase in these residual nutrients.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] Residual nutrients combine with nutrients from other sources to increase the sediment nutrient stockpile that is the driving force behind phase shifts to entrenched eutrophic conditions.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] This contributes to the ongoing degradation of dams, lakes, rivers, and reservoirs - source water areas that are starting to become known as ecological infrastructure,<a href="#cite_note-54">[54]</a> placing increasing pressure on wastewater treatment works and water purification plants. Such pressures, in turn, intensify seasonal HABs.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] <div class="mw-heading mw-heading3"><h3 id="Climate_change">Climate change</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=11" title="Edit section: Climate change">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Effects_of_climate_change_on_oceans" title="Effects of climate change on oceans">Effects of climate change on oceans</a></div> <a href="/wiki/Climate_change" title="Climate change">Climate change</a> contributes to warmer waters which makes conditions more favorable for algae growth in more regions and farther north.<a href="#cite_note-55">[55]</a><a href="#cite_note-EPA-Climate-46">[46]</a> In general, still, warm, shallow water, combined with high-nutrient conditions in lakes or rivers, increases the risk of harmful algal blooms.<a href="#cite_note-Russian-48">[48]</a> Warming of summer surface temperatures of lakes, which rose by 0.34 °C decade per decade between 1985 and 2009 due to global warming, also will likely increase algal blooming by 20% over the next century.<a href="#cite_note-56">[56]</a> Although the drivers of harmful algal blooms are poorly understood, they do appear to have increased in range expansion and frequency in coastal areas since the 1980s.<a href="#cite_note-SROCC_SPM_20190925-57">[57]</a>: 16  The is the result of human induced factors such as increased nutrient inputs (<a href="/wiki/Nutrient_pollution" title="Nutrient pollution">nutrient pollution</a>) and climate change (in particular the warming of water temperatures).<a href="#cite_note-SROCC_SPM_20190925-57">[57]</a>: 16  The parameters that affect the formation of HABs are <a href="/wiki/Ocean_warming" class="mw-redirect" title="Ocean warming">ocean warming</a>, marine heatwaves, <a href="/wiki/Ocean_deoxygenation" title="Ocean deoxygenation">oxygen loss</a>, eutrophication and <a href="/wiki/Water_pollution" title="Water pollution">water pollution</a>.<a href="#cite_note-58">[58]</a>: 582  <div class="mw-heading mw-heading3"><h3 id="Causes_or_contributing_factors_of_coastal_HABs">Causes or contributing factors of coastal HABs</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=12" title="Edit section: Causes or contributing factors of coastal HABs">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Red_tide.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Red_tide.jpg/220px-Red_tide.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Red_tide.jpg/330px-Red_tide.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/65/Red_tide.jpg/440px-Red_tide.jpg 2x" data-file-width="563" data-file-height="422" /></a><figcaption>Coastal harmful algal bloom event.</figcaption></figure>HABs contain dense concentrations of organisms and appear as discolored water, often reddish-brown in color. It is a natural phenomenon, but the exact cause or combination of factors that result in a HAB event are not necessarily known.<a href="#cite_note-Tx_pwd-59">[59]</a> However, three key natural factors are thought to play an important role in a bloom - salinity, temperature, and wind. HABs cause economic harm, so outbreaks are carefully monitored. For example, the <a href="/wiki/Florida_Fish_and_Wildlife_Conservation_Commission" title="Florida Fish and Wildlife Conservation Commission">Florida Fish and Wildlife Conservation Commission</a> provides an up-to-date status report on HABs in Florida.<a href="#cite_note-60">[60]</a> The <a href="/wiki/Texas_Parks_and_Wildlife_Department" title="Texas Parks and Wildlife Department">Texas Parks and Wildlife Department</a> also provides a status report.<a href="#cite_note-61">[61]</a> While no particular cause of HABs has been found, many different factors can contribute to their presence. These factors can include <a href="/wiki/Water_pollution" title="Water pollution">water pollution</a>, which originates from sources such as human <a href="/wiki/Sewage" title="Sewage">sewage</a> and <a href="/wiki/Agricultural_pollution" title="Agricultural pollution">agricultural runoff</a>.<a href="#cite_note-West,_L._2016-62">[62]</a> The occurrence of HABs in some locations appears to be entirely natural (algal blooms are a seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents)<a href="#cite_note-63">[63]</a><a href="#cite_note-64">[64]</a> while in others they appear to be a result of increased <a href="/wiki/Nutrient_pollution" title="Nutrient pollution">nutrient pollution</a> from human activities.<a href="#cite_note-65">[65]</a> The growth of marine phytoplankton is generally limited by the availability of <a href="/wiki/Nitrates" class="mw-redirect" title="Nitrates">nitrates</a> and <a href="/wiki/Phosphates" class="mw-redirect" title="Phosphates">phosphates</a>, which can be abundant in agricultural run-off as well as coastal upwelling zones. Other factors such as iron-rich dust influx from large desert areas such as the Sahara Desert are thought to play a major role in causing HAB events.<a href="#cite_note-66">[66]</a> Some algal blooms on the Pacific Coast have also been linked to occurrences of large-scale climatic oscillations such as <a href="/wiki/El_Ni%C3%B1o" class="mw-redirect" title="El Niño">El Niño</a> events.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] <div class="mw-heading mw-heading3"><h3 id="Other_causes">Other causes</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=13" title="Edit section: Other causes">edit</a>]</div> Other factors such as iron-rich dust influx from large desert areas such as the <a href="/wiki/Sahara" title="Sahara">Sahara</a> are thought to play a role in causing HABs.<a href="#cite_note-67">[67]</a> Some algal blooms on the <a href="/wiki/Pacific_coast" title="Pacific coast">Pacific coast</a> have also been linked to natural occurrences of large-scale climatic oscillations such as <a href="/wiki/El_Ni%C3%B1o" class="mw-redirect" title="El Niño">El Niño</a> events. HABs are also linked to heavy rainfall.<a href="#cite_note-Morse_1006–10252-68">[68]</a> Although HABs in the Gulf of Mexico were witnessed in the early 1500s by explorer <a href="/wiki/Cabeza_de_Vaca" class="mw-redirect" title="Cabeza de Vaca">Cabeza de Vaca</a>,<a href="#cite_note-69">[69]</a> it is unclear what initiates these blooms and how large a role n<a href="/wiki/Human_impact_on_the_environment" title="Human impact on the environment">anthropogenic</a> and natural factors play in their development.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] <div class="mw-heading mw-heading2"><h2 id="Number_and_sizes">Number and sizes</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=14" title="Edit section: Number and sizes">edit</a>]</div> The number of reported harmful algal blooms (cyanobacterial) has been increasing throughout the world.<a href="#cite_note-usgs2-70">[70]</a> It is unclear whether the apparent increase in frequency and severity of HABs in various parts of the world is in fact a real increase or is due to increased observation effort and advances in species identification technology.<a href="#cite_note-71">[71]</a><a href="#cite_note-72">[72]</a> In 2008, the U.S. government prepared a report on the problem, "Harmful Algal Bloom Management and Response: Assessment and Plan".<a href="#cite_note-US-73">[73]</a> The report recognized the seriousness of the problem: <style data-mw-deduplicate="TemplateStyles:r1244412712">.mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 32px}.mw-parser-output .templatequotecite{line-height:1.5em;text-align:left;margin-top:0}@media(min-width:500px){.mw-parser-output .templatequotecite{padding-left:1.6em}}</style><blockquote class="templatequote">It is widely believed that the frequency and geographic distribution of HABs have been increasing worldwide. All U.S. coastal states have experienced HABs over the last decade, and new species have emerged in some locations that were not previously known to cause problems. HAB frequency is also thought to be increasing in freshwater systems.<a href="#cite_note-US-73">[73]</a></blockquote> Researchers have reported the growth of HABs in Europe, Africa and Australia. Those have included blooms on some of the <a href="/wiki/African_Great_Lakes" title="African Great Lakes">African Great Lakes</a>, such as <a href="/wiki/Lake_Victoria" title="Lake Victoria">Lake Victoria</a>, the second largest freshwater lake in the world.<a href="#cite_note-Circle-74">[74]</a> <a href="/wiki/India" title="India">India</a> has been reporting an increase in the number of blooms each year.<a href="#cite_note-75">[75]</a> In 1977 <a href="/wiki/Hong_Kong" title="Hong Kong">Hong Kong</a> reported its first coastal HAB. By 1987 they were getting an average of 35 per year.<a href="#cite_note-Brown-76">[76]</a> Additionally, there have been reports of harmful algal blooms throughout popular Canadian lakes such as Beaver Lake and Quamichan Lake. These blooms were responsible for the deaths of a few animals and led to swimming advisories.<a href="#cite_note-77">[77]</a> Global warming and pollution is causing algal blooms to form in places previously considered "impossible" or rare for them to exist, such as under the ice sheets in the <a href="/wiki/Arctic" title="Arctic">Arctic</a>,<a href="#cite_note-78">[78]</a> in <a href="/wiki/Antarctica" title="Antarctica">Antarctica</a>,<a href="#cite_note-79">[79]</a> the <a href="/wiki/Himalayan_Mountains" class="mw-redirect" title="Himalayan Mountains">Himalayan Mountains</a>,<a href="#cite_note-80">[80]</a> the <a href="/wiki/Rocky_Mountains" title="Rocky Mountains">Rocky Mountains</a>,<a href="#cite_note-81">[81]</a> and in the <a href="/wiki/Sierra_Nevada_(U.S.)" class="mw-redirect" title="Sierra Nevada (U.S.)">Sierra Nevada Mountains</a>.<a href="#cite_note-82">[82]</a> In the U.S., every coastal state has had harmful algal blooms over the last decade and new species have emerged in new locations that were not previously known to have caused problems. Inland, major rivers have seen an increase in their size and frequency. In 2015 the <a href="/wiki/Ohio_River" title="Ohio River">Ohio River</a> had a bloom which stretched an "unprecedented" 650 miles (1,050 km) into adjoining states and tested positive for toxins, which created drinking water and recreation problems.<a href="#cite_note-83">[83]</a> A portion of Utah's <a href="/wiki/Jordan_River_(Utah)" title="Jordan River (Utah)">Jordan River</a> was closed due to toxic algal bloom in 2016.<a href="#cite_note-Utah2-84">[84]</a> Off the west coast of <a href="/wiki/South_Africa" title="South Africa">South Africa</a>, HABs caused by <a href="/w/index.php?title=Alexandrium_catanella&action=edit&redlink=1" class="new" title="Alexandrium catanella (page does not exist)">Alexandrium catanella</a> occur every spring. These blooms of organisms cause severe disruptions in <a href="/wiki/Fishery" title="Fishery">fisheries</a> of these waters as the toxins in the phytoplankton cause filter-feeding <a href="/wiki/Shellfish" title="Shellfish">shellfish</a> in affected waters to become poisonous for human consumption.<a href="#cite_note-85">[85]</a> <div class="mw-heading mw-heading2"><h2 id="Harmful_effects">Harmful effects</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=15" title="Edit section: Harmful effects">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Eutrophication#Effects" title="Eutrophication">Eutrophication § Effects</a></div> As algal blooms grow, they deplete the oxygen in the water and block sunlight from reaching fish and plants. Such blooms can last from a few days to many months.<a href="#cite_note-Utah2-84">[84]</a> With less light, plants beneath the bloom can die and fish can starve. Furthermore, the dense population of a bloom reduces oxygen saturation during the night by respiration. And when the algae eventually die off, the microbes which decompose the dead algae use up even more oxygen, which in turn causes more fish to die or leave the area. When oxygen continues to be depleted by blooms it can lead to <a href="/wiki/Hypoxia_(environmental)" title="Hypoxia (environmental)">hypoxic</a> <a href="/wiki/Dead_zone_(ecology)" title="Dead zone (ecology)">dead zones</a>, where neither fish nor plants are able to survive.<a href="#cite_note-86">[86]</a> These dead zones in the case of the Chesapeake Bay, where they are a normal occurrence, are also suspected of being a major source of <a href="/wiki/Methane" title="Methane">methane</a>.<a href="#cite_note-87">[87]</a> Scientists have found that HABs were a prominent feature of previous mass <a href="/wiki/Extinction_event" title="Extinction event">extinction events</a>, including the <a href="/wiki/Permian%E2%80%93Triassic_extinction_event" title="Permian–Triassic extinction event">End-Permian Extinction</a>.<a href="#cite_note-88">[88]</a> <div class="mw-heading mw-heading3"><h3 id="Human_health">Human health</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=16" title="Edit section: Human health">edit</a>]</div> Tests have shown some toxins near blooms can be in the air and thereby be inhaled, which could affect health.<a href="#cite_note-89">[89]</a> <div class="mw-heading mw-heading4"><h4 id="Food">Food</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=17" title="Edit section: Food">edit</a>]</div> Eating fish or shellfish from lakes with a bloom nearby is not recommended.<a href="#cite_note-California-9">[9]</a> Potent toxins are accumulated in shellfish that feed on the algae. If the shellfish are consumed, various types of poisoning may result. These include <a href="/wiki/Amnesic_shellfish_poisoning" title="Amnesic shellfish poisoning">amnesic shellfish poisoning</a> (ASP), <a href="/wiki/Diarrhetic_shellfish_poisoning" class="mw-redirect" title="Diarrhetic shellfish poisoning">diarrhetic shellfish poisoning</a>, <a href="/wiki/Neurotoxic_shellfish_poisoning" title="Neurotoxic shellfish poisoning">neurotoxic shellfish poisoning</a>, and <a href="/wiki/Paralytic_shellfish_poisoning" title="Paralytic shellfish poisoning">paralytic shellfish poisoning</a>.<a href="#cite_note-:02-90">[90]</a> A 2002 study has shown that algal toxins may be the cause for as many as 60,000 intoxication cases in the world each year.<a href="#cite_note-:02-90">[90]</a> In 1987 a new illness emerged: <a href="/wiki/Amnesic_shellfish_poisoning" title="Amnesic shellfish poisoning">amnesic shellfish poisoning</a> (ASP). People who had eaten <a href="/wiki/Mussel" title="Mussel">mussels</a> from <a href="/wiki/Prince_Edward_Island" title="Prince Edward Island">Prince Edward Island</a> were found to have ASP. The illness was caused by <a href="/wiki/Domoic_acid" title="Domoic acid">domoic acid</a>, produced by a diatom found in the area where the mussels were cultivated.<a href="#cite_note-91">[91]</a> A 2013 study found that toxic <a href="/wiki/Paralytic_shellfish_poisoning" title="Paralytic shellfish poisoning">paralytic shellfish poisoning</a> in the <a href="/wiki/Philippines" title="Philippines">Philippines</a> during HABs has caused at least 120 deaths over a few decades.<a href="#cite_note-92">[92]</a> After a 2014 HAB incident in <a href="/wiki/Monterey_Bay" title="Monterey Bay">Monterey Bay</a>, California, health officials warned people not to eat certain parts of anchovy, sardines, or crab caught in the bay.<a href="#cite_note-KSBW-93">[93]</a> In 2015 most shellfish fisheries in Washington, Oregon and California were shut down because of high concentrations of toxic domoic acid in shellfish.<a href="#cite_note-shellfish-40">[40]</a> People have been warned that inhaling vapors from waves or wind during a HAB event may cause asthma attacks or lead to other respiratory ailments.<a href="#cite_note-94">[94]</a> In 2018 agricultural officials in <a href="/wiki/Utah" title="Utah">Utah</a> worried that even crops could become contaminated if irrigated with toxic water, although they admit that they can't measure contamination accurately because of so many variables in farming. They issued warnings to residents, however, out of caution.<a href="#cite_note-KSL-95">[95]</a> <div class="mw-heading mw-heading4"><h4 id="Drinking_water">Drinking water</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=18" title="Edit section: Drinking water">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Toxic_Algae_Bloom_in_Lake_Erie.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Toxic_Algae_Bloom_in_Lake_Erie.jpg/220px-Toxic_Algae_Bloom_in_Lake_Erie.jpg" decoding="async" width="220" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Toxic_Algae_Bloom_in_Lake_Erie.jpg/330px-Toxic_Algae_Bloom_in_Lake_Erie.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Toxic_Algae_Bloom_in_Lake_Erie.jpg/440px-Toxic_Algae_Bloom_in_Lake_Erie.jpg 2x" data-file-width="5000" data-file-height="4000" /></a><figcaption>Satellite image of <a href="/wiki/Lake_Erie" title="Lake Erie">Lake Erie</a> during a harmful algal bloom in 2011.</figcaption></figure> Persons are generally warned not to enter or drink water from algal blooms, or let their pets swim in the water since many pets have died from algal blooms.<a href="#cite_note-Russian-48">[48]</a> In at least one case, people began getting sick before warnings were issued.<a href="#cite_note-96">[96]</a> There is no treatment available for animals, including livestock cattle, if they drink from algal blooms where such toxins are present. Pets are advised to be kept away from algal blooms to avoid contact.<a href="#cite_note-97">[97]</a> In some locations visitors have been warned not to even touch the water.<a href="#cite_note-California-9">[9]</a> Boaters have been told that toxins in the water can be inhaled from the spray from wind or waves.<a href="#cite_note-Peebles-17">[17]</a><a href="#cite_note-California-9">[9]</a> Ocean beaches,<a href="#cite_note-Florida-98">[98]</a> lakes<a href="#cite_note-Utah-21">[21]</a> and rivers have been closed due to algal blooms.<a href="#cite_note-Utah2-84">[84]</a> After a dog died in 2015 from swimming in a bloom in California's <a href="/wiki/Russian_River_(California)" title="Russian River (California)">Russian River</a>, officials likewise posted warnings for parts of the river.<a href="#cite_note-99">[99]</a> Boiling the water at home before drinking does not remove the toxins.<a href="#cite_note-California-9">[9]</a> In August 2014 the city of <a href="/wiki/Toledo,_Ohio" title="Toledo, Ohio">Toledo, Ohio</a> advised its 500,000 residents to not drink tap water as the high toxin level from an algal bloom in western <a href="/wiki/Lake_Erie" title="Lake Erie">Lake Erie</a> had affected their water treatment plant's ability to treat the water to a safe level.<a href="#cite_note-Toledo-23">[23]</a> The emergency required using bottled water for all normal uses except showering, which seriously affected public services and commercial businesses. The bloom returned in 2015<a href="#cite_note-100">[100]</a> and was forecast again for the summer of 2016.<a href="#cite_note-101">[101]</a> In 2004, a bloom in Kisumu Bay, which is the drinking water source for 500,000 people in <a href="/wiki/Kisumu" title="Kisumu">Kisumu</a>, <a href="/wiki/Kenya" title="Kenya">Kenya</a>, suffered from similar water contamination.<a href="#cite_note-Circle-74">[74]</a> In China, water was cut off to residents in 2007 due to an algal bloom in its third largest lake, which forced 2 million people to use bottled water.<a href="#cite_note-102">[102]</a><a href="#cite_note-103">[103]</a> A smaller water shut-down in China affected 15,000 residents two years later at a different location.<a href="#cite_note-104">[104]</a> Australia in 2016 also had to cut off water to farmers.<a href="#cite_note-105">[105]</a> Alan Steinman of <a href="/wiki/Grand_Valley_State_University" title="Grand Valley State University">Grand Valley State University</a> has explained that among the major causes for the algal blooms in general, and Lake Erie specifically, is because blue-green algae thrive with high nutrients, along with warm and calm water. Lake Erie is more prone to blooms because it has a high nutrient level and is shallow, which causes it to warm up more quickly during the summer.<a href="#cite_note-106">[106]</a> Symptoms from drinking toxic water can show up within a few hours after exposure. They can include nausea, vomiting, and diarrhea, or trigger headaches and gastrointestinal problems.<a href="#cite_note-Utah-21">[21]</a> Although rare, liver toxicity can cause death.<a href="#cite_note-Utah-21">[21]</a> Those symptoms can then lead to dehydration, another major concern. In high concentrations, the toxins in the algal waters when simply touched can cause skin rashes, irritate the eyes, nose, mouth or throat.<a href="#cite_note-California-9">[9]</a> Those with suspected symptoms are told to call a doctor if symptoms persist or they can't hold down fluids after 24 hours.[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] In studies at the population level bloom coverage has been significantly related to the risk of non-alcoholic <a href="/wiki/Liver_disease" title="Liver disease">liver disease</a> death.<a href="#cite_note-107">[107]</a> <div class="mw-heading mw-heading4"><h4 id="Neurological_disorders">Neurological disorders</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=19" title="Edit section: Neurological disorders">edit</a>]</div> Toxic algae blooms are thought to play a role in humans developing degenerative neurological disorders such as <a href="/wiki/Amyotrophic_lateral_sclerosis" class="mw-redirect" title="Amyotrophic lateral sclerosis">amyotrophic lateral sclerosis</a> and <a href="/wiki/Parkinson%27s_disease" title="Parkinson's disease">Parkinson's disease</a>.<a href="#cite_note-108">[108]</a> Less than one percent of algal blooms produce hazardous toxins, such as <a href="/wiki/Microcystins" class="mw-redirect" title="Microcystins">microcystins</a>.<a href="#cite_note-NOAA-20">[20]</a> Although blue-green or other algae do not usually pose a direct threat to health, the <a href="/wiki/Toxins" class="mw-redirect" title="Toxins">toxins</a> (poisons) which they produce are considered dangerous to humans, land animals, sea mammals, birds<a href="#cite_note-Utah2-84">[84]</a> and fish when the toxins are ingested.<a href="#cite_note-NOAA-20">[20]</a> The toxins are <a href="/wiki/Neurotoxins" class="mw-redirect" title="Neurotoxins">neurotoxins</a> which destroy nerve tissue which can affect the nervous system, brain, and liver, and can lead to death.<a href="#cite_note-Utah-21">[21]</a> <div class="mw-heading mw-heading4"><h4 id="Effects_on_humans_from_harmful_algal_blooms_in_marine_environments">Effects on humans from harmful algal blooms in marine environments</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=20" title="Edit section: Effects on humans from harmful algal blooms in marine environments">edit</a>]</div> Humans are affected by the HAB species by ingesting improperly harvested shellfish, breathing in aerosolized brevetoxins (i.e. PbTx or Ptychodiscus toxins) and in some cases skin contact.<a href="#cite_note-:6-109">[109]</a> The brevetoxins bind to <a href="/wiki/Voltage-gated_sodium_channel" title="Voltage-gated sodium channel">voltage-gated sodium channels</a>, important structures of cell membranes. Binding results in persistent activation of nerve cells, which interferes with neural transmission leading to health problems. These toxins are created within the unicellular organism, or as a metabolic product.<a href="#cite_note-doi.org-110">[110]</a> The two major types of brevetoxin compounds have similar but distinct backbone structures. PbTx-2 is the primary intracellular brevetoxin produced by K. brevis blooms. However, over time, the PbTx-2 brevetoxin can be converted to PbTx-3 through metabolic changes.<a href="#cite_note-doi.org-110">[110]</a> Researchers found that PbTx-2 has been the primary intracellular brevetoxin that converts over time into PbTx-3.<a href="#cite_note-111">[111]</a> In the U.S., the seafood consumed by humans is tested regularly for toxins by the USDA to ensure safe consumption. Such testing is common in other nations. However, improper harvesting of shellfish can cause <a href="/wiki/Paralytic_shellfish_poisoning" title="Paralytic shellfish poisoning">paralytic shellfish poisoning</a> and neurotoxic shellfish poisoning in humans.<a href="#cite_note-:9-112">[112]</a><a href="#cite_note-:8-113">[113]</a> Some symptoms include drowsiness, diarrhea, nausea, loss of motor control, tingling, numbing or aching of extremities, incoherence, and respiratory paralysis.<a href="#cite_note-PMID10698729-114">[114]</a> Reports of skin irritation after swimming in the ocean during a HAB are common.<a href="#cite_note-:10-115">[115]</a> When the HAB cells rupture, they release extracellular brevetoxins into the environment. Some of those stay in the ocean, while other particles get aerosolized. During onshore winds, brevetoxins can become aerosolized by bubble-mediated transport, causing respiratory irritation, <a href="/wiki/Bronchoconstriction" title="Bronchoconstriction">bronchoconstriction</a>, coughing, and wheezing, among other symptoms.<a href="#cite_note-:10-115">[115]</a> It is recommended to avoid contact with wind-blown aerosolized toxin. Some individuals report a decrease in respiratory function after only 1 hour of exposure to a K. brevis red-tide beach and these symptoms may last for days.<a href="#cite_note-116">[116]</a> People with severe or persistent respiratory conditions (such as chronic lung disease or asthma) may experience stronger adverse reactions.[<a href="/wiki/Wikipedia:Identifying_reliable_sources_(medicine)" title="Wikipedia:Identifying reliable sources (medicine)">medical citation needed</a>] The <a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a>'s <a href="/wiki/National_Ocean_Service" title="National Ocean Service">National Ocean Service</a> provides a public conditions report identifying possible respiratory irritation impacts in areas affected by HABs.<a href="#cite_note-:444-117">[117]</a> <div class="mw-heading mw-heading3"><h3 id="Economic_impact">Economic impact</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=21" title="Edit section: Economic impact">edit</a>]</div> <div class="mw-heading mw-heading4"><h4 id="Recreation_and_tourism">Recreation and tourism</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=22" title="Edit section: Recreation and tourism">edit</a>]</div> The hazards which accompany harmful algal blooms have hindered visitors' enjoyment of beaches and lakes in places in the U.S. such as Florida,<a href="#cite_note-Florida-98">[98]</a> California,<a href="#cite_note-California-9">[9]</a> Vermont,<a href="#cite_note-118">[118]</a> and Utah.<a href="#cite_note-Utah2-84">[84]</a> Persons hoping to enjoy their vacations or days off have been kept away to the detriment of local economies. Lakes and rivers in <a href="/wiki/North_Dakota" title="North Dakota">North Dakota</a>, <a href="/wiki/Minnesota" title="Minnesota">Minnesota</a>, Utah, California and Ohio have had signs posted warning about the potential of health risk.<a href="#cite_note-119">[119]</a> Similar blooms have become more common in Europe, with France among the countries reporting them. In the summer of 2009, beaches in northern <a href="/wiki/Brittany" title="Brittany">Brittany</a> became covered by tonnes of potentially lethal rotting green algae. A horse being ridden along the beach collapsed and died from fumes given off by the rotting algae.<a href="#cite_note-120">[120]</a> The economic damage resulting from lost business has become a serious concern. According to one report in 2016, the four main economic impacts from harmful algal blooms come from damage to human health, fisheries, tourism and recreation, and the cost of monitoring and management of area where blooms appear.<a href="#cite_note-JRC-121">[121]</a> EPA estimates that algal blooms impact 65 percent of the country's major estuaries, with an annual cost of $2.2 billion.<a href="#cite_note-KSL-95">[95]</a> In the U.S. there are an estimated 166 coastal dead zones.<a href="#cite_note-KSL-95">[95]</a> Because data collection has been more difficult and limited from sources outside the U.S., most of the estimates as of 2016 have been primarily for the U.S.<a href="#cite_note-JRC-121">[121]</a> In port cities in the <a href="/wiki/Shandong_Province" class="mw-redirect" title="Shandong Province">Shandong Province</a> of eastern China, residents are no longer surprised when massive algal blooms arrive each year and inundate beaches. Prior to the Beijing Olympics in 2008, over 10,000 people worked to clear 20,000 tons of dead algae from beaches.<a href="#cite_note-China-122">[122]</a> In 2013 another bloom in China, thought to be its largest ever,<a href="#cite_note-123">[123]</a> covered an area of 7,500 square miles,<a href="#cite_note-China-122">[122]</a> and was followed by another in 2015 which blanketed an even greater 13,500 square miles. The blooms in China are thought to be caused by pollution from untreated agricultural and industrial discharges into rivers leading to the ocean.<a href="#cite_note-124">[124]</a> <div class="mw-heading mw-heading4"><h4 id="Fisheries_industry">Fisheries industry</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=23" title="Edit section: Fisheries industry">edit</a>]</div> As early as 1976 a short-term, relatively small, dead zone off the coasts of <a href="/wiki/New_York_(state)" title="New York (state)">New York</a> and <a href="/wiki/New_Jersey" title="New Jersey">New Jersey</a> cost commercial and recreational fisheries over $500 million.<a href="#cite_note-SciAm2-125">[125]</a> In 1998 a HAB in Hong Kong killed over $10 million in high-value fish.<a href="#cite_note-Brown-76">[76]</a> In 2009, the economic impact for the state of <a href="/wiki/Washington_(state)" title="Washington (state)">Washington's</a> coastal counties dependent on its fishing industry was estimated to be $22 million.<a href="#cite_note-126">[126]</a> In 2016, the U.S. seafood industry expected future lost revenue could amount to $900 million annually.<a href="#cite_note-JRC-121">[121]</a> NOAA has provided a few cost estimates for various blooms over the past few years:<a href="#cite_note-NOAA3-127">[127]</a> $10.3 million in 2011 due to a HAB at Texas oyster landings; $2.4 million lost income by tribal commerce from 2015 fishery closures in the pacific northwest; $40 million from Washington state's loss of tourism from the same fishery closure. Along with damage to businesses, the toll from human sickness results in lost wages and damaged health. The costs of medical treatment, investigation by health agencies through water sampling and testing, and the posting of warning signs at effected locations is also costly.<a href="#cite_note-WHOI-128">[128]</a> The closures applied to areas where this algae bloom occurs has a big negative impact of the fishing industries, add to that the high fish mortality that follows, the increase in price due to the shortage of fish available and decrease in the demand for seafood due to the fear of contamination by toxins.<a href="#cite_note-129">[129]</a> This causes a big economic loss for the industry. Economic costs are estimated to rise. In June 2015, for instance, the largest known toxic HAB forced the shutdown of the west coast shellfish industry, the first time that has ever happened. One Seattle NOAA expert commented, "This is unprecedented in terms of the extent and magnitude of this harmful algal bloom and the warm water conditions we're seeing offshore...."<a href="#cite_note-Oregon-130">[130]</a> The bloom covered a range from <a href="/wiki/Santa_Barbara,_California" title="Santa Barbara, California">Santa Barbara, California</a> northward to <a href="/wiki/Alaska" title="Alaska">Alaska</a>.<a href="#cite_note-131">[131]</a> The negative impact on fish can be even more severe when they are confined to pens, as they are in fish farms. In 2007 a fish farm in <a href="/wiki/British_Columbia" title="British Columbia">British Columbia</a> lost 260 tons of salmon as a result of blooms,<a href="#cite_note-132">[132]</a> and in 2016 a farm in Chile lost 23 million salmon after <a href="/wiki/Red_tide_crisis_in_Chilo%C3%A9" title="Red tide crisis in Chiloé">an algal bloom</a>.<a href="#cite_note-133">[133]</a> <div class="mw-heading mw-heading3"><h3 id="Environmental_impact">Environmental impact</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=24" title="Edit section: Environmental impact">edit</a>]</div> <div class="mw-heading mw-heading4"><h4 id="Dead_zones">Dead zones</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=25" title="Edit section: Dead zones">edit</a>]</div> The presence of harmful algae bloom's can lead to <a href="/wiki/Hypoxia_(environmental)" title="Hypoxia (environmental)">hypoxia</a> or <a href="/wiki/Anoxic_waters" title="Anoxic waters">anoxia</a> in a body of water. The depletion of oxygen within a body of water can lead to the creation of a <a href="/wiki/Dead_zone_(ecology)" title="Dead zone (ecology)">dead zone</a>. Dead zones occur when a body of water has become unsuitable for organism survival in that location. HAB's cause dead zones by consuming oxygen in these bodies of water - leaving minimal oxygen available to other marine organisms. When the HAB's die, their bodies will sink to the bottom of the body of water - as the decaying of their bodies (through bacteria) is what causes the consumption of oxygen. Once oxygen levels get so low, the HAB's have placed the body of water in hypoxia - and these low oxygen levels will cause marine organisms to seek out better suited locations for their survival.<a href="#cite_note-134">[134]</a> Blooms can harm the environment even without producing toxins by depleting oxygen from the water when growing and while decaying after they die. Blooms can also block sunlight to organisms living beneath it. A record-breaking number and size of blooms have formed in the Pacific coast, in Lake Erie, in the Chesapeake Bay and in the Gulf of Mexico, where a number of dead zones were created as a result.<a href="#cite_note-Huffington-135">[135]</a> In the 1960s the number of dead zones worldwide was 49; the number rose to over 400 by 2008.<a href="#cite_note-SciAm2-125">[125]</a> Among the largest dead zones were those in northern Europe's <a href="/wiki/Baltic_Sea" title="Baltic Sea">Baltic Sea</a> and the Gulf of Mexico, which affects a $2.8 billion U.S. fish industry.<a href="#cite_note-Circle-74">[74]</a> Unfortunately, dead zones rarely recover and usually grow in size.<a href="#cite_note-SciAm2-125">[125]</a> One of the few dead zones to ever recover was in the <a href="/wiki/Black_Sea" title="Black Sea">Black Sea</a>, which returned to normal fairly quickly after the collapse of the Soviet Union in the 1990s due to a resulting reduction in fertilizer use.<a href="#cite_note-SciAm2-125">[125]</a> <style data-mw-deduplicate="TemplateStyles:r1237032888/mw-parser-output/.tmulti">.mw-parser-output .tmulti .multiimageinner{display:flex;flex-direction:column}.mw-parser-output .tmulti .trow{display:flex;flex-direction:row;clear:left;flex-wrap:wrap;width:100%;box-sizing:border-box}.mw-parser-output .tmulti .tsingle{margin:1px;float:left}.mw-parser-output .tmulti .theader{clear:both;font-weight:bold;text-align:center;align-self:center;background-color:transparent;width:100%}.mw-parser-output .tmulti .thumbcaption{background-color:transparent}.mw-parser-output .tmulti .text-align-left{text-align:left}.mw-parser-output .tmulti .text-align-right{text-align:right}.mw-parser-output .tmulti .text-align-center{text-align:center}@media all and (max-width:720px){.mw-parser-output .tmulti .thumbinner{width:100%!important;box-sizing:border-box;max-width:none!important;align-items:center}.mw-parser-output .tmulti .trow{justify-content:center}.mw-parser-output .tmulti .tsingle{float:none!important;max-width:100%!important;box-sizing:border-box;text-align:center}.mw-parser-output .tmulti .tsingle .thumbcaption{text-align:left}.mw-parser-output .tmulti .trow>.thumbcaption{text-align:center}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .tmulti .multiimageinner img{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .tmulti .multiimageinner img{background-color:white}}</style><div class="thumb tmulti tleft"><div class="thumbinner multiimageinner" style="width:608px;max-width:608px"><div class="trow"><div class="tsingle" style="width:302px;max-width:302px"><div class="thumbimage"><video id="mwe_player_0" poster="//upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv/300px--Scientists_discover_under-ice_phytoplankton_bloom_1.ogv.jpg" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="300" height="169" data-durationhint="111" data-mwtitle="Scientists_discover_under-ice_phytoplankton_bloom_1.ogv" data-mwprovider="wikimediacommons"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv.480p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="480p.vp9.webm" data-width="854" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv" type="video/ogg; codecs="theora, vorbis"" data-width="960" data-height="540" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv.240p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="240p.vp9.webm" data-width="426" data-height="240" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv.360p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="360p.vp9.webm" data-width="640" data-height="360" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/b/b6/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv/Scientists_discover_under-ice_phytoplankton_bloom_1.ogv.360p.webm" type="video/webm; codecs="vp8, vorbis"" data-transcodekey="360p.webm" data-width="640" data-height="360" /></video></div><div class="thumbcaption">The US Coast Guard Cutter Healy ferried scientists to 26 study sites in the Arctic, where blooms ranged in concentration from high (red) to low (purple).</div></div><div class="tsingle" style="width:302px;max-width:302px"><div class="thumbimage"><video id="mwe_player_1" poster="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv/300px--Scientists_discover_under-ice_phytoplankton_bloom_2.ogv.jpg" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="300" height="169" data-durationhint="80" data-mwtitle="Scientists_discover_under-ice_phytoplankton_bloom_2.ogv" data-mwprovider="wikimediacommons"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv.480p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="480p.vp9.webm" data-width="854" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv" type="video/ogg; codecs="theora, vorbis"" data-width="960" data-height="540" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv.240p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="240p.vp9.webm" data-width="426" data-height="240" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv.360p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="360p.vp9.webm" data-width="640" data-height="360" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/c/cb/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv/Scientists_discover_under-ice_phytoplankton_bloom_2.ogv.360p.webm" type="video/webm; codecs="vp8, vorbis"" data-transcodekey="360p.webm" data-width="640" data-height="360" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&title=File%3AScientists_discover_under-ice_phytoplankton_bloom_2.ogv&lang=en&trackformat=vtt&origin=%2A" kind="subtitles" type="text/vtt" srclang="en" label="English ‪(en)‬" data-dir="ltr" /></video></div><div class="thumbcaption">Researcher David Mayer of Clark University lowers a video camera below the ice to observe a dense bloom of phytoplankton.</div></div></div></div></div> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading4"><h4 id="Fish_die-offs">Fish die-offs</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=26" title="Edit section: Fish die-offs">edit</a>]</div> Massive fish die-offs have been caused by HABs.<a href="#cite_note-WHOI-2-136">[136]</a> In 2016, 23 million salmon which were being farmed in Chile died from a toxic algae bloom.<a href="#cite_note-salmon-137">[137]</a> To get rid of the dead fish, the ones fit for consumption were made into fishmeal and the rest were dumped 60 miles offshore to avoid risks to human health.<a href="#cite_note-salmon-137">[137]</a> The economic cost of that die-off is estimated to have been $800 million.<a href="#cite_note-salmon-137">[137]</a> Environmental expert <a href="/wiki/Lester_Brown" class="mw-redirect" title="Lester Brown">Lester Brown</a> has written that the farming of salmon and shrimp in offshore ponds concentrates waste, which contributes to <a href="/wiki/Eutrophication" title="Eutrophication">eutrophication</a> and the creation of dead zones.<a href="#cite_note-138">[138]</a> Other countries have reported similar impacts, with cities such as <a href="/wiki/Rio_de_Janeiro" title="Rio de Janeiro">Rio de Janeiro</a>, Brazil seeing major fish die-offs from blooms becoming a common occurrence.<a href="#cite_note-Brazil-139">[139]</a> In early 2015, Rio collected an estimated 50 tons of dead fish from the lagoon where water events in the 2016 Olympics were planned to take place.<a href="#cite_note-Brazil-139">[139]</a> The <a href="/wiki/Monterey_Bay" title="Monterey Bay">Monterey Bay</a> has suffered from harmful algal blooms, most recently in 2015: "Periodic blooms of toxin-producing <a href="/wiki/Pseudo-nitzschia" title="Pseudo-nitzschia">Pseudo-nitzschia</a> diatoms have been documented for over 25 years in Monterey Bay and elsewhere along the U.S. west coast. During large blooms, the <a href="/wiki/Bioaccumulation" title="Bioaccumulation">toxin accumulates</a> in shellfish and small fish such as anchovies and sardines that feed on algae, forcing the closure of some fisheries and poisoning marine mammals and birds that feed on contaminated fish."<a href="#cite_note-140">[140]</a> Similar fish die-offs from toxic algae or lack of oxygen have been seen in Russia,<a href="#cite_note-141">[141]</a> Colombia,<a href="#cite_note-142">[142]</a> Vietnam,<a href="#cite_note-143">[143]</a> China,<a href="#cite_note-144">[144]</a> Canada,<a href="#cite_note-145">[145]</a> Turkey,<a href="#cite_note-146">[146]</a> Indonesia,<a href="#cite_note-147">[147]</a> and France.<a href="#cite_note-148">[148]</a> <div class="mw-heading mw-heading4"><h4 id="Land_animal_deaths">Land animal deaths</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=27" title="Edit section: Land animal deaths">edit</a>]</div> Land animals, including livestock and pets have been affected. Dogs have died from the toxins after swimming in algal blooms.<a href="#cite_note-149">[149]</a> Warnings have come from government agencies in the state of Ohio, which noted that many dogs and livestock deaths resulted from HAB exposure in the U.S. and other countries. They also noted in a 2003 report that during the previous 30 years, they have seen more frequent and longer-lasting harmful algal blooms."<a href="#cite_note-Ohio-150">[150]</a> In 50 countries and 27 states that year there were reports of human and animal illnesses linked to algal toxins.<a href="#cite_note-Ohio-150">[150]</a> In Australia, the department of agriculture warned farmers that the toxins from a HAB had the "potential to kill large numbers of livestock very quickly."<a href="#cite_note-151">[151]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Dead_whale_NOAA.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Dead_whale_NOAA.jpg/220px-Dead_whale_NOAA.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Dead_whale_NOAA.jpg/330px-Dead_whale_NOAA.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Dead_whale_NOAA.jpg/440px-Dead_whale_NOAA.jpg 2x" data-file-width="576" data-file-height="385" /></a><figcaption>Whales can be killed by harmful algal blooms</figcaption></figure> Marine mammals have also been seriously harmed, as over 50 percent of unusual marine mammal deaths are caused by harmful algal blooms.<a href="#cite_note-152">[152]</a> In 1999, over 65 <a href="/wiki/Bottlenose_dolphins" class="mw-redirect" title="Bottlenose dolphins">bottlenose dolphins</a> died during a coastal HAB in Florida.<a href="#cite_note-153">[153]</a> In 2013 a HAB in southwest Florida killed a record number of <a href="/wiki/Manatee" title="Manatee">Manatee</a>.<a href="#cite_note-154">[154]</a> Whales have also died in large numbers. During the period from 2005 to 2014, Argentina reported an average 65 baby whales dying which experts have linked to algal blooms. A whale expert there expects the whale population to be reduced significantly.<a href="#cite_note-155">[155]</a> In 2003 off <a href="/wiki/Cape_Cod" title="Cape Cod">Cape Cod</a> in the North Atlantic, at least 12 humpback whales died from toxic algae from a HAB.<a href="#cite_note-156">[156]</a> In 2015 Alaska and British Columbia reported many <a href="/wiki/Humpback_whales" class="mw-redirect" title="Humpback whales">humpback whales</a> had likely died from HAB toxins, with 30 having washed ashore in Alaska. "Our leading theory at this point is that the harmful algal bloom has contributed to the deaths," said a NOAA spokesperson.<a href="#cite_note-157">[157]</a><a href="#cite_note-158">[158]</a> Birds have died after eating dead fish contaminated with toxic algae. Rotting and decaying fish are eaten by birds such as <a href="/wiki/Pelicans" class="mw-redirect" title="Pelicans">pelicans</a>, <a href="/wiki/Seagulls" class="mw-redirect" title="Seagulls">seagulls</a>, <a href="/wiki/Cormorant" title="Cormorant">cormorants</a>, and possibly marine or land mammals, which then become poisoned.<a href="#cite_note-WHOI-2-136">[136]</a> The nervous systems of dead birds were examined and had failed from the toxin's effect.<a href="#cite_note-KSBW-93">[93]</a> On the Oregon and Washington coast, a thousand <a href="/wiki/Scoter" title="Scoter">scoters</a>, or sea ducks, were also killed in 2009. "This is huge," said a university professor.<a href="#cite_note-Oregon2-159">[159]</a> As dying or dead birds washed up on the shore, wildlife agencies went into "an emergency crisis mode."<a href="#cite_note-Oregon2-159">[159]</a> It has even been suggested that harmful algal blooms are responsible for the deaths of animals found in fossil troves,<a href="#cite_note-160">[160]</a> such as the dozens of <a href="/wiki/Cetacean" class="mw-redirect" title="Cetacean">cetacean</a> skeletons found at <a href="/wiki/Cerro_Ballena" title="Cerro Ballena">Cerro Ballena</a>.<a href="#cite_note-161">[161]</a> <div class="mw-heading mw-heading3"><h3 id="Effects_on_marine_ecosystems">Effects on marine ecosystems</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=28" title="Edit section: Effects on marine ecosystems">edit</a>]</div> Harmful algal blooms in marine ecosystems have been observed to cause adverse effects to a wide variety of aquatic organisms, most notably marine mammals, sea turtles, seabirds and finfish. The impacts of HAB toxins on these groups can include harmful changes to their developmental, immunological, neurological, or reproductive capacities. The most conspicuous effects of HABs on marine wildlife are large-scale mortality events associated with toxin-producing blooms. For example, a <a href="/wiki/Mass_mortality_event" title="Mass mortality event">mass mortality event</a> of 107 <a href="/wiki/Bottlenose_dolphins" class="mw-redirect" title="Bottlenose dolphins">bottlenose dolphins</a> occurred along the Florida panhandle in the spring of 2004 due to ingestion of contaminated <a href="/wiki/Menhaden" title="Menhaden">menhaden</a> with high levels of <a href="/wiki/Brevetoxin" title="Brevetoxin">brevetoxin</a>.<a href="#cite_note-Flewelling_LJ_2005-162">[162]</a> Manatee mortalities have also been attributed to brevetoxin but unlike dolphins, the main toxin vector was endemic seagrass species (Thalassia testudinum) in which high concentrations of brevetoxins were detected and subsequently found as a main component of the stomach contents of manatees.<a href="#cite_note-Flewelling_LJ_2005-162">[162]</a> Additional marine mammal species, like the highly endangered <a href="/wiki/North_Atlantic_right_whale" title="North Atlantic right whale">North Atlantic right whale</a>, have been exposed to neurotoxins by preying on highly contaminated <a href="/wiki/Zooplankton" title="Zooplankton">zooplankton</a>.<a href="#cite_note-Durbin_E_2002-163">[163]</a> With the summertime habitat of this species overlapping with seasonal blooms of the toxic dinoflagellate Alexandrium fundyense, and subsequent copepod grazing, foraging right whales will ingest large concentrations of these contaminated <a href="/wiki/Copepods" class="mw-redirect" title="Copepods">copepods</a>. Ingestion of such contaminated prey can affect respiratory capabilities, feeding behavior, and ultimately the reproductive condition of the population.<a href="#cite_note-Durbin_E_2002-163">[163]</a> Immune system responses have been affected by brevetoxin exposure in another critically endangered species, the <a href="/wiki/Loggerhead_sea_turtle" title="Loggerhead sea turtle">loggerhead sea turtle</a>. Brevetoxin exposure, from inhalation of aerosolized toxins and ingestion of contaminated prey, can have clinical signs of increased lethargy and muscle weakness in loggerhead sea turtles causing these animals to wash ashore in a decreased metabolic state with increases of immune system responses upon blood analysis.<a href="#cite_note-164">[164]</a> Examples of common harmful effects of HABs include: <ol><li>the production of neurotoxins which cause mass mortalities in fish, seabirds, sea turtles, and marine mammals</li> <li>human illness or death from consumption of seafood contaminated by toxic algae<a href="#cite_note-165">[165]</a></li> <li>mechanical damage to other organisms, such as disruption of epithelial gill tissues in fish, resulting in asphyxiation</li> <li>oxygen depletion of the water column (hypoxia or <a href="/wiki/Anoxic_waters" title="Anoxic waters">anoxia</a>) from cellular respiration and bacterial degradation</li></ol> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Gulf_dead_zone.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Gulf_dead_zone.jpg/220px-Gulf_dead_zone.jpg" decoding="async" width="220" height="155" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Gulf_dead_zone.jpg/330px-Gulf_dead_zone.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Gulf_dead_zone.jpg/440px-Gulf_dead_zone.jpg 2x" data-file-width="540" data-file-height="380" /></a><figcaption>Dead zone in the southern U.S.</figcaption></figure> <div class="mw-heading mw-heading4"><h4 id="Marine_life_exposure">Marine life exposure</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=29" title="Edit section: Marine life exposure">edit</a>]</div> HABs occur naturally off coasts all over the world. Marine dinoflagellates produce ichthyotoxins. Where HABs occur, dead fish wash up on shore for up to two weeks after a HAB has been through the area. In addition to killing fish, the toxic algae contaminate shellfish. Some <a href="/wiki/Mollusks" class="mw-redirect" title="Mollusks">mollusks</a> are not susceptible to the toxin, and store it in their fatty tissues. By consuming the organisms responsible for HABs, shellfish can accumulate and retain <a href="/wiki/Saxitoxin" title="Saxitoxin">saxitoxin</a> produced by these organisms. Saxitoxin blocks <a href="/wiki/Sodium_channel" title="Sodium channel">sodium channels</a> and ingestion can cause <a href="/wiki/Paralysis" title="Paralysis">paralysis</a> within 30 minutes.<a href="#cite_note-:8-113">[113]</a> In addition to directly harming marine animals and vegetation loss, harmful algal blooms can also lead to <a href="/wiki/Ocean_acidification" title="Ocean acidification">ocean acidification</a>, which occurs when the amount of carbon dioxide in the water is increased to unnatural levels. Ocean acidification slows the growth of certain species of fish and shellfish, and even prevents shell formation in certain species of mollusks. These subtle, small changes can add up over time to cause chain reactions and devastating effects on whole marine ecosystems.<a href="#cite_note-166">[166]</a> Other animals that eat exposed shellfish are susceptible to the neurotoxin, which may lead to neurotoxic shellfish poisoning<a href="#cite_note-:9-112">[112]</a> and sometimes even death. Most mollusks and clams filter feed, which results in higher concentrations of the toxin than just drinking the water.<a href="#cite_note-:111-167">[167]</a> <a href="/wiki/Scaup" title="Scaup">Scaup</a>, for example, are <a href="/wiki/Diving_ducks" class="mw-redirect" title="Diving ducks">diving ducks</a> whose diet mainly consists of mollusks. When scaup eat the filter-feeding shellfish that have accumulated high levels of the HAB toxin, their population becomes a prime target for poisoning. However, even birds that do not eat mollusks can be affected by simply eating dead fish on the beach or drinking the water.<a href="#cite_note-:22-168">[168]</a> The toxins released by the blooms can kill marine animals including <a href="/wiki/Dolphin" title="Dolphin">dolphins</a>, sea turtles, birds, and <a href="/wiki/Manatee" title="Manatee">manatees</a>.<a href="#cite_note-:7-169">[169]</a><a href="#cite_note-170">[170]</a> The Florida Manatee, a subspecies of the West Indian Manatee, is a species often impacted by red tide blooms. Florida manatees are often exposed to the poisonous red-tide toxins either by consumption or inhalation. There are many small barnacles, crustaceans, and other <a rel="nofollow" class="external text" href="https://edis.ifas.ufl.edu/publication/SG188">epiphytes</a> that grow on the blades of seagrass. These tiny creatures filter particles from the water around them and use these particles as their main food source. During red tide blooms, they also filter the toxic red tide cells from the water, which then becomes concentrated inside them. Although these toxins do not harm epiphytes, they are extremely poisonous to marine creatures who consume (or accidentally consume) the exposed epiphytes, such as manatees. When manatees unknowingly consume exposed epiphytes while grazing on sea grass, the toxins are subsequently released from the epiphytes and ingested by the manatees. In addition to consumption, manatees may also become exposed to air-borne Brevetoxins released from harmful red-tide cells when passing through algal blooms.<a href="#cite_note-171">[171]</a> Manatees also have an immunoresponse to HABs and their toxins that can make them even more susceptible to other stressors. Due to this susceptibility, manatees can die from either the immediate, or the after effects of the HAB.<a href="#cite_note-172">[172]</a> In addition to causing manatee mortalities, red-tide exposure also causes severe <a rel="nofollow" class="external text" href="https://www.researchgate.net/publication/271274562_Sublethal_red_tide_toxin_exposure_in_free-ranging_manatees_Trichechus_manatus_affects_the_immune_system_through_reduced_lymphocyte_proliferation_responses_inflammation_and_oxidative_stress">sublethal health problems among Florida manatee populations</a>. Studies have shown that red-tide exposure among free-ranging Florida manatees has been shown to negatively impact immune functioning by causing increased inflammation, a reduction in lymphocyte proliferation responses, and oxidative stress.<a href="#cite_note-173">[173]</a> Fish such as Atlantic herring, American pollock, winter flounder, Atlantic salmon, and cod were dosed orally with these toxins in an experiment, and within minutes the subjects started to exhibit a loss of equilibrium and began to swim in an irregular, jerking pattern, followed by paralysis and shallow, arrhythmic breathing and eventually death, after about an hour.<a href="#cite_note-:33-174">[174]</a> HABs have been shown to have a negative effect also in the memory functions of sea lions.<a href="#cite_note-175">[175]</a> <div class="mw-heading mw-heading2"><h2 id="Potential_remedies">Potential remedies</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=30" title="Edit section: Potential remedies">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Eutrophication#Reversal_and_remediation" title="Eutrophication">eutrophication § Reversal and remediation</a></div> <div class="mw-heading mw-heading3"><h3 id="Reducing_nutrient_runoff">Reducing nutrient runoff</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=31" title="Edit section: Reducing nutrient runoff">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Runoff_of_soil_%26_fertilizer.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Runoff_of_soil_%26_fertilizer.jpg/220px-Runoff_of_soil_%26_fertilizer.jpg" decoding="async" width="220" height="157" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Runoff_of_soil_%26_fertilizer.jpg/330px-Runoff_of_soil_%26_fertilizer.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/95/Runoff_of_soil_%26_fertilizer.jpg/440px-Runoff_of_soil_%26_fertilizer.jpg 2x" data-file-width="2100" data-file-height="1500" /></a><figcaption>Soil and fertilizer runoff from a farm after heavy rains</figcaption></figure> Since many algal blooms are caused by a major influx of nutrient-rich runoff into a water body, programs to treat wastewater, reduce the overuse of fertilizers in agriculture and reducing the bulk flow of runoff can be effective for reducing severe algal blooms at river mouths, <a href="/wiki/Estuary" title="Estuary">estuaries</a>, and the ocean directly in front of the river's mouth. The nitrates and phosphorus in fertilizers cause algal blooms when they run off into lakes and rivers after heavy rains. Modifications in farming methods have been suggested, such as only using fertilizer in a targeted way at the appropriate time exactly where it can do the most good for crops to reduce potential runoff.<a href="#cite_note-SciAm-176">[176]</a> A method used successfully is <a href="/wiki/Drip_irrigation" title="Drip irrigation">drip irrigation</a>, which instead of widely dispersing fertilizers on fields, drip-irrigates plant roots through a network of tubes and emitters, leaving no traces of fertilizer to be washed away.<a href="#cite_note-177">[177]</a> Drip irrigation also prevents the formation of algal blooms in <a href="/wiki/Reservoirs" class="mw-redirect" title="Reservoirs">reservoirs</a> for drinking water while saving up to 50% of water typically used by agriculture.<a href="#cite_note-178">[178]</a><a href="#cite_note-179">[179]</a> There have also been proposals to create buffer zones of foliage and wetlands to help filter out the phosphorus before it reaches water.<a href="#cite_note-SciAm-176">[176]</a> Other experts have suggested using conservation tillage, changing crop rotations, and restoring wetlands.<a href="#cite_note-SciAm-176">[176]</a> It is possible for some dead zones to shrink within a year under proper management.<a href="#cite_note-Larsen-180">[180]</a> There have been a few success stories in controlling chemicals. After Norway's lobster fishery collapsed in 1986 due to low oxygen levels, for instance, the government in neighboring Denmark took action and reduced phosphorus output by 80 percent which brought oxygen levels closer to normal.<a href="#cite_note-Larsen-180">[180]</a> Similarly, dead zones in the <a href="/wiki/Black_Sea" title="Black Sea">Black Sea</a> and along the <a href="/wiki/Danube_River" class="mw-redirect" title="Danube River">Danube River</a> recovered after phosphorus applications by farmers were reduced by 60%.<a href="#cite_note-Larsen-180">[180]</a> Nutrients can be permanently removed from wetlands harvesting wetland plants, reducing nutrient influx into surrounding bodies of water.<a href="#cite_note-181">[181]</a><a href="#cite_note-182">[182]</a> Research is ongoing to determine the efficacy of floating mats of cattails in removing nutrients from surface waters too deep to sustain the growth of wetland plants.<a href="#cite_note-183">[183]</a> In the U.S., surface runoff is the largest source of nutrients added to rivers and lakes, but is mostly unregulated under the federal <a href="/wiki/Clean_Water_Act" title="Clean Water Act">Clean Water Act</a>.<a href="#cite_note-EPA_319_report-184">[184]</a>: 10  <a href="#cite_note-NPDES_basic-185">[185]</a><a href="#cite_note-186">[186]</a> Locally developed initiatives to reduce <a href="/wiki/Nutrient_pollution" title="Nutrient pollution">nutrient pollution</a> are underway in various areas of the country, such as the <a href="/wiki/Great_Lakes" title="Great Lakes">Great Lakes</a> region and the <a href="/wiki/Chesapeake_Bay" title="Chesapeake Bay">Chesapeake Bay</a>.<a href="#cite_note-EPA-Great_Lakes-187">[187]</a><a href="#cite_note-EPA-Chesapeake_TMDL-188">[188]</a> To help reduce algal blooms in <a href="/wiki/Lake_Erie" title="Lake Erie">Lake Erie</a>, the State of <a href="/wiki/Ohio" title="Ohio">Ohio</a> presented a plan in 2016 to reduce phosphorus runoff.<a href="#cite_note-189">[189]</a> <div class="mw-heading mw-heading3"><h3 id="Chemical_treatment">Chemical treatment</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=32" title="Edit section: Chemical treatment">edit</a>]</div> Although a number of <a href="/wiki/Algaecide" title="Algaecide">algaecides</a> have been effective in killing algae, they have been used mostly in small bodies of water. For large algal blooms, however, adding algaecides such as silver nitrate or copper sulfate can have worse effects, such as killing fish outright and harming other wildlife.<a href="#cite_note-Greensburg-190">[190]</a> Cyanobacteria can also develop resistance to copper-containing algaecides, requiring a larger quantity of the chemical to be effective for HAB management, but introducing a greater risk to other species in the region.<a href="#cite_note-Zerrifi-et-al-2018-191">[191]</a> The negative effects can therefore be worse than letting the algae die off naturally.<a href="#cite_note-Greensburg-190">[190]</a><a href="#cite_note-OSU-192">[192]</a><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Efficacy_of_Aluminum_Modified_Clays.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Efficacy_of_Aluminum_Modified_Clays.png/220px-Efficacy_of_Aluminum_Modified_Clays.png" decoding="async" width="220" height="115" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Efficacy_of_Aluminum_Modified_Clays.png/330px-Efficacy_of_Aluminum_Modified_Clays.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Efficacy_of_Aluminum_Modified_Clays.png/440px-Efficacy_of_Aluminum_Modified_Clays.png 2x" data-file-width="509" data-file-height="266" /></a><figcaption>The left graph shows the efficacy of aluminum chloride modified clay (AC-MC), aluminum sulfide modified clay (AS-MC), polyaluminum modified clay (PAC-MC) and standard untreated clay in deionized water for removing <a href="/wiki/Aureococcus_anophagefferens" class="mw-redirect" title="Aureococcus anophagefferens">Aureococcus anophagefferens</a>, a bloom causing algae. The right graph shows the same clays tested in seawater.<a href="#cite_note-Liu-et-al-2016-193">[193]</a></figcaption></figure> In 2019, <a href="/wiki/Chippewa_Lake" class="mw-redirect" title="Chippewa Lake">Chippewa Lake</a> in Northeast Ohio became the first lake in the U.S. to successfully test a new chemical treatment. The chemical formula killed all of the toxic algae in the lake within a single day. The formula has already been used in China, South Africa and Israel.<a href="#cite_note-194">[194]</a> In February 2020, <a href="/wiki/Roodeplaat_Dam" title="Roodeplaat Dam">Roodeplaat Dam</a> in <a href="/wiki/Gauteng" title="Gauteng">Gauteng</a> Province, <a href="/wiki/South_Africa" title="South Africa">South Africa</a> was treated with a new <a href="/wiki/Algaecide" title="Algaecide">algicide</a> formulation against a severe bloom of <a href="/wiki/Microcystis" title="Microcystis">Microcystis</a> sp. This formulation allows the granular product to float and slow-release its active ingredient, <a href="/wiki/Sodium_percarbonate" title="Sodium percarbonate">sodium percarbonate</a>, that releases <a href="/wiki/Hydrogen_peroxide" title="Hydrogen peroxide">hydrogen peroxide</a> (H2O2), on the water surface. Consequently, the effective concentrations are limited, vertically, to the surface of the water; and spatially to areas where <a href="/wiki/Cyanobacteria" title="Cyanobacteria">cyanobacteria</a> are abundant. This provide the aquatic organisms a "safe haven" in untreated areas and avoids the adverse effects associated with the use of standard <a href="/wiki/Algaecide" title="Algaecide">algicides</a>.<a href="#cite_note-195">[195]</a> Bioactive compounds isolated from terrestrial and aquatic plants, particularly seaweeds, have seen results as a more environmentally friendly control for HABs. Molecules found in seaweeds such as <a href="/wiki/Corallina" title="Corallina">Corallina</a>, <a href="/wiki/Sargassum" title="Sargassum">Sargassum</a>, and <a href="/wiki/Saccharina_japonica" title="Saccharina japonica">Saccharina japonica</a> have shown to inhibit some bloom-forming microalgae. In addition to their anti-microalgal effects, the bioactive molecules found in these seaweeds also have antibacterial, antifungal, and antioxidant properties.<a href="#cite_note-Zerrifi-et-al-2018-191">[191]</a> <div class="mw-heading mw-heading4"><h4 id="Removal_of_HABs_using_aluminum-modified_clay">Removal of HABs using aluminum-modified clay</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=33" title="Edit section: Removal of HABs using aluminum-modified clay">edit</a>]</div> Other chemicals are being tested for their efficacy for removing cyanobacteria during blooms. Modified clays, such as aluminum chloride modified clay (AC-MC), aluminum sulfide modified clay (AS-MC) and polyaluminum chloride modified clay (PAC-MC) have shown positive results in vitro for the removal of <a href="/wiki/Aureococcus" title="Aureococcus">Aureococcus</a> by trapping the microalgae in the sediment of clay, removing it from the top layer of water where harmful blooms can occur.<a href="#cite_note-Liu-et-al-2016-193">[193]</a> Many efforts have been made in an attempt to control HAB's so that the harm that they cause can be kept at a minimum. Studies into the use of clay to control HAB's have proven that this method may be an effective way to reduce the negative effects caused by HAB's. The addition of <a href="/wiki/Aluminium_chloride" title="Aluminium chloride">aluminum chloride</a>, <a href="/wiki/Aluminium_sulfate" title="Aluminium sulfate">aluminum sulfate</a>, or <a href="/wiki/Polyaluminium_chloride" class="mw-redirect" title="Polyaluminium chloride">polyaluminum chloride</a> to clay can modify the clay surface and increase its efficiency in the removal of HAB's from a body of water. The addition of aluminum-containing compounds causes the clay particles to achieve a positive charge, with these particles then undergoing <a href="/wiki/Flocculation" title="Flocculation">flocculation</a> with the harmful algae cells. The algae cells then group together: becoming a <a href="/wiki/Sediment" title="Sediment">sediment</a> instead of a <a href="/wiki/Suspension_(chemistry)" title="Suspension (chemistry)">suspension</a>. The process of flocculation will limit the bloom growth and reduce the impact in which the bloom can have on an area.<a href="#cite_note-196">[196]</a> In the Netherlands, successful algae and phosphate removal from surface water has been obtained by pumping affected water through a hydrodynamic separator. The treated water is then free from algae and contains a significant lower amount of phosphate since the removed algae cells contain a lot of phosphate. The treated water also gets a lower turbidity. Future projects will study the positive effects on the ecology and marine life as it is expected plant life will be restored and a reduction in bottom dwelling fish will automatically reduce the turbidity of the cleaned water. The removed algae and phosphate may find its way not as waste but as infeed to bio digesters. <div class="mw-heading mw-heading3"><h3 id="Additional_reservoirs">Additional reservoirs</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=34" title="Edit section: Additional reservoirs">edit</a>]</div> Other experts have proposed building reservoirs to prevent the movement of algae downstream. However, that can lead to the growth of algae within the reservoir, which become sediment traps with a resultant buildup of nutrients.<a href="#cite_note-Greensburg-190">[190]</a> Some researchers found that intensive blooms in reservoirs were the primary source of toxic algae observed downstream, but the movement of algae has so far been less studied, although it is considered a likely cause of algae transport.<a href="#cite_note-OSU-192">[192]</a><a href="#cite_note-197">[197]</a> <div class="mw-heading mw-heading3"><h3 id="Restoring_shellfish_populations">Restoring shellfish populations</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=35" title="Edit section: Restoring shellfish populations">edit</a>]</div> The decline of filter-feeding shellfish populations, such as <a href="/wiki/Oysters" class="mw-redirect" title="Oysters">oysters</a>, likely contribute to HAB occurrence.<a href="#cite_note-198">[198]</a> As such, numerous research projects are assessing the potential of restored shellfish populations to reduce HAB occurrence.<a href="#cite_note-199">[199]</a><a href="#cite_note-200">[200]</a><a href="#cite_note-201">[201]</a> <div class="mw-heading mw-heading3"><h3 id="Improved_monitoring">Improved monitoring</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=36" title="Edit section: Improved monitoring">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1237032888/mw-parser-output/.tmulti"><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:304px;max-width:304px"><div class="trow"><div class="tsingle" style="width:302px;max-width:302px"><div class="thumbimage"><video id="mwe_player_2" poster="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Super_Blooms.ogv/300px--Super_Blooms.ogv.jpg" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="300" height="169" data-durationhint="62" data-mwtitle="Super_Blooms.ogv" data-mwprovider="wikimediacommons"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/a/a4/Super_Blooms.ogv/Super_Blooms.ogv.480p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="480p.vp9.webm" data-width="854" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/a/a4/Super_Blooms.ogv" type="video/ogg; codecs="theora, vorbis"" data-width="960" data-height="540" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/a/a4/Super_Blooms.ogv/Super_Blooms.ogv.240p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="240p.vp9.webm" data-width="426" data-height="240" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/a/a4/Super_Blooms.ogv/Super_Blooms.ogv.360p.webm" type="video/webm; codecs="vp8, vorbis"" data-transcodekey="360p.webm" data-width="640" data-height="360" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/a/a4/Super_Blooms.ogv/Super_Blooms.ogv.360p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="360p.vp9.webm" data-width="640" data-height="360" /></video></div><div class="thumbcaption">Algal blooms forming and breaking up over time</div></div></div></div></div> Other remedies include using improved monitoring methods, trying to improve predictability, and testing new potential methods of controlling HABs.<a href="#cite_note-US-73">[73]</a> Some countries surrounding the Baltic Sea, which has the world's largest dead zone, have considered using massive geoengineering options, such as forcing air into bottom layers to aerate them.<a href="#cite_note-SciAm2-125">[125]</a> Mathematical models are useful to predict future algal blooms.<a href="#cite_note-Janssen-et-al-2019-45">[45]</a> <div class="mw-heading mw-heading4"><h4 id="Sensors_and_monitoring_devices">Sensors and monitoring devices</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=37" title="Edit section: Sensors and monitoring devices">edit</a>]</div> A growing number of scientists agree that there is an urgent need to protect the public by being able to forecast harmful algal blooms.<a href="#cite_note-NYT-Richtel-202">[202]</a> One way they hope to do that is with sophisticated sensors which can help warn about potential blooms.<a href="#cite_note-203">[203]</a> The same types of sensors can also be used by water treatment facilities to help them prepare for higher toxic levels.<a href="#cite_note-NYT-Richtel-202">[202]</a><a href="#cite_note-204">[204]</a> The only sensors now in use are located in the Gulf of Mexico. In 2008 similar sensors in the Gulf forewarned of an increased level of toxins that led to a shutdown of shellfish harvesting in Texas along with a recall of mussels, clams, and oysters, possibly saving many lives. With an increase in the size and frequency of HABs, experts state the need for significantly more sensors located around the country.<a href="#cite_note-NYT-Richtel-202">[202]</a> The same kinds of sensors can also be used to detect threats to drinking water from intentional contamination.<a href="#cite_note-205">[205]</a> Satellite and remote sensing technologies are growing in importance for monitoring, tracking, and detecting HABs.<a href="#cite_note-206">[206]</a><a href="#cite_note-207">[207]</a><a href="#cite_note-208">[208]</a><a href="#cite_note-209">[209]</a> Four U.S. federal agencies—EPA, the <a href="/wiki/National_Aeronautics_and_Space_Administration" class="mw-redirect" title="National Aeronautics and Space Administration">National Aeronautics and Space Administration</a> (NASA), NOAA, and the <a href="/wiki/U.S._Geological_Survey" class="mw-redirect" title="U.S. Geological Survey">U.S. Geological Survey</a> (USGS)—are working on ways to detect and measure cyanobacteria blooms using satellite data.<a href="#cite_note-210">[210]</a> The data may help develop early-warning indicators of cyanobacteria blooms by monitoring both local and national coverage.<a href="#cite_note-satellite-211">[211]</a> In 2016 automated early-warning monitoring systems were successfully tested, and for the first time proven to identify the rapid growth of algae and the subsequent depletion of oxygen in the water.<a href="#cite_note-212">[212]</a> <div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=38" title="Edit section: Examples">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Notable_occurrences">Notable occurrences</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=39" title="Edit section: Notable occurrences">edit</a>]</div> <ul><li>1530: First alleged case off the <a href="/wiki/Florida" title="Florida">Florida</a> Gulf Coast is without foundation.<a href="#cite_note-213">[213]</a> According to Marine Lab at University of Miami, the first possible Red Tide in Florida was in 1844. Earlier "signs" were from boats sorting fish on their way to home port dumping trash fish overboard. Thus "dead fish" reports along the coast were not Red Tide.<a href="#cite_note-Log_In_or_Sign_Up_to_View-214">[214]</a></li> <li>1793: The first recorded case occurring in <a href="/wiki/British_Columbia" title="British Columbia">British Columbia</a>, <a href="/wiki/Canada" title="Canada">Canada</a>.<a href="#cite_note-GoogleDocs-215">[215]</a></li> <li>1840: No deaths of humans have been attributed to Florida red tide, but people may experience respiratory irritation (coughing, sneezing, and tearing) when the red tide organism (Karenia brevis) is present along a coast and winds blow its aerosolized toxins. Swimming is usually safe, but skin irritation and burning is possible in areas of high concentration of red tide.<a href="#cite_note-216">[216]</a></li> <li>1844: First possible case off the Florida Gulf Coast according to Marine Lab University of Miami, probably by ships off shore, no known inhabitants of the coast reporting.<a href="#cite_note-Log_In_or_Sign_Up_to_View-214">[214]</a></li> <li>1901: <a href="/wiki/Lingulodinium_polyedrum" class="mw-redirect" title="Lingulodinium polyedrum">Lingulodinium polyedrum</a> produces brilliant displays of bioluminescence in warm coastal waters. Seen in <a href="/wiki/Southern_California" title="Southern California">Southern California</a> regularly since at least 1901.<a href="#cite_note-217">[217]</a></li> <li>1916: Massive fish kill along SW Florida coast. Noxious air thought to be seismic underwater explosion releasing chlorine gas.<a href="#cite_note-218">[218]</a></li> <li>1947: Southwest Florida: A massive bloom that lasts close a year almost destroys the commercial fishing industry and sponge beds. The resulting poisoned surf caused beaches to need to be evacuated.<a href="#cite_note-219">[219]</a></li> <li>1972: A red tide was caused in New England by a toxic dinoflagellate Alexandrium (Gonyaulax) tamarense. The red tides caused by the dinoflagellate <a href="/wiki/Gonyaulax" title="Gonyaulax">Gonyaulax</a> are serious because this organism produces saxitoxin and gonyautoxins which accumulate in shellfish and if ingested may lead to <a href="/wiki/Paralytic_shellfish_poisoning" title="Paralytic shellfish poisoning">paralytic shellfish poisoning (PSP)</a> and can lead to death.<a href="#cite_note-220">[220]</a></li> <li>1972 and 1973: Red tides killed two villagers west of Port Moresby. In March 1973 a red tide invaded Port Moresby Harbour and destroyed a Japanese pearl farm.<a href="#cite_note-MacLean_74-221">[221]</a></li> <li>In 1972, a red tide was caused in <a href="/wiki/New_England" title="New England">New England</a> by a toxic dinoflagellate <a href="/wiki/Alexandrium_tamarense" title="Alexandrium tamarense">Alexandrium (Gonyaulax) tamarense</a>.<a href="#cite_note-222">[222]</a></li> <li>1976: The first PSP case in <a href="/wiki/Sabah" title="Sabah">Sabah</a>, <a href="/wiki/East_Malaysia" title="East Malaysia">Malaysian Borneo</a> where 202 victims were reported to be suffering and 7 deaths.<a href="#cite_note-GoogleDocs-215">[215]</a><a href="#cite_note-nst.com.my-223">[223]</a><a href="#cite_note-dailyexpress.com.my-224">[224]</a></li> <li>1987: A red algae bloom in <a href="/wiki/Prince_Edward_Island" title="Prince Edward Island">Prince Edward Island</a> caused over a million dollars in losses.<a href="#cite_note-225">[225]</a></li> <li>1991: The largest algal bloom on record was the <a href="/wiki/1991_Darling_River_cyanobacterial_bloom" title="1991 Darling River cyanobacterial bloom">1991 Darling River cyanobacterial bloom</a> in Australia, largely of <a href="/wiki/Anabaena_circinalis" title="Anabaena circinalis">Anabaena circinalis</a>, between October and December 1991 over 1,000 kilometres (620 mi) of the <a href="/wiki/Barwon_River_(New_South_Wales)" title="Barwon River (New South Wales)">Barwon</a> and <a href="/wiki/Darling_River" title="Darling River">Darling Rivers</a>.<a href="#cite_note-226">[226]</a></li> <li>2005: The Canadian red tide was discovered to have come further south than it has in years prior by the ship (R/V) Oceanus,<a href="#cite_note-227">[227]</a> closing shellfish beds in Maine and Massachusetts and alerting authorities as far south as <a href="/wiki/Montauk,_New_York" title="Montauk, New York">Montauk</a> (<a href="/wiki/Long_Island" title="Long Island">Long Island</a>, NY) to check their beds.<a href="#cite_note-228">[228]</a> Experts who discovered the reproductive cysts in the seabed warn of a possible spread to Long Island in the future, halting the area's fishing and shellfish industry and threatening the tourist trade, which constitutes a significant portion of the island's economy.</li> <li>In 2008 large blooms of the algae Cochlodinium polykrikoid were found along the Chesapeake Bay and nearby tributaries such as the James River, causing millions of dollars in damage and numerous beach closures.<a href="#cite_note-Morse_1006–10252-68">[68]</a></li> <li>In 2009, <a href="/wiki/Brittany" title="Brittany">Brittany, France</a> experienced recurring macroalgal blooms caused by the high amount of fertilizer discharging in the sea due to <a href="/wiki/Intensive_pig_farming" title="Intensive pig farming">intensive pig farming</a>, causing lethal gas emissions that have led to one case of human unconsciousness and three animal deaths.<a href="#cite_note-229">[229]</a></li> <li>In 2010, dissolved iron in the ash from the <a href="/wiki/Eyjafjallaj%C3%B6kull" title="Eyjafjallajökull">Eyjafjallajökull</a> volcano triggered a plankton bloom in the <a href="/wiki/North_Atlantic" class="mw-redirect" title="North Atlantic">North Atlantic</a>.<a href="#cite_note-230">[230]</a></li> <li>2011: Northern California<a href="#cite_note-231">[231]</a></li> <li>2011: <a href="/wiki/Gulf_of_Mexico" title="Gulf of Mexico">Gulf of Mexico</a><a href="#cite_note-232">[232]</a></li> <li>In 2013, an algal bloom was caused in <a href="/wiki/Qingdao" title="Qingdao">Qingdao</a>, <a href="/wiki/China" title="China">China</a>, by <a href="/wiki/Sea_lettuce" title="Sea lettuce">sea lettuce</a>.<a href="#cite_note-233">[233]</a></li> <li>2013: In January, a red tide occurred again on the <a href="/wiki/West_Coast_Division" title="West Coast Division">West Coast</a> <a href="/wiki/South_China_Sea" title="South China Sea">Sea</a> of <a href="/wiki/Sabah" title="Sabah">Sabah</a> in the <a href="/wiki/East_Malaysia" title="East Malaysia">Malaysian Borneo</a>.<a href="#cite_note-nst.com.my-223">[223]</a><a href="#cite_note-thestar.com.my-234">[234]</a> Two human fatalities were reported after they consumed <a href="/wiki/Shellfish" title="Shellfish">shellfish</a> contaminated with the <a href="/wiki/Shellfish_poisoning" title="Shellfish poisoning">red tide toxin</a>.<a href="#cite_note-nst.com.my-223">[223]</a><a href="#cite_note-dailyexpress.com.my-224">[224]</a><a href="#cite_note-thestar.com.my-234">[234]</a></li> <li>2013: In January, a red tide bloom appeared at Sarasota beach – mainly Siesta Key, Florida causing a fish kill that had a negative impact on tourists, and caused respiratory issues for beach-goers.<a href="#cite_note-235">[235]</a></li> <li>In 2014, <a href="/wiki/Myrionecta_rubra" class="mw-redirect" title="Myrionecta rubra">Myrionecta rubra</a> (previously known as Mesodinium rubrum), a <a href="/wiki/Ciliate" title="Ciliate">ciliate</a> protist that ingests <a href="/wiki/Cryptomonad" title="Cryptomonad">cryptomonad</a> algae, caused a bloom in southeastern coast of <a href="/wiki/Brazil" title="Brazil">Brazil</a>.<a href="#cite_note-236">[236]</a></li> <li>In 2014, blue green algae caused a bloom in the western basin of <a href="/wiki/Lake_Erie" title="Lake Erie">Lake Erie</a>, poisoning the <a href="/wiki/Toledo,_Ohio" title="Toledo, Ohio">Toledo, Ohio</a> water system connected to 500,000 people.<a href="#cite_note-237">[237]</a></li> <li>2014: In August, massive 'Florida red tide' 90 miles (140 km) long and 60 miles (97 km) wide.<a href="#cite_note-Florida22-238">[238]</a></li> <li>2015: June, 12 persons hospitalized in the Philippine province of <a href="/wiki/Bohol" title="Bohol">Bohol</a> for red tide poisoning.<a href="#cite_note-239">[239]</a></li> <li>2015: August, several beaches in the Netherlands between <a href="/wiki/Katwijk" title="Katwijk">Katwijk</a> and <a href="/wiki/Scheveningen" title="Scheveningen">Scheveningen</a> were plagued. Government institutions dissuaded swimmers from entering the water.<a href="#cite_note-Netherlands-240">[240]</a></li> <li>2015: September, a red tide bloom occurred in the Gulf of Mexico, affecting <a href="/wiki/Padre_Island_National_Seashore" title="Padre Island National Seashore">Padre Island National Seashore</a> along <a href="/wiki/North_Padre_Island" title="North Padre Island">North Padre Island</a> and <a href="/wiki/South_Padre_Island" title="South Padre Island">South Padre Island</a> in Texas.<a href="#cite_note-Texas-241">[241]</a></li> <li>2017 and 2018: K. brevis red tide algae with warnings not to swim, state of emergency declared, dead <a href="/wiki/Dolphin" title="Dolphin">dolphin</a> and <a href="/wiki/Manatee" title="Manatee">manatee</a>, worsened by <a href="/wiki/Caloosahatchee_River" title="Caloosahatchee River">Caloosahatchee River</a>. Peaked in the summer of 2018. Toxic harmful algae bloom red tide in Southwest Florida.<a href="#cite_note-242">[242]</a><a href="#cite_note-243">[243]</a><a href="#cite_note-244">[244]</a> A rare harmful algal bloom along Florida's east coast of <a href="/wiki/Palm_Beach_County,_Florida" title="Palm Beach County, Florida">Palm Beach County</a> occurred the weekend of September 30, 2018.<a href="#cite_note-245">[245]</a></li> <li>In 2019, blue-green algae, or <a href="/wiki/Cyanobacteria" title="Cyanobacteria">Cyanobacteria</a> blooms,<a href="#cite_note-246">[246]</a> were again problematic on Lake Erie. In early August 2019, satellite images depicted a bloom stretching up to 1,300 square kilometers, with the epicentre near <a href="/wiki/Toledo,_Ohio" title="Toledo, Ohio">Toledo, Ohio</a>.<a href="#cite_note-uwindsor.ca-247">[247]</a> The largest Lake Erie bloom to date occurred in 2015, exceeding the severity index at 10.5 and in 2011 at a 10.<a href="#cite_note-Windsor_Star_-_Hill-248">[248]</a> A large bloom does not necessarily mean the cyanobacteria ... will produce toxins", said Michael McKay, of the <a href="/wiki/University_of_Windsor" title="University of Windsor">University of Windsor</a>. Water quality testing was underway in August.<a href="#cite_note-uwindsor.ca-247">[247]</a><a href="#cite_note-Windsor_Star_-_Hill-248">[248]</a></li> <li>In 2019, a bloom of <a href="/wiki/Noctiluca_scintillans" title="Noctiluca scintillans">Noctiluca</a> algae caused <a href="/wiki/Milky_seas_effect" title="Milky seas effect">bioluminescent glow</a> off the coast of Chennai, India. Similar blooms have been reported annually in the northern <a href="/wiki/Arabian_Sea" title="Arabian Sea">Arabian Sea</a> since the early 2000s.<a href="#cite_note-249">[249]</a></li> <li>2021: In July, a large red tide occurred on the <a href="/wiki/Gulf_Coast_of_the_United_States" title="Gulf Coast of the United States">Gulf Coast</a> of Florida in and around <a href="/wiki/Tampa_Bay" title="Tampa Bay">Tampa Bay</a>. The event has caused the death of millions of pounds of fish,<a href="#cite_note-250">[250]</a> and led to the National Weather Service declaring a Beach Hazard.<a href="#cite_note-251">[251]</a></li> <li>2021: in October, the <a href="/wiki/2021_North-East_England_shellfish_die-off" title="2021 North-East England shellfish die-off">mass deaths of shellfish</a> (specifically crabs and lobster) on the beaches of Northern England, led to and algal bloom being blamed as the cause by the UK Government. However, those who work in the fishing industry in the area, and some academics, have stated that pyridine poisoning is the cause.<a href="#cite_note-252">[252]</a><a href="#cite_note-253">[253]</a></li> <li>2023: A blue-green algae bloom occurred in <a href="/wiki/Lough_Neagh" title="Lough Neagh">Lough Neagh</a>, <a href="/wiki/Northern_Ireland" title="Northern Ireland">Northern Ireland</a>, the largest fresh water lake in the <a href="/wiki/UK" class="mw-redirect" title="UK">UK</a> and <a href="/wiki/Ireland" title="Ireland">Ireland</a> where 40% of Northern Ireland gets its tap water from. It is caused by <a href="/wiki/Northern_Ireland" title="Northern Ireland">Northern Ireland</a> experiencing both the wettest and hottest summer on record making conditions perfect for blue-green algae. Poor management of the Lough is being blamed. The bloom has killed dogs and wildlife, including swans.<a href="#cite_note-254">[254]</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="United_States">United States</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=40" title="Edit section: United States">edit</a>]</div> In July 2016 <a href="/wiki/Florida" title="Florida">Florida</a> declared a <a href="/wiki/State_of_emergency" title="State of emergency">state of emergency</a> for four counties as a result of blooms. They were said to be "destroying" a number of businesses and affecting local economies, with many needing to shut down entirely.<a href="#cite_note-255">[255]</a> Some beaches were closed, and hotels and restaurants suffered a drop in business. Tourist sporting activities such as fishing and boating were also affected.<a href="#cite_note-256">[256]</a><a href="#cite_note-Florida2-257">[257]</a> In 2019, the biggest <a href="/wiki/Sargassum" title="Sargassum">Sargassum</a> bloom ever seen created a crisis in the <a href="/wiki/Tourism_industry" class="mw-redirect" title="Tourism industry">Tourism industry</a> in <a href="/wiki/North_America" title="North America">North America</a>. This event was likely caused by climate change and <a href="/wiki/Nutrient_pollution" title="Nutrient pollution">nutrient pollution</a> from <a href="/wiki/Fertilizers" class="mw-redirect" title="Fertilizers">fertilizers</a>.<a href="#cite_note-258">[258]</a> Several Caribbean countries considered declaring a state of emergency due to the impact on tourism as a result of environmental damage and potentially toxic and harmful health effects.<a href="#cite_note-259">[259]</a> <div class="mw-heading mw-heading4"><h4 id="On_the_U.S._coasts">On the U.S. coasts</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=41" title="Edit section: On the U.S. coasts">edit</a>]</div> The <a href="/wiki/Gulf_of_Maine" title="Gulf of Maine">Gulf of Maine</a> frequently experiences blooms of the <a href="/wiki/Dinoflagellate" title="Dinoflagellate">dinoflagellate</a> <a href="/wiki/Alexandrium_fundyense" title="Alexandrium fundyense">Alexandrium fundyense</a>, an organism that produces <a href="/wiki/Saxitoxin" title="Saxitoxin">saxitoxin</a>, the neurotoxin responsible for <a href="/wiki/Paralytic_shellfish_poisoning" title="Paralytic shellfish poisoning">paralytic shellfish poisoning</a>. The well-known "Florida red tide" that occurs in the Gulf of Mexico is a HAB caused by <a href="/wiki/Karenia_brevis" title="Karenia brevis">Karenia brevis</a>, another dinoflagellate which produces brevetoxin, the neurotoxin responsible for <a href="/wiki/Neurotoxic_shellfish_poisoning" title="Neurotoxic shellfish poisoning">neurotoxic shellfish poisoning</a>. California coastal waters also experience seasonal blooms of <a href="/wiki/Pseudo-nitzschia" title="Pseudo-nitzschia">Pseudo-nitzschia</a>, a <a href="/wiki/Diatom" title="Diatom">diatom</a> known to produce <a href="/wiki/Domoic_acid" title="Domoic acid">domoic acid</a>, the neurotoxin responsible for <a href="/wiki/Amnesic_shellfish_poisoning" title="Amnesic shellfish poisoning">amnesic shellfish poisoning</a>. <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Red_tide%EF%BC%BF2017.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Red_tide%EF%BC%BF2017.jpg/260px-Red_tide%EF%BC%BF2017.jpg" decoding="async" width="260" height="195" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Red_tide%EF%BC%BF2017.jpg/390px-Red_tide%EF%BC%BF2017.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/Red_tide%EF%BC%BF2017.jpg/520px-Red_tide%EF%BC%BF2017.jpg 2x" data-file-width="2048" data-file-height="1536" /></a><figcaption> Marine harmful algal bloom in a harbor, <a href="/wiki/Japan" title="Japan">Japan</a></figcaption></figure> The term red tide is most often used in the US to refer to <a href="/wiki/Karenia_brevis" title="Karenia brevis">Karenia brevis</a> blooms in the eastern <a href="/wiki/Gulf_of_Mexico" title="Gulf of Mexico">Gulf of Mexico</a>, also called the Florida red tide. K. brevis is one of many different species of the genus Karenia found in the world's oceans. <a href="#cite_note-Fleming,_L._E._2011-260">[260]</a> Major advances have occurred in the study of dinoflagellates and their genomics. Some include identification of the toxin-producing genes (<a href="/wiki/Polyketide_synthase" title="Polyketide synthase">PKS</a> genes), exploration of environmental changes (temperature, light/dark, etc.) have on gene expression, as well as an appreciation of the complexity of the Karenia genome.<a href="#cite_note-Fleming,_L._E._2011-260">[260]</a> These blooms have been documented since the 1800s, and occur almost annually along Florida's coasts.<a href="#cite_note-Fleming,_L._E._2011-260">[260]</a> There was increased research activity of harmful algae blooms (HABs) in the 1980s and 1990s. This was primarily driven by media attention from the discovery of new HAB organisms and the potential adverse health effects of their exposure to animals and humans.<a href="#cite_note-261">[261]</a>[<a href="/wiki/Wikipedia:Citing_sources#What_information_to_include" title="Wikipedia:Citing sources">full citation needed</a>] The Florida red tides have been observed to have spread as far as the eastern coast of Mexico.<a href="#cite_note-Fleming,_L._E._2011-260">[260]</a> The density of these organisms during a bloom can exceed tens of millions of cells per litre of seawater, and often discolor the water a deep reddish-brown hue. Red tide is also sometimes used to describe harmful algal blooms on the northeast coast of the United States, particularly in the <a href="/wiki/Gulf_of_Maine" title="Gulf of Maine">Gulf of Maine</a>. This type of bloom is caused by another species of dinoflagellate known as <a href="/wiki/Alexandrium_fundyense" title="Alexandrium fundyense">Alexandrium fundyense</a>. These blooms of organisms cause severe disruptions in <a href="/wiki/Fishery" title="Fishery">fisheries</a> of these waters, as the toxins in these organism cause filter-feeding shellfish in affected waters to become poisonous for human consumption due to saxitoxin.<a href="#cite_note-262">[262]</a> The related <a href="/wiki/Alexandrium_monilatum" title="Alexandrium monilatum">Alexandrium monilatum</a> is found in subtropical or tropical shallow seas and <a href="/wiki/Estuary" title="Estuary">estuaries</a> in the western <a href="/wiki/Atlantic_Ocean" title="Atlantic Ocean">Atlantic Ocean</a>, the <a href="/wiki/Caribbean_Sea" title="Caribbean Sea">Caribbean Sea</a>, the Gulf of Mexico, and the eastern <a href="/wiki/Pacific_Ocean" title="Pacific Ocean">Pacific Ocean</a>. <div class="mw-heading mw-heading4"><h4 id="Texas">Texas</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=42" title="Edit section: Texas">edit</a>]</div> Natural water reservoirs in <a href="/wiki/Texas" title="Texas">Texas</a> have been threatened by anthropogenic activities due to large petroleum refineries and oil wells (i.e. emission and wastewater discharge), massive agricultural activities (i.e. pesticide release) and mining extractions (i.e. toxic wastewater) as well as natural phenomena involving frequent HAB events. For the first time in 1985, the state of Texas documented the presence of the P. parvum (golden alga) bloom along the <a href="/wiki/Pecos_River" title="Pecos River">Pecos River</a>. This phenomenon has affected 33 reservoirs in Texas along major river systems, including the Brazos, Canadian, Rio Grande, Colorado, and Red River, and has resulted in the death of more than 27 million fish and caused tens of millions of dollars in damage.<a href="#cite_note-263">[263]</a> <div class="mw-heading mw-heading4"><h4 id="Chesapeake_Bay">Chesapeake Bay</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=43" title="Edit section: Chesapeake Bay">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:July_12,_2013_-_Sassafras_River,_VA_Algal_Bloom_(9321804011).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg/220px-July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg/330px-July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ac/July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg/440px-July_12%2C_2013_-_Sassafras_River%2C_VA_Algal_Bloom_%289321804011%29.jpg 2x" data-file-width="1600" data-file-height="1064" /></a><figcaption>An algal bloom on the <a href="/wiki/Sassafras_River" title="Sassafras River">Sassafras River</a>, a tributary of the Chesapeake Bay</figcaption></figure> The <a href="/wiki/Chesapeake_Bay" title="Chesapeake Bay">Chesapeake Bay</a>, the largest <a href="/wiki/Estuary" title="Estuary">estuary</a> in the U.S., has suffered from repeated large algal blooms for decades due to chemical runoff from multiple sources,<a href="#cite_note-264">[264]</a> including 9 large rivers and 141 smaller streams and creeks in parts of six states. In addition, the water is quite shallow and only 1% of the waste entering it gets flushed into the ocean.<a href="#cite_note-Miller-51">[51]</a> By weight, 60% of the phosphates entering the bay in 2003 were from sewage treatment plants, while 60% of its nitrates came from fertilizer runoff, farm animal waste, and the atmosphere.<a href="#cite_note-Miller-51">[51]</a> About 300 million pounds (140 Gg) of nitrates are added to the bay each year.<a href="#cite_note-265">[265]</a> The population increase in the bay <a href="/wiki/Drainage_basin" title="Drainage basin">watershed</a>, from 3.7 million people in 1940 to 18 million in 2015 is also a major factor,<a href="#cite_note-Miller-51">[51]</a> as economic growth leads to the increased use of fertilizers and rising emissions of industrial waste.<a href="#cite_note-266">[266]</a><a href="#cite_note-267">[267]</a> As of 2015, the six states and the local governments in the Chesapeake watershed have upgraded their sewage treatment plants to control nutrient discharges. The <a href="/wiki/U.S._Environmental_Protection_Agency" class="mw-redirect" title="U.S. Environmental Protection Agency">U.S. Environmental Protection Agency</a> (EPA) estimates that sewage treatment plant improvements in the Chesapeake region between 1985 and 2015 have prevented the discharge of 900 million pounds (410 Gg) of nutrients, with nitrogen discharges reduced by 57% and phosphorus by 75%.<a href="#cite_note-EPA-Chesapeake_Pollution-268">[268]</a> Agricultural and urban runoff pollution continue to be major sources of nutrients in the bay, and efforts to manage those problems are continuing throughout the 64,000 square miles (170,000 km2) watershed.<a href="#cite_note-269">[269]</a> <div class="mw-heading mw-heading4"><h4 id="Lake_Erie">Lake Erie</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=44" title="Edit section: Lake Erie">edit</a>]</div> Recent algae blooms in Lake Erie have been fed primarily by agricultural runoff and have led to warnings for some people in Canada and Ohio not to drink their water.<a href="#cite_note-270">[270]</a><a href="#cite_note-271">[271]</a> The <a href="/wiki/International_Joint_Commission" title="International Joint Commission">International Joint Commission</a> has called on United States and Canada to drastically reduce phosphorus loads into Lake Erie to address the threat.<a href="#cite_note-272">[272]</a><a href="#cite_note-273">[273]</a><a href="#cite_note-274">[274]</a> <div class="mw-heading mw-heading4"><h4 id="Green_Bay">Green Bay</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=45" title="Edit section: Green Bay">edit</a>]</div> Green Bay has a dead zone caused by phosphorus pollution that appears to be getting worse.<a href="#cite_note-275">[275]</a> <div class="mw-heading mw-heading4"><h4 id="Okeechobee_Waterway">Okeechobee Waterway</h4>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=46" title="Edit section: Okeechobee Waterway">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Cropped_lake_okeechobee_oli_2016184_lrg.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Cropped_lake_okeechobee_oli_2016184_lrg.jpg/220px-Cropped_lake_okeechobee_oli_2016184_lrg.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Cropped_lake_okeechobee_oli_2016184_lrg.jpg/330px-Cropped_lake_okeechobee_oli_2016184_lrg.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Cropped_lake_okeechobee_oli_2016184_lrg.jpg/440px-Cropped_lake_okeechobee_oli_2016184_lrg.jpg 2x" data-file-width="3916" data-file-height="3916" /></a><figcaption>Harmful algal bloom (<a href="/wiki/Cyanobacteria" title="Cyanobacteria">cyanobacteria</a>) on <a href="/wiki/Lake_Okeechobee" title="Lake Okeechobee">Lake Okeechobee</a> in 2016. </figcaption></figure> <a href="/wiki/Lake_Okeechobee" title="Lake Okeechobee">Lake Okeechobee</a> is an ideal habitat for cyanobacteria because its shallow, sunny, and laden with nutrients from Florida's agriculture.<a href="#cite_note-276">[276]</a> The <a href="/wiki/Okeechobee_Waterway" title="Okeechobee Waterway">Okeechobee Waterway</a> connects the lake to the <a href="/wiki/Atlantic_Ocean" title="Atlantic Ocean">Atlantic Ocean</a> and the <a href="/wiki/Gulf_of_Mexico" title="Gulf of Mexico">Gulf of Mexico</a> through the <a href="/wiki/St._Lucie_River" title="St. Lucie River">St. Lucie River</a> and the <a href="/wiki/Caloosahatchee_River" title="Caloosahatchee River">Caloosahatchee</a> respectively. This means that harmful algal blooms are carried down the estuaries as water is released during the wet summer months. In July 2018 up to 90% of Lake Okeechobee was covered in algae.<a href="#cite_note-277">[277]</a><a href="#cite_note-278">[278]</a> Water draining from the lake filled the region with a noxious odor and caused respiratory problems in some humans during the following month.<a href="#cite_note-279">[279]</a> To make matters worse, harmful red tide blooms are historically common on Florida's coasts during these same summer months.<a href="#cite_note-:1-280">[280]</a> Cyanobacteria in the rivers die as they reach saltwater but their nitrogen fixation feeds the red tide on the coast.<a href="#cite_note-:1-280">[280]</a> Areas at the mouth of the estuaries such as <a href="/wiki/Cape_Coral,_Florida" title="Cape Coral, Florida">Cape Coral</a> and <a href="/wiki/Port_St._Lucie,_Florida" title="Port St. Lucie, Florida">Port St. Lucie</a> therefore experience the compounded effects of both types of harmful algal bloom. Cleanup crews hired by authorities in <a href="/wiki/Lee_County,_Florida" title="Lee County, Florida">Lee County</a> - where the Caloosahatchee meets the Gulf of Mexico - removed more than 1700 tons of dead marine life in August 2018.<a href="#cite_note-281">[281]</a> <div class="mw-heading mw-heading3"><h3 id="Baltic_Sea">Baltic Sea</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=47" title="Edit section: Baltic Sea">edit</a>]</div> In 2020, a large harmful algal bloom closed beaches in Poland and Finland, brought on by a combination of fertilizer runoff and extreme heat, posing a risk to flounder and mussel beds.<a href="#cite_note-282">[282]</a><a href="#cite_note-283">[283]</a> This is seen by the <a href="/wiki/Baltic_Sea_Action_Group" title="Baltic Sea Action Group">Baltic Sea Action Group</a> as a threat to biodiversity and regional fishing stocks.<a href="#cite_note-284">[284]</a> <div class="mw-heading mw-heading3"><h3 id="Coastal_seas_of_Bangladesh,_India,_and_Pakistan">Coastal seas of Bangladesh, India, and Pakistan</h3>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=48" title="Edit section: Coastal seas of Bangladesh, India, and Pakistan">edit</a>]</div> <a href="/wiki/Open_defecation" title="Open defecation">Open defecation</a> is common in south Asia, but human waste is an often overlooked source of nutrient pollution in marine pollution modeling. When nitrogen (N) and phosphorus (P) contributed by human waste was included in models for Bangladesh, India, and Pakistan, the estimated N and P inputs to bodies of water increased one to two orders of magnitude compared to previous models.<a href="#cite_note-:0-47">[47]</a> River export of nutrients to coastal seas increases coastal <a href="/wiki/Eutrophication" title="Eutrophication">eutrophication</a> potential (ICEP). The ICEP of the <a href="/wiki/Godavari_River" title="Godavari River">Godavari River</a> is three times higher when N and P inputs from human waste are included. <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=49" title="Edit section: See also">edit</a>]</div> <ul><li><a href="/wiki/Brevetoxin" title="Brevetoxin">Brevetoxin</a></li> <li><a href="/wiki/Ciguatera" class="mw-redirect" title="Ciguatera">Ciguatera</a></li> <li><a href="/wiki/Cyanobacterial_bloom" class="mw-redirect" title="Cyanobacterial bloom">Cyanobacterial bloom</a></li> <li><a href="/wiki/Cyanotoxin" title="Cyanotoxin">Cyanotoxin</a></li> <li><a href="/wiki/GEOHAB" title="GEOHAB">GEOHAB</a> - an international research programme on the Global Ecology and Oceanography of Harmful algal blooms</li> <li><a href="/wiki/Milky_seas_effect" title="Milky seas effect">Milky seas effect</a> – A phenomenon in which disturbed red algae dinoflagellates will make the water glow blue, at night</li> <li><a href="/wiki/Pfiesteria" title="Pfiesteria">Pfiesteria</a></li> <li><a href="/wiki/Thin_layers_(oceanography)" title="Thin layers (oceanography)">Thin layers (oceanography)</a></li> <li><a href="/wiki/Water_quality" title="Water quality">Water quality</a></li> <li><a href="/wiki/Water_security" title="Water security">Water security</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2>[<a href="/w/index.php?title=Harmful_algal_bloom&action=edit&section=50" title="Edit section: References">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-:4-1">^ <a href="#cite_ref-:4_1-0">a</a> <a href="#cite_ref-:4_1-1">b</a> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFJ._HeislerP.M._GlibertJ.M._BurkholderD.M._Anderson2008" class="citation journal cs1">J. 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