Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 22
Articles | Volume 22, issue 22
https://doi.org/10.5194/bg-22-7205-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-7205-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 22
Research article
 | 
25 Nov 2025
Research article |  | 25 Nov 2025

Response of phytoplankton communities to the onset of the 2020 summer marine heatwave in the Drake Passage and Antarctic Peninsula

Andrés S. Rigual-Hernández, Amy Leventer, Manuel Fernández-Barba, José A. Flores, Gabriel Navarro, Johan Etourneau, Dimitris Evangelinos, Megan Duffy, Carlota Escutia, Fernando Bohoyo, José M. Sánchez-Santos, Manon Sabourdy, Francisco J. Jiménez-Espejo, and María A. Bárcena

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Short summary
We studied the abundance and composition of key phytoplankton groups in the Drake Passage and Antarctic Peninsula before and during a marine heatwave in summer 2020. An anticyclonic eddy transported warmer waters into the southern Drake Passage. This led to higher diatom abundance and an increase in the abundance of a small diatom species in the southern Drake Passage while reducing coccolithophore populations. The consequences on marine ecosystems and biogeochemical cycles remain uncertain.
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