Observed Emperor Penguin Population Decline Double that of Projections

Communications Earth and Environment, 10 June 2025

Emperor penguin populations in Antarctica have declined two times faster than previously predicted since the turn of the century, indicating a worrying loss of habitat and resources as temperatures rise. High-resolution satellite imagery focused on the Antarctic Peninsula, Weddell Sea, and Bellingshausen Sea regions finds that populations shrunk by 22% between 2009 and 2023, double previous estimates. Colonies from the study’s focus areas account for nearly a third of all emperor penguins. They are disappearing faster than what climate models estimated even under high warming scenarios. These observed population drops likely have been caused by higher than projected Antarctic sea ice loss since 2018, as sea ice provides a critical habitat for this and other penguin species. Ocean and atmospheric warming places extreme pressure on endangered and specially-adapted ecosystems worldwide that rely on cooler conditions or the presence of snow and ice to gather nutrients, reside, and raise their young.

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