Biogeosciences
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Articles | Volume 22, issue 21
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.
https://doi.org/10.5194/bg-22-6583-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 21
Research article
 | 
07 Nov 2025
Research article |  | 07 Nov 2025

Marine heatwaves deeply alter marine food web structure and function

Vianney Guibourd de Luzinais, William W. L. Cheung, and Didier Gascuel

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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.
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