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

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

doi:10.5194/bg-22-7205-2025

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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Oct 2025	144	52	8	204
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Dec 2025	314	162	31	507
Jan 2026	259	115	23	397
Feb 2026	190	135	14	339
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Cumulative views and downloads (calculated since 01 Jul 2025)

Month	HTML	PDF	XML	Total
Jul 2025	374	48	18	440
Aug 2025	338	32	8	378
Sep 2025	1,150	36	18	1,204
Oct 2025	144	52	8	204
Nov 2025	334	101	15	450
Dec 2025	314	162	31	507
Jan 2026	259	115	23	397
Feb 2026	190	135	14	339
Mar 2026	223	107	12	342
Apr 2026	153	91	17	261
May 2026	97	38	10	145
Jun 2026	25	5	2	32

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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.