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Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea
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{"work":{"id":5409506,"created_at":"2013-12-12T19:48:22.321-08:00","from_world_paper_id":121410577,"updated_at":"2024-11-16T21:10:49.887-08:00","_data":{"grobid_abstract":"Black reduced sediment surfaces (Black Spots) in sandy intertidal flats of the German Wadden Sea (southern North Sea) are characterised by elevated sulphide concentrations (up to 20 mM) and low redox potentials. It is assumed that the appearance of Black Spots is linked to elevated levels of organic matter content within the sediments. In order to establish the effect of high substrate and sulphide concentrations on the heterotrophic microbial communities in Black Spot sediments, bacterial abundances and the potential C-source utilisation patterns of microbial communities were compared in natural and artificially induced Black Spots and unaffected control sites. Bacterial numbers were estimated by direct counts and the most probable number technique for different physiological groups, while patterns of C-substrate utilisation of entire aerobic microbial communities were assessed using the Biolog1 sole-carbon-sourcecatabolism assay. Bacterial abundances at Black Spot sites were increased, with increases in mean cell numbers, more disperse data distributions and more extreme values. Substrate utilisation patterns of aerobic microbial communities were significantly different in Black Spot sediment slurries, showing diminished richness (number of C-sources catabolised) and substrate diversity (Shannon diversity index) in comparison to unaffected sites. Principal component analysis clearly discriminated Black Spot utilisation patterns from controls and indicated that microbial communities in individual Black Spot sites are functionally diverse and differ from communities in oxidised surface sediments and reduced subsurface sediments at control sites. This work suggests that potentially negative effects on microbial communities in Black Spot sediments, through anoxia and high sulphide concentrations, are balanced by the stimulating influence of substrate availability, leading to comparable or higher bacterial numbers, but lower functional microbial diversity of aerobic microbial communities.","publication_date":"2003,,","publication_name":"Fems Microbiology Ecology","grobid_abstract_attachment_id":"49303578"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea","broadcastable":false,"draft":null,"has_indexable_attachment":true,"indexable":true,"seo_quality":null}}["work"]; window.loswp.workCoauthors = [7554089]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loginModal = {}; window.loginModal.appleClientId = 'edu.academia.applesignon'; window.userInChina = "false";</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":49303578,"attachmentType":"pdf"}"><img alt="First page of “Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/49303578/mini_magick20190131-1454-gz4nj7.png?1549006565" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/images/single_work_splash/adobe_icon.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="7554089" href="https://independent.academia.edu/ThomasFreitag"><img alt="Profile image of Thomas Freitag" class="ds-work-card--author-avatar" src="//a.academia-assets.com/images/s65_no_pic.png" />Thomas Freitag</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">2003, Fems Microbiology Ecology</p><div class="ds-work-card--work-metadata"><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">visibility</span><p class="ds2-5-body-sm" id="work-metadata-view-count">…</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">description</span><p class="ds2-5-body-sm">11 pages</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">link</span><p class="ds2-5-body-sm">1 file</p></div></div><script>(async () => { const workId = 5409506; 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(2003). Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea. Fems Microbiology Ecology."},{"name":"Chicago","citation":"Freitag, Thomas. “Effect of Anoxia and High Sulphide Concentrations on Heterotrophic Microbial Communities in Reduced Surface Sediments (Black Spots) in Sandy Intertidal Flats of the German Wadden Sea.” Fems Microbiology Ecology, 2003."},{"name":"Vancouver","citation":"Freitag T. Effect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal flats of the German Wadden Sea. Fems Microbiology Ecology. 2003; "},{"name":"Harvard","citation":"Freitag, T. 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It is assumed that the appearance of Black Spots is linked to elevated levels of organic matter content within the sediments. In order to establish the effect of high substrate and sulphide concentrations on the heterotrophic microbial communities in Black Spot sediments, bacterial abundances and the potential C-source utilisation patterns of microbial communities were compared in natural and artificially induced Black Spots and unaffected control sites. Bacterial numbers were estimated by direct counts and the most probable number technique for different physiological groups, while patterns of C-substrate utilisation of entire aerobic microbial communities were assessed using the Biolog1 sole-carbon-sourcecatabolism assay. Bacterial abundances at Black Spot sites were increased, with increases in mean cell numbers, more disperse data distributions and more extreme values. Substrate utilisation patterns of aerobic microbial communities were significantly different in Black Spot sediment slurries, showing diminished richness (number of C-sources catabolised) and substrate diversity (Shannon diversity index) in comparison to unaffected sites. Principal component analysis clearly discriminated Black Spot utilisation patterns from controls and indicated that microbial communities in individual Black Spot sites are functionally diverse and differ from communities in oxidised surface sediments and reduced subsurface sediments at control sites. This work suggests that potentially negative effects on microbial communities in Black Spot sediments, through anoxia and high sulphide concentrations, are balanced by the stimulating influence of substrate availability, leading to comparable or higher bacterial numbers, but lower functional microbial diversity of aerobic microbial communities.</p></div></div><div class="ds-top-related-works--grid-container"><div class="ds-related-content--container ds-top-related-works--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="0" data-entity-id="5409509" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/5409509/E_ect_of_anoxia_and_high_sulphide_concentrations_on_heterotrophic_microbial_communities_in_reduced_surface_sediments_Black_Spots_in_sandy_intertidal_ats_of_the_German_Wadden_Sea">E¡ect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal £ats of the German Wadden Sea</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="7554089" href="https://independent.academia.edu/ThomasFreitag">Thomas Freitag</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2003</p><p class="ds-related-work--abstract ds2-5-body-sm">Black reduced sediment surfaces (Black Spots) in sandy intertidal flats of the German Wadden Sea (southern North Sea) are characterised by elevated sulphide concentrations (up to 20 mM) and low redox potentials. It is assumed that the appearance of Black Spots is linked to elevated levels of organic matter content within the sediments. In order to establish the effect of high substrate and sulphide concentrations on the heterotrophic microbial communities in Black Spot sediments, bacterial abundances and the potential C-source utilisation patterns of microbial communities were compared in natural and artificially induced Black Spots and unaffected control sites. Bacterial numbers were estimated by direct counts and the most probable number technique for different physiological groups, while patterns of C-substrate utilisation of entire aerobic microbial communities were assessed using the Biolog1 sole-carbon-sourcecatabolism assay. Bacterial abundances at Black Spot sites were increased, with increases in mean cell numbers, more disperse data distributions and more extreme values. Substrate utilisation patterns of aerobic microbial communities were significantly different in Black Spot sediment slurries, showing diminished richness (number of C-sources catabolised) and substrate diversity (Shannon diversity index) in comparison to unaffected sites. Principal component analysis clearly discriminated Black Spot utilisation patterns from controls and indicated that microbial communities in individual Black Spot sites are functionally diverse and differ from communities in oxidised surface sediments and reduced subsurface sediments at control sites. This work suggests that potentially negative effects on microbial communities in Black Spot sediments, through anoxia and high sulphide concentrations, are balanced by the stimulating influence of substrate availability, leading to comparable or higher bacterial numbers, but lower functional microbial diversity of aerobic microbial communities.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"E¡ect of anoxia and high sulphide concentrations on heterotrophic microbial communities in reduced surface sediments (Black Spots) in sandy intertidal £ats of the German Wadden Sea","attachmentId":49303554,"attachmentType":"pdf","work_url":"https://www.academia.edu/5409509/E_ect_of_anoxia_and_high_sulphide_concentrations_on_heterotrophic_microbial_communities_in_reduced_surface_sediments_Black_Spots_in_sandy_intertidal_ats_of_the_German_Wadden_Sea","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/5409509/E_ect_of_anoxia_and_high_sulphide_concentrations_on_heterotrophic_microbial_communities_in_reduced_surface_sediments_Black_Spots_in_sandy_intertidal_ats_of_the_German_Wadden_Sea"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="26116700" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/26116700/Effect_of_macrofaunal_bioturbation_on_bacterial_distribution_in_marine_sandy_sediments_with_special_reference_to_sulphur_oxidising_bacteria">Effect of macrofaunal bioturbation on bacterial distribution in marine sandy sediments, with special reference to sulphur-oxidising bacteria</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="50025378" href="https://shef.academia.edu/RutgerDeWit">Rutger De Wit</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Journal of Sea Research, 1999</p><p class="ds-related-work--abstract ds2-5-body-sm">We have studied the impact of the bioturbating macrofauna, in particular the lugworm Arenicola marina and the bivalve Cerastoderma edule, on abundances and distribution patterns of total bacteria and of bacteria of selected functional groups in sandy intertidal sediments. The selected groups comprised the colourless sulphur-oxidising bacteria and the anoxygenic phototrophic bacteria, which are expected to occupy small zones at the oxygen-sulphide interface in stable (non-bioturbated) sediments. The presence of a wooden wreck buried in the sediment at 10 cm depth within a large area of intertidal sand flat colonised by lugworms provided a unique opportunity to confront field observations with laboratory simulations. The site with the wooden wreck, which was used as control site, was devoid of both A. marina and C. edule, while the composition of the rest of the zoobenthic community was rather similar to that of the surrounding area. In the field, the density of total bacteria was approximately one order of magnitude higher in the control site than in the natural (bioturbated) site. This can be explained by the higher contents of silt and clay particles (higher surface-area=volume ratio) and higher total organic-carbon contents found at the control site. It appears that the presence of macrofauna affects sedimentation processes, which indirectly influence bacterial dynamics. Samples from the control site have been incubated in the laboratory with A. marina and C. edule added (bioturbated core), while an unamended core served as a control. The laboratory experiments contrasted with the field observations, because it was found that total bacteria were actually higher in the deeper layers of the bioturbated core. Moreover, the populations were more homogeneous (less stratified) and colourless sulphur bacteria were on average less numerous in the bioturbated core. In general, laboratory incubations resulted in a decrease of total bacteria with a concomitant increase of colourless and phototrophic sulphur-oxidising bacteria and thus in modifications of the bacterial community structure. Hence, our results demonstrate that care must be taken in extrapolating results from laboratory experiments (e.g. mesocosm research) to field situations.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Effect of macrofaunal bioturbation on bacterial distribution in marine sandy sediments, with special reference to sulphur-oxidising bacteria","attachmentId":46460776,"attachmentType":"pdf","work_url":"https://www.academia.edu/26116700/Effect_of_macrofaunal_bioturbation_on_bacterial_distribution_in_marine_sandy_sediments_with_special_reference_to_sulphur_oxidising_bacteria","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/26116700/Effect_of_macrofaunal_bioturbation_on_bacterial_distribution_in_marine_sandy_sediments_with_special_reference_to_sulphur_oxidising_bacteria"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="10271482" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/10271482/Complex_Microbial_Communities_Inhabiting_Sulfide_rich_Black_Mud_from_Marine_Coastal_Environments">Complex Microbial Communities Inhabiting Sulfide-rich Black Mud from Marine Coastal Environments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="25153219" href="https://slu.academia.edu/MaryYang">Mary Yang</a></div><p class="ds-related-work--abstract ds2-5-body-sm">We have used 16S rRNA phylogenetic analysis to investigate the microbial diversity of sulfur-rich black mud marine sediments. Two distinct environments were examined: mud from a hypersaline marsh and mud from a brackish marsh. Only two out of one hundred cloned 16S rDNA sequences were identical, indicating a very complex community of microbial species. Both environments exhibited significant sulfate-reducing δ-Proteobacteria, indicating that these organisms are likely the primary source of reduced forms of sulfate required by other species. Since seawater has abundant quantities of sulfate, microorganisms that reduce this molecule are important for the cycling of sulfur in the global ecosystem. PCR of the 16S rDNAs extracted directly from the mud without culturing revealed that most of the population was less than 95% identical to known 16S rDNAs, and eight of the one hundred sequences analyzed were only 80-85% identical to known sequences. Four sequences from this more divergent group were identified as new candidate divisions. Although sulfate-reducing bacteria dominated both ecosystems, the hypersaline black mud also harbored organisms related to known halophiles. A search for Archaea uncovered a diverse collection of halophilic species that showed taxonomic affiliation with the Halobacteriales. From our sampling of 100 rDNA clones, we estimate that the diversity of organisms in these black mud samples is approximately 10,000 species -greater than the approximately 6000 Archaea and Bacteria currently recognized by culture studies. Additionally, we note a lack of predominant species in our sample. This suggests a modestly ambitious DNA sequencing effort of rDNAs from black mud would yield thousands of new species and many new candidate divisions.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Complex Microbial Communities Inhabiting Sulfide-rich Black Mud from Marine Coastal Environments","attachmentId":47460876,"attachmentType":"pdf","work_url":"https://www.academia.edu/10271482/Complex_Microbial_Communities_Inhabiting_Sulfide_rich_Black_Mud_from_Marine_Coastal_Environments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/10271482/Complex_Microbial_Communities_Inhabiting_Sulfide_rich_Black_Mud_from_Marine_Coastal_Environments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="5582223" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/5582223/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments_Biogeochemical_controls_on_microbial_diversity">Biogeochemical controls on microbial diversity in seafloor sulphidic sediments: Biogeochemical controls on microbial diversity</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="191744" href="https://chicago.academia.edu/KimHandley">Kim M Handley</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32474739" href="https://independent.academia.edu/JonathanLloyd1">Jonathan Lloyd</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geobiology, 2010</p><p class="ds-related-work--abstract ds2-5-body-sm">The ultimate fate of hydrothermal sulphides on the seafloor depends on the nature and rate of abiotic and microbially catalysed reactions where sulphide minerals are exposed to oxic seawater. This study combines organic and inorganic geochemical with microbiological measurements across a suboxic transition zone of highly altered sulphidic sediments from the Trans-Atlantic Geotransverse hydrothermal field to characterize the reaction products and microbial communities present. There is distinct biogeochemical zonation apparent within the sediment sequence from oxic surface layers through a suboxic transition zone into the sulphide material. The microbial communities in the sediment differ significantly between the biogeochemical horizons sampled, with the identified microbes inferred to be associated with Fe and S redox cycling. In particular, Marinobacter species, organisms associated with circumneutral Fe oxidation, are dominant in a sulphide lens present in the lower core. The dominance of Marinobacter-related sequences within the relict sulphide lens implies that these organisms play an important role in the alteration of sulphides at the seafloor once active venting has ceased.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Biogeochemical controls on microbial diversity in seafloor sulphidic sediments: Biogeochemical controls on microbial diversity","attachmentId":49230297,"attachmentType":"pdf","work_url":"https://www.academia.edu/5582223/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments_Biogeochemical_controls_on_microbial_diversity","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/5582223/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments_Biogeochemical_controls_on_microbial_diversity"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="21003630" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/21003630/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments">Biogeochemical controls on microbial diversity in seafloor sulphidic sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="42241664" href="https://cmu.academia.edu/AmilcarUmana">Amilcar Umana</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geobiology, 2010</p><p class="ds-related-work--abstract ds2-5-body-sm">The ultimate fate of hydrothermal sulphides on the seafloor depends on the nature and rate of abiotic and microbially catalysed reactions where sulphide minerals are exposed to oxic seawater. This study combines organic and inorganic geochemical with microbiological measurements across a suboxic transition zone of highly altered sulphidic sediments from the Trans-Atlantic Geotransverse hydrothermal field to characterize the reaction products and microbial communities present. There is distinct biogeochemical zonation apparent within the sediment sequence from oxic surface layers through a suboxic transition zone into the sulphide material. The microbial communities in the sediment differ significantly between the biogeochemical horizons sampled, with the identified microbes inferred to be associated with Fe and S redox cycling. In particular, Marinobacter species, organisms associated with circumneutral Fe oxidation, are dominant in a sulphide lens present in the lower core. The dominance of Marinobacter-related sequences within the relict sulphide lens implies that these organisms play an important role in the alteration of sulphides at the seafloor once active venting has ceased.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Biogeochemical controls on microbial diversity in seafloor sulphidic sediments","attachmentId":41666513,"attachmentType":"pdf","work_url":"https://www.academia.edu/21003630/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/21003630/Biogeochemical_controls_on_microbial_diversity_in_seafloor_sulphidic_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="12605971" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/12605971/Periodic_sulfide_irruptions_impact_microbial_community_structure_and_diversity_in_the_water_column_of_a_hypersaline_lake">Periodic sulfide irruptions impact microbial community structure and diversity in the water column of a hypersaline lake</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="31550655" href="https://independent.academia.edu/SwanBrandon">Brandon Swan</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Aquatic Microbial Ecology, 2010</p><p class="ds-related-work--abstract ds2-5-body-sm">The occurrence of hypoxia/anoxia and sulfide formation in productive lakes, enclosed seas, and the coastal ocean often results in catastrophic loss of plankton, benthic invertebrates, and fish populations. Sulfide formed in deeper waters is mixed upward due to storm events or currents, thereby removing oxygen from large portions of the water column. Although the deleterious effects of these events on many organisms are known, the effects on microbial communities have received less attention. Archaeal and bacterial community structure and diversity were investigated at 6 stations along 2 intersecting transects passing through a sulfide-rich plume formed in the moderately hypersaline Salton Sea, California, USA. Community structure analysis clearly distinguished samples within and outside the sulfide plume, and multivariate analyses found these patterns to be correlated with sulfide concentration. Cloning and sequencing of 16S rRNA genes revealed that Actinobacteria, Gammaproteobacteria (purple sulfur bacteria), and Chlorobi (green sulfur bacteria) were more prevalent at stations with higher sulfide concentration, and Synechococcus spp. was the most abundant bacterial lineage at most stations. Archaeal diversity was low, and sequences were affiliated with Methanohalophilus spp., Methanococcoides spp., Methanosarcinales spp., many of which are related to known methylotrophs, and Marine Benthic Group (MBG)-D sequences. Compositional differences detected between stations may reflect differential tolerances or utilization of sulfide and other reduced-sulfur compounds by the planktonic microbial community.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Periodic sulfide irruptions impact microbial community structure and diversity in the water column of a hypersaline lake","attachmentId":46055081,"attachmentType":"pdf","work_url":"https://www.academia.edu/12605971/Periodic_sulfide_irruptions_impact_microbial_community_structure_and_diversity_in_the_water_column_of_a_hypersaline_lake","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/12605971/Periodic_sulfide_irruptions_impact_microbial_community_structure_and_diversity_in_the_water_column_of_a_hypersaline_lake"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="51967808" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/51967808/Metabolically_active_obligate_aerobes_in_anoxic_sulfidic_marine_sediments">Metabolically-active obligate aerobes in anoxic (sulfidic) marine sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="65366308" href="https://independent.academia.edu/AnindaMazumdar1">Aninda Mazumdar</a></div><p class="ds-related-work--abstract ds2-5-body-sm">Metabolically-active obligate aerobes are unheard-of in tightly-anoxic environments. Present culture-independent and culture-dependent investigations revealed aerobic microbial communities along two, ~3-meter-long sediment-cores underlying the eastern Arabian Sea oxygen minimum zone, where high H2S disallows O2 influx from the water-column. While genes for aerobic respiration by aa3-/cbb3-type cytochrome-c oxidases and cytochrome-bd ubiquinol oxidase, and aerobic oxidation of methane/ammonia/alcohols/thiosulfate/sulfite/organosulfur-compounds, were present across the cores, so were live aerobic, sulfur-chemolithoautotrophs and chemoorganoheterotrophs. The 8820-years-old, highly–sulfidic, methane-containing sediment-sample from 275 cmbsf of 530 mbsl yielded many such obligately-aerobic bacterial-isolates that died upon anaerobic incubation with alternative electron-acceptors/fermentative-substrates. Several metatranscriptomic reads from this sediment-sample matched aerobic-respiratio...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Metabolically-active obligate aerobes in anoxic (sulfidic) marine sediments","attachmentId":69450927,"attachmentType":"pdf","work_url":"https://www.academia.edu/51967808/Metabolically_active_obligate_aerobes_in_anoxic_sulfidic_marine_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/51967808/Metabolically_active_obligate_aerobes_in_anoxic_sulfidic_marine_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="80766168" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/80766168/Increasing_oxygen_deficiency_changes_rare_and_moderately_abundant_bacterial_communities_in_coastal_soft_sediments">Increasing oxygen deficiency changes rare and moderately abundant bacterial communities in coastal soft sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32452671" href="https://helsinki.academia.edu/JoannaNorkko">Joanna Norkko</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Scientific Reports, 2019</p><p class="ds-related-work--abstract ds2-5-body-sm">Coastal hypoxia is a major environmental problem worldwide. Hypoxia-induced changes in sediment bacterial communities harm marine ecosystems and alter biogeochemical cycles. Nevertheless, the resistance of sediment bacterial communities to hypoxic stress is unknown. We investigated changes in bacterial communities during hypoxic-anoxic disturbance by artificially inducing oxygen deficiency to the seafloor for 0, 3, 7, and 48 days, with subsequent molecular biological analyses. We further investigated relationships between bacterial communities, benthic macrofauna and nutrient effluxes across the sediment-water-interface during hypoxic-anoxic stress, considering differentially abundant operational taxonomic units (OTUs). The composition of the moderately abundant OTUs changed significantly after seven days of oxygen deficiency, while the abundant and rare OTUs first changed after 48 days. High bacterial diversity maintained the resistance of the communities during oxygen deficiency u...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Increasing oxygen deficiency changes rare and moderately abundant bacterial communities in coastal soft sediments","attachmentId":87038763,"attachmentType":"pdf","work_url":"https://www.academia.edu/80766168/Increasing_oxygen_deficiency_changes_rare_and_moderately_abundant_bacterial_communities_in_coastal_soft_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/80766168/Increasing_oxygen_deficiency_changes_rare_and_moderately_abundant_bacterial_communities_in_coastal_soft_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="21145421" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/21145421/The_distribution_and_activity_of_sulphate_reducing_bacteria_in_estuarine_and_coastal_marine_sediments">The distribution and activity of sulphate reducing bacteria in estuarine and coastal marine sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="42331215" href="https://independent.academia.edu/DNedwell">D. Nedwell</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Antonie van Leeuwenhoek, 2002</p><p class="ds-related-work--abstract ds2-5-body-sm">Sulphate-reducing bacteria (SRB) play a vital role both the carbon and sulphur cycles and thus are extremely important components of the global microbial community. However, it is clear that the ecology, the distribution and activity of different SRB groups is poorly understood. Probing of rRNA suggests that different sediments have distinctly different patterns of SRB with complex factors controlling the activity of these organisms. The linking of community structure and function using sediment slurry microcosms suggests that certain groups of SRB, e.g., Desulfobacter and Desulfobulbus, can be linked to the use of specific substrates in situ. However, it is still unclear what environmental substrates are utilised by the majority of known SRBs. The work to date has greatly enhanced our understanding of the ecology of these organisms and is beginning to suggest patterns in their distribution and activity that may be relevant to understanding microbial ecology in general.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"The distribution and activity of sulphate reducing bacteria in estuarine and coastal marine sediments","attachmentId":41735320,"attachmentType":"pdf","work_url":"https://www.academia.edu/21145421/The_distribution_and_activity_of_sulphate_reducing_bacteria_in_estuarine_and_coastal_marine_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/21145421/The_distribution_and_activity_of_sulphate_reducing_bacteria_in_estuarine_and_coastal_marine_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="23929170" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/23929170/Microenvironments_and_microbial_community_structure_in_sediments">Microenvironments and microbial community structure in sediments</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="46109978" href="https://independent.academia.edu/FrancoisLLMuller">Francois L. L. Muller</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Environmental Microbiology, 2002</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Microenvironments and microbial community structure in sediments","attachmentId":44315957,"attachmentType":"pdf","work_url":"https://www.academia.edu/23929170/Microenvironments_and_microbial_community_structure_in_sediments","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/23929170/Microenvironments_and_microbial_community_structure_in_sediments"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":49303578,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":49303578,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_49303578" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. 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