Climate Impacts on Bering Sea Marine Ecosystems

The Bering Sea hosts one of the world’s most productive and dynamic marine ecosystems, characterised by seasonal sea-ice cover, a distinctive “cold pool” of bottom water, and a rich foodweb sustaining fish, seabirds and marine mammals. Climate warming has led to reduced winter sea-ice extent, shifts in stratification and altered timing of phytoplankton blooms. These physical changes propagate through the foodweb, affecting zooplankton community composition, the distribution and abundance of forage species, and ultimately the productivity of commercially important fish stocks. Warming trends and diminished ice cover have driven poleward range expansions of subarctic species, declines in energy-rich large zooplankton, and increased spatial overlap between predators and juvenile fish. The combined effects of altering prey quality, modified predator–prey interactions and changing biogeochemical cycles pose challenges for fisheries management, indigenous communities and conservation of higher trophic levels. Integrated modelling frameworks and more refined projections of regional oceanography are beginning to guide adaptive strategies that balance exploitation and ecosystem health under future climate scenarios.

Research from Nature Portfolio

Recent studies demonstrate that ecosystem-based fisheries management can buffer near-term declines in key Bering Sea fisheries under moderate warming but offers limited protection under high-emission scenarios. Modelling analyses indicate a critical bottom-temperature threshold (~2.1 °C) above which gadid biomasses, especially pollock and cod, undergo rapid collapse. Simulations reveal that ice-driven shifts in energy flow from benthic to pelagic compartments temporarily enhance recruitment of some species, yet prolonged warm periods reverse these gains by reducing lipid-rich prey and increasing predation on vulnerable juveniles. The work underlines the value of management strategies that account for species interactions, temperature-dependent processes and the timing of multiyear thermal stanzas.

Climate Impacts on Bering Sea Marine Ecosystems publication trend

The graph below shows the total number of articles in climate impacts on bering sea marine ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Cold pool: A persistent layer of near-bottom water at approximately 0–2 °C that forms under sea ice and influences species distributions and predator–prey interactions.

Ecosystem-based fisheries management (EBFM): An approach that integrates ecological relationships, species interactions and environmental drivers into fisheries decision-making to sustain overall ecosystem health.

Species distribution model (SDM): A quantitative tool that relates observed occurrences of a species to environmental variables to project its potential spatial distribution under future conditions.

Dynamical downscaling: A method in which high-resolution regional climate or ocean models are driven by coarser global models to better resolve local physical processes.

References

1. Ecosystem-based fisheries management forestalls climate-driven collapse. Nature Communications (2020).
2. Recommendations for quantifying and reducing uncertainty in climate projections of species distributions. Global Change Biology (2022).
3. A coupled pelagic–benthic–sympagic biogeochemical model for the Bering Sea: documentation and validation of the BESTNPZ model (v2019.08.23) within a high-resolution regional ocean model. Geoscientific Model Development (2020).
4. Integrated Modeling to Evaluate Climate Change Impacts on Coupled Social-Ecological Systems in Alaska. Frontiers in Marine Science (2020).
5. Genetic evidence of a northward range expansion in the eastern Bering Sea stock of Pacific cod. Evolutionary Applications (2019).
6. Climate impacts on eastern Bering Sea foodwebs: a synthesis of new data and an assessment of the Oscillating Control Hypothesis. ICES Journal of Marine Science (2011).
7. Next-generation regional ocean projections for living marine resource management in a changing climate. ICES Journal of Marine Science (2021).
8. Climate and Demography Dictate the Strength of Predator-Prey Overlap in a Subarctic Marine Ecosystem. PLOS ONE (2013).