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Sensitivity of krill to warming, acidification, and deoxygenation research

Krill sitting on a fingertip with a dark background.
Krill on fingertip. Credit: NOAA Sanctuaries
  • Principal Investigator(s): Eric Bjorkstedt, NOAA Southwest Fisheries Science Center
  • Fiscal Year Funded: 2024, 2025, 2026

Project: Replicated assessments of sensitivity of krill (Euphausia pacifica) to warming, acidification, and deoxygenation drivers

Why we care

Krill (Euphausia pacifica) are a core forage fish are a essential part of food webs in the California Current Ecosystem. In the California Current Ecosystem (CCE), krill play a critical role in transferring production to higher trophic levels. They serve as ecosystem indicators that contribute to coastwide fisheries management since levels many harvested and protected species prey directly on krill at some point in their life history or depend on prey that do. The goal of this project is to understand how changes in the environment affect krill populations.

What we will do

This project assesses the environmental drivers of krill sensitivity to ocean warming, ocean acidification and deoxygenation. Researchers will conduct an extensive series of replicated experiments to assess the sensitivity of growth, survival, and energetics of juvenile and adult krill to projected ocean conditions.

Researchers will create models that link experimental and data from the field to key ecosystem indicators and assessments. Experiments supporting this work will determine how juvenile and adult krill’s survival and energy use are affected by current and future ocean acidification conditions. The team will also use individual-based and demographic models to analyze population-level effects like changes in size and productivity and the timing of the key life event of molting. Using this combined knowledge, the team will analyze what drives variability in long-term field observations of krill and their environment, making those observations more valuable as ecosystem indicators.

Benefits of our work

Insights from this work will be integrated into models characterizing broader implications of krill sensitivity to ocean acidification, ocean warming, and deoxygenation. This work also establishes a foundation for enhancing opportunities to connect laboratory results and field observations and advance assessment techniques. These models will support diverse needs, including looking back at past changes, providing current snapshots, making short-term forecasts, and projecting long-term changes under future ocean change scenarios.

Investigators
Eric Bjorkstedt, NOAA Southwest Fisheries Science Center (SWFSC)
Shallin Busch, NOAA Northwest Fisheries Science Center (NWFSC)
Paul McElhany, NOAA Northwest Fisheries Science Center (NWFSC)
Jeffrey Abell, Cal Polytechnic Humboldt
Christine J. Cass, Cal Polytechnic Humboldt
Paul Bourdeau, Cal Polytechnic Humboldt
Rick Zechman, Cal Polytechnic Humboldt

Effects of ocean acidification and temperature on Alaskan crabs

Red King Crab
Image credit: David Csepp, NMFS AKFSC ABL

Long-term declines of red king crab in Bristol Bay, Alaska may be partially attributed to ocean acidification conditions. These impacts may be partially responsible for the fishery closures during the 2021–2022 and 2022–2023 seasons. Researchers found that ocean acidification negatively impacts Alaskan crabs generally by changing physiological processes, decreasing growth, increasing death rates and reducing shell thickness. Funded by the Ocean Acidification Program, scientists at the Alaska Fisheries Science Center continue to investigate the responses of early life history stages and study the potential of various Alaska crabs to acclimate to changing conditions. Results will inform models that will use the parameters studied to predict the effects of future ocean acidification on the populations of red king crab in Bristol Bay as well as on the fisheries that depend on them. Fishery managers will better be able to anticipate and manage stocks if changing ocean chemistry affects stock productivity and thus the maximum sustainable yield.

More about this work

Forecasts for Alaska Fisheries

Crab pots and fishing nets in Alaska's Dutch Harbor
Image credit: Michael Theberge

Understanding seasonal changes in ocean acidification in Alaskan waters and the potential impacts to the multi-billion-dollar fishery sector is a main priority. Through work funded by NOAA’s Ocean Acidification Program, the Pacific Marine Environmental Laboratory developed a model capable of depicting past ocean chemistry conditions for the Bering Sea and is now testing the ability of this model to forecast future conditions. This model is being used to develop an ocean acidification indicator provided to fisheries managers in the annual NOAA Eastern Bering Sea Ecosystem Status Report.

ADAPTING TO OCEAN ACIDIFICATION

The NOAA Ocean Acidification Program (OAP) works to prepare society to adapt to the consequences of ocean acidification and conserve marine ecosystems as acidification occurs. Learn more about the human connections and adaptation strategies from these efforts.

Adaptation approaches fostered by the OAP include:

FORECASTING

Using models and research to understand the sensitivity of organisms and ecosystems to ocean acidification to make predictions about the future, allowing communities and industries to prepare

Closeup of oysters cupped in someone's hands

MANAGEMENT

Using these models and predictions as tools to facilitate management strategies that will protect marine resources and communities from future changes

TECHNOLOGY DEVELOPMENT

Developing innovative tools to help monitor ocean acidification and mitigate changing ocean chemistry locally

REDUCING OUR CARBON FOOTPRINT

50 more ways to reduce your carbon footprint >

On the Road

Drive fuel-efficient vehicles or choose public transportation. Choose your bike or walk! Don't sit idle for more than 30 seconds. Keep your tires properly inflated.

With your Food Choices

Eat local- this helps cut down on production and transport! Reduce your meat and dairy. Compost to avoid food waste ending up in the landfill

With your Food Choices

Make energy-efficient choices for your appliances and lighting. Heat and cool efficiently! Change your air filters and program your thermostat, seal and insulate your home, and support clean energy sources

By Reducing Coastal Acidification

Reduce your use of fertilizers, Improve sewage treatment and run off, and Protect and restore coastal habitats

TAKE ACTION WITH YOUR COMMUNITY

You've taken the first step to learn more about ocean acidification - why not spread this knowledge to your community?

Every community has their unique culture, economy and ecology and what’s at stake from ocean acidification may be different depending on where you live.  As a community member, you can take a larger role in educating the public about ocean acidification. Creating awareness is the first step to taking action.  As communities gain traction, neighboring regions that share marine resources can build larger coalitions to address ocean acidification.  Here are some ideas to get started:

  1. Work with informal educators, such as aquarium outreach programs and local non-profits, to teach the public about ocean acidification. Visit our Education & Outreach page to find the newest tools!
  2. Participate in habitat restoration efforts to restore habitats that help mitigate the effects of coastal acidification
  3. Facilitate conversations with local businesses that might be affected by ocean acidification, building a plan for the future.
  4. Partner with local community efforts to mitigate the driver behind ocean acidification  – excess CO2 – such as community supported agriculture, bike & car shares and other public transportation options.
  5. Contact your regional Coastal Acidification Network (CAN) to learn how OA is affecting your region and more ideas about how you can get involved in your community
       More for Taking Community Action