Articles | Volume 22, issue 21
https://doi.org/10.5194/bg-22-6583-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-6583-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Nov 2025
Research article |
| 07 Nov 2025
| 07 Nov 2025
Marine heatwaves deeply alter marine food web structure and function
Vianney Guibourd de Luzinais
CORRESPONDING AUTHOR
UMR Dynamics and Sustainability of Ecosystems: From Source to Sea (DECOD), Institut Agro, Ifremer, INRAE, Rennes, France
Institute for the Oceans and Fisheries, The University of British Columbia, Vancouver, British Columbia, Canada
William W. L. Cheung
Institute for the Oceans and Fisheries, The University of British Columbia, Vancouver, British Columbia, Canada
Didier Gascuel
UMR Dynamics and Sustainability of Ecosystems: From Source to Sea (DECOD), Institut Agro, Ifremer, INRAE, Rennes, France
Related authors
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Anne L. Morée, Fabrice Lacroix, William W. L. Cheung, and Thomas L. Frölicher
Biogeosciences, 22, 1115–1133, https://doi.org/10.5194/bg-22-1115-2025, https://doi.org/10.5194/bg-22-1115-2025, 2025
Short summary
Short summary
Using novel Earth system model simulations and applying the Aerobic Growth Index, we show that only about half of the habitat loss for marine species is realized when temperature stabilization is initially reached. The maximum habitat loss happens over a century after peak warming in a temperature overshoot scenario peaking at 2 °C before stabilizing at 1.5 °C. We also emphasize that species adaptation may be key in mitigating the long-term impacts of temperature stabilization and overshoot.
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Short summary
Marine heatwaves (MHWs) have become more frequent and intense, yet their impacts on marine ecosystems globally remain unclear. Using a novel ecological model, we show that MHWs significantly reduced marine ecosystem biomass between 1998 and 2021, especially in the North Pacific Ocean. Marine predators are more impacted than organisms lower in the food chain. This study underscores the urgent need to integrate MHWs into developing climate-resilient marine ecosystem management and conservation plans.
Marine heatwaves (MHWs) have become more frequent and intense, yet their impacts on marine...
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