Antarctic phytoplankton communities restructure under shifting sea-ice regimes

Alexander Hayward (), Simon W. Wright, Dustin Carroll, Cliff S. Law, Pat Wongpan, Andrés Gutiérrez-Rodriguez and Matthew H. Pinkerton
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Alexander Hayward: Danish Meteorological Institute
Simon W. Wright: University of Tasmania
Dustin Carroll: Moss Landing Marine Laboratories
Cliff S. Law: Earth Sciences New Zealand (formerly NIWA)
Pat Wongpan: University of Tasmania
Andrés Gutiérrez-Rodriguez: Earth Sciences New Zealand (formerly NIWA)
Matthew H. Pinkerton: Earth Sciences New Zealand (formerly NIWA)

Nature Climate Change, 2025, vol. 15, issue 8, 889-896

Abstract: Abstract Phytoplankton are critical to the Antarctic marine food web and associated biological carbon pump, yet long-term shifts in their community composition are poorly understood. Here, using a machine learning framework and combining pigment samples and environmental samples from austral summertime 1997–2023, we show declines in diatoms and increases in haptophytes and cryptophytes across much of Antarctica’s continental shelf. These trends—which are linked to sea ice increases—reversed after 2016, with a rebound in diatoms and a large increase in cryptophytes, coinciding with the loss of sea ice. Significant changes (P

Date: 2025
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DOI: 10.1038/s41558-025-02379-x

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