Ecosystem Modeling in the Pacific

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In turn, we have to balance our uses of the ocean, including fisheries, to make sure that these resources are around for future generations. Ecosystem-based management considers all impacts on and uses of the ecosystem. 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about="/pacific-islands/ecosystems/ecosystem-modeling-pacific" class="article article--generic-page"> <div class="col-md-12"> <div class="row"> <div class="col-md-12"> <div class="content-header hr"> <nav class="content-header__breadcrumb"><a href="/topic/ecosystems" class="link link--breadcrumb">Ecosystems</a></nav> <h1 class="content-header__title"> <span>Ecosystem Modeling in the Pacific</span> </h1> <p class="content-header__content text--large">Models can be used to explore changing ecosystem dynamics, impacts from climate change, and scenarios for resource management.</p> <div class="content-header__footer"> <span class="content-header__region"> <div class="regions "> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </span> </div> </div> </div> <div class="col-md-8"> <div class="article__hero"> <img class="dam-image img-responsive" src="/s3//styles/full_width/s3/dam-migration/20180707_ofu_ewb_2.jpg?itok=oExF88V-" width="750" height="500" alt="Split underwater/overwater shot with reef below and green mountains with a sandy beach and palms trees above. " loading="lazy" typeof="foaf:Image" /> </div> <div class="article__content modal__target wyswyg-edit"> <p dir="ltr">We depend on the ocean for food, medicine, income, recreation, and much more. In turn, we have to balance our uses of the ocean, including fisheries, to make sure that these resources are around for future generations. Ecosystem-based management considers all impacts on and uses of the ecosystem. Managers are challenged with protecting both natural resources and human services in changing environmental conditions, such as climate and pollution, that may alter the ecosystem state, and changing regulations that impact human uses. Computer models simulate these complex interactions and can provide insights to balance ecological and economic tradeoffs for different management plans.</p> <h2 dir="ltr">Atlantis: A Decision Support Tool for Ecosystem-based Management</h2> <p>One model is the Atlantis Ecosystem Model, which can produce realistic simulations of ecosystem dynamics. The model simulations can be used to explore ecological hypotheses, simulate different climate scenarios, and test human effects on the environment including fishing, tourism, natural resource extraction, land use, and nonpoint-source pollution. The original Atlantis code was developed by scientists at the <a href="http://www.cmar.csiro.au/research/mse/">Commonwealth Scientific and Industrial Research Organisation</a> in Australia and has been implemented for more than 30 ecosystems worldwide.</p> <p dir="ltr">Atlantis is an effective tool for evaluating management strategies, particularly for testing management policies and methods for coral reef conservation. We can assess management scenarios with simulations that represent ecosystems and their complexities. The model is not intended to replace traditional stock assessments or to make short-term decisions (e.g., total catch limits). Instead, it complements traditional assessments with an ecosystem approach. The Atlantis framework incorporates information on the biological, geochemical, and physical processes of a specific region or system. Atlantis integrates these dynamics, includes the effects of different user groups, and dynamically tracks the interaction of these factors over time. It also simulates the important processes of assessment, management, and compliance.</p> <div> <div class="inline-img left"><img alt="Guam_spatial-model.jpg" class="dam-image" data-src="https://media.fisheries.noaa.gov/dam-migration-miss/md_gKIbN3NpCPH2.jpg?1539229966"></div> <div class="webdam-embed-caption"> <h2>Ecosystem Modeling in Guam</h2> </div> <p>We adapted the Atlantis framework to study shallow coral reef ecosystems in Guam. Stakeholders identified the main stressors to Guam's reefs, various management strategies, as well as economic and ecological indicators to include in the model for Guam.</p> </div> <p dir="ltr">With the Guam Atlantis model, we can ask questions such as, "What happens with...</p> <p dir="ltr">...increased or decreased coral cover?</p> <p dir="ltr">...changing populations of parrotfishes, sharks, sea stars, or turtles?</p> <p dir="ltr">...increasing or decreasing nutrient input?</p> <p dir="ltr">...an growing human population?"</p> <p dir="ltr">We can also ask questions about the local economy. Because Atlantis has a spatially explicit modeling approach, we can explore these types of questions island-wide and by specific areas.</p> <h2 dir="ltr">Ecosystem Modeling in the Main Hawaiian Islands</h2> <p dir="ltr">Currently, we are applying the Atlantis software to the insular marine ecosystems of the main Hawaiian Islands. For example, we can use the model to evaluate ecosystem effects (social, economic, and ecologic) of the commercially-important bottomfish fishery and of changes in the Hawaiian monk seal population. Additionally, we can evaluate climate impacts and how ocean acidification will alter ecosystem dynamics. Ocean acidification degrades coral reefs, negatively affecting reef fishes that use that ecosystem as their habitat, which in turn will affect the recreational and cultural fishing practices, but also indirectly affects human communities. Since the model includes bi-directional dynamics, we can identify the direct and indirect effects of climate change on human well-being, and on the ecosystem structure and resilience, and evaluate socio-ecological tradeoffs of different management strategies.</p> <div><img alt="Components of the Atlantis Ecosystem Model for Hawaii" height="473" width="750" loading="lazy" class="dam-image" data-src="https://media.fisheries.noaa.gov/dam-migration-miss/1280_cziU6DYMMiX2.jpg?1540331536"><div class="webdam-embed-caption"> </div> <h2>Conceptual Ecosystem Modeling in West Hawaii</h2> <p dir="ltr">Human communities are a key component of ecosystems. To better understand coastal ecosystems on the local level and contribute to ecosystem-based management overall, we work with models that include social and cultural factors alongside ecological and biological information. In West Hawaii, an especially complex and dynamic marine ecosystem, we asked stakeholders to provide input on ecosystem threats and services and then diagrammed the connections in a conceptual ecosystem model.</p> <p dir="ltr">This model presents a way to apply ecosystem-based management that is both locally-specific and transferable to other locations. Local resource management can better assess the ecosystem pressures that stakeholders specifically identify as influential and important. Critical information can emerge through this process. For example, cultural ecosystem services, which are critical to society yet not often incorporated in management strategies, were perceived by participants as the most vulnerable to ecosystem change in West Hawaii. Increasing our understanding of these intangible benefits to communities will be a critical step toward integrating them into resource management.</p> <div><img alt="Figure showing the complex connections and links between ecosystem pressures and services" height="599" width="750" loading="lazy" class="dam-image" data-src="https://media.fisheries.noaa.gov/dam-migration-miss/1280_QS9ibo9IX3N9.png?1528499153"><div class="webdam-embed-caption"> </div> <h2>Size-based food web modeling with therMizer </h2> <div> <div> <div class="inline-img left"><img alt="MathInOceanograph_figure.png" class="dam-image" data-src="https://media.fisheries.noaa.gov/dam-migration-miss/md_kWSK1WD91v94.png?1540333412"></div> <div class="webdam-embed-caption"> <p>Another approach to ecosystem modeling is based on fish size. In the open ocean, there are far more small fish than large fish and fish tend to eat prey that is smaller than themselves. Furthermore, we know that different fish species have different body sizes. Therefore, we can construct models based on these size-based relationships. One such model is therMizer. therMizer incorporates fish size and the impacts of ocean temperature on metabolism and other body processes. We can use this model to understand how both climate change and fishing might impact the open ocean in the future.</p> </div> </div> </div> <div> <div class="webdam-embed-caption"> <h2>Ecopath with Ecosim</h2> </div> </div> <p dir="ltr">Ecopath with Ecosim (EwE) models how energy moves through the food web from phytoplankton to apex predators. Species-specific diets are the backbone of this model, so it's important to know which species are predators, and which species they prey on, in order to make the model as accurate as possible. We can use EwE to understand how a change in one species will affect all the other species in the ecosystem. We can can also use EwE to examine how fisheries and ecosystems interact.</p> <div><img alt="Figure showing how energy moves through the food web from phytoplankton to apex predators" height="400" width="750" loading="lazy" class="dam-image" data-src="https://media.fisheries.noaa.gov/dam-migration-miss/1280_2B1JspQvDqC1.png?1539229759"><div class="webdam-embed-caption"> <p class="caption--image">Most of the biomass in the food web is at its base: phytoplankton and detritus. Their energy is transferred up through the food web as they are eaten by zooplankton and then zooplankton are eaten by small fish. Only a small amount of energy makes its way to the top of the food web to species like sharks, tunas, and people.</p> </div> </div> </div> </div> </div> <div class="article__publications"> <h3 class="article__publications-title">Publications</h3> <div class="horizontal-list__container"> <div class="horizontal-list--3-column"> <div class="horizontal-list__item"> <div about="/resource/peer-reviewed-research/evaluating-management-strategies-optimize-coral-reef-ecosystem"> <div class="resource-card"> <div class="resource-card__eyebrow">peer_reviewed</div> <h3 class="resource-card__title"> <a class="resource-card__title-link" href="/resource/peer-reviewed-research/evaluating-management-strategies-optimize-coral-reef-ecosystem"> <span>Evaluating Management Strategies to Optimize Coral Reef Ecosystem Services</span> </a> </h3> <p class="resource-card__content text--small"> Red slate pencil urchin (Heterocentrotus mamillatus) on the reef at Hawaii Island, Hawaii. Photo: NOAA Fisheries.Earlier declines in marine…</p> <div class="resource-card__region"> <div class="regions resource-card__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> </div> </div> </div> <div class="horizontal-list__item"> <div about="/resource/peer-reviewed-research/revealing-complex-social-ecological-interactions-through"> <div class="resource-card"> <div class="resource-card__eyebrow">peer_reviewed</div> <h3 class="resource-card__title"> <a class="resource-card__title-link" href="/resource/peer-reviewed-research/revealing-complex-social-ecological-interactions-through"> <span>Revealing Complex Social-Ecological Interactions Through Participatory Modeling to Support Ecosystem-Based Management in Hawaiʻi</span> </a> </h3> <p class="resource-card__content text--small"> The Hawaiian Islands are home to a complex and dynamic marine ecosystem that serves as a backbone to the state's economy and society's well-being…</p> <div class="resource-card__region"> <div class="regions resource-card__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> </div> </div> </div> <div class="horizontal-list__item"> <div about="/resource/peer-reviewed-research/ocean-futures-under-ocean-acidification-marine-protection-and"> <div class="resource-card"> <div class="resource-card__eyebrow">peer_reviewed</div> <h3 class="resource-card__title"> <a class="resource-card__title-link" href="/resource/peer-reviewed-research/ocean-futures-under-ocean-acidification-marine-protection-and"> <span>Ocean Futures Under Ocean Acidification, Marine Protection, and Changing Fishing Pressures Explored Using a Worldwide Suite of Ecosystem Models</span> </a> </h3> <p class="resource-card__content text--small"> Sea turtle swims above coral reef at Baker Island (Photo: NOAA Fisheries/Paula Ayotte). Ecosystem-based management of the ocean considers…</p> <div class="resource-card__region"> <div class="regions resource-card__meta-link-group"> <div class="regions__vocab"> <span class="national"> <a class="link link--region link--region-national" href="/about-us">National</a> </span> </div> </div> </div> </div> </div> </div> </div> <div class="horizontal-list__footer"> </div> </div> </div> </div> <div class="col-md-4 article__sidebar"> <div class="info-links"> <h2 class="info-links__title">More Information </h2> <ul class="list--arrow info-links__links"> <li class="info-links__links-item"> <a class="link" href="/feature-story/exploring-ecosystem-dynamics-explain-trends-hawaiian-monk-seal-populations">Exploring Ecosystem Dynamics to Explain Trends in Hawaiian Monk Seal Populations</a> </li> <li class="info-links__links-item"> <a class="link" href="/feature-story/working-together-understand-social-and-ecological-connections-west-hawaii">Working Together to Understand Social and Ecological Connections in West Hawai‘i</a> </li> </ul> </div> <div class="views-element-container"> <div class="vertical-list"> <h2 class="vertical-list__header vertical-list__header--small">Recent News</h2> <div class="vertical-list__item"> <div about="/feature-story/hawaii-coral-reef-assessments-complete-2024"> <div class="teaser teaser--small"> <div class="teaser__content teaser__content--small"> <div class="teaser__meta teaser__meta--small"> <span class="teaser__meta-link">Feature Story</span> </div> <h4 class="teaser__title teaser__title--small"><a class="teaser__title-link" href="/feature-story/hawaii-coral-reef-assessments-complete-2024"> <span>Hawai‘i Coral Reef Assessments Complete for 2024 </span> </a></h4> <div class="teaser__meta teaser__meta--hide">  <span class="teaser__meta-link">Feature Story</span> <span class="teaser__meta-spacer">,</span> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> <div class="teaser__meta teaser__meta--small"> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> </div> <a class="teaser__image-link teaser__image-link--small" href="/feature-story/hawaii-coral-reef-assessments-complete-2024"> <div class="aspect-ratio--three-by-two"> <div class="aspect-ratio__content"> <img class="dam-image img-responsive" src="/s3//styles/media_375_x_250/s3/2024-11/512x341-NCRMP-2024_0.png?itok=XH2fnqWc" width="375" height="250" alt="Healthy coral reef with fishes in the foreground, a diver conducts a survey in the background. " loading="lazy" typeof="foaf:Image" /> <span class="dam_caption">A scientist carefully hovers above the reef off of Kailua-Kona to take photographs while swimming along a transect line. He took more than 1,000 photos of this single transect that will be stitched together to form a 3D model of this reef. It will be interesting to see how this reef with high coral cover has changed over time! Credit: NOAA Fisheries/Dani Escontrella</span> </div> </div> </a> </div> </div> </div> <div class="vertical-list__item"> <div about="/feature-story/ai-meets-aquaculture-study-hawaiian-monk-seal-interactions-net-pens"> <div class="teaser teaser--small"> <div class="teaser__content teaser__content--small"> <div class="teaser__meta teaser__meta--small"> <span class="teaser__meta-link">Feature Story</span> </div> <h4 class="teaser__title teaser__title--small"><a class="teaser__title-link" href="/feature-story/ai-meets-aquaculture-study-hawaiian-monk-seal-interactions-net-pens"> <span>AI Meets Aquaculture to Study Hawaiian Monk Seal Interactions With Net Pens</span> </a></h4> <div class="teaser__meta teaser__meta--hide">  <span class="teaser__meta-link">Feature Story</span> <span class="teaser__meta-spacer">,</span> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> <div class="teaser__meta teaser__meta--small"> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> </div> <a class="teaser__image-link teaser__image-link--small" href="/feature-story/ai-meets-aquaculture-study-hawaiian-monk-seal-interactions-net-pens"> <div class="aspect-ratio--three-by-two"> <div class="aspect-ratio__content"> <img class="dam-image img-responsive" src="/s3//styles/media_375_x_250/s3/2024-11/seals-swim-near-net-pens-BOM.jpg?itok=J6rHfXMC" width="375" height="250" alt="Two Hawaiian monk seals swim near an aquaculture net pen full of fish." loading="lazy" typeof="foaf:Image" /> <span class="dam_caption">NOAA Fisheries, in collaboration with Blue Ocean Mariculture, is conducting a multi-year pilot study to evaluate observational methods and tools for studying Hawaiian monk seal behavior. Courtesy of Blue Ocean Mariculture</span> </div> </div> </a> </div> </div> </div> <div class="vertical-list__item"> <div about="/feature-story/deck-observer-0001-looking-back-30-years"> <div class="teaser teaser--small"> <div class="teaser__content teaser__content--small"> <div class="teaser__meta teaser__meta--small"> <span class="teaser__meta-link">Feature Story</span> </div> <h4 class="teaser__title teaser__title--small"><a class="teaser__title-link" href="/feature-story/deck-observer-0001-looking-back-30-years"> <span>On Deck With Observer 0001— Looking Back 30 Years</span> </a></h4> <div class="teaser__meta teaser__meta--hide">  <span class="teaser__meta-link">Feature Story</span> <span class="teaser__meta-spacer">,</span> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> <div class="teaser__meta teaser__meta--small"> <div class="regions teaser__meta-link-group"> <div class="regions__vocab"> <span class="pacific-islands"> <a class="link link--region link--region-pacific-islands" href="/region/pacific-islands">Pacific Islands</a> </span> </div> </div> </div> </div> <a class="teaser__image-link teaser__image-link--small" href="/feature-story/deck-observer-0001-looking-back-30-years"> <div class="aspect-ratio--three-by-two"> <div class="aspect-ratio__content"> <img class="dam-image img-responsive" src="/s3//styles/media_375_x_250/s3/2024-11/Tonya_atsea1998.jpeg?itok=VFd8bBTE" width="375" height="250" alt="A woman poses holding a fish while aboard a fishing vessel with fisherman and their catch separated into baskets in the background. " loading="lazy" typeof="foaf:Image" /> <span class="dam_caption">Tonya Wick aboard a fishing vessel at sea in 1998. Photo courtesy of Tonya Wick</span> </div> </div> </a> </div> </div> </div> <div class="vertical-list__footer vertical-list__footer--small"> <a href="/news-and-announcements/news" class="link link--cta vertical-list__footer-link">More News</a> </div> </div> </div> </div> <div class="col-md-12"> <div class="article__updated"> <div class="last-updated"> <div class="last-updated__message"> <p class="text--small caption last-updated">Last updated by <a class="office-vocab__item" href="/about/pacific-islands-fisheries-science-center">Pacific Islands Fisheries Science Center</a> on November 12, 2024</p> </div> </div> <a class="button button--secondary button--tag" href="/tags/pacific-islands">Pacific Islands </a> <a class="button button--secondary button--tag" href="/tags/ecosystem-modeling">Ecosystem Modeling</a> <a class="button button--secondary button--tag" href="/tags/ecosystem-based-fisheries-management">Ecosystem-Based Fisheries Management</a> <a class="button button--secondary 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Ecosystem Modeling in the Pacific | NOAA Fisheries