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Coastal polynyas: Winter oases for subadult southern elephant seals in East Antarctica

Artikel i vetenskaplig tidskrift
Författare Sara Labrousse
Guy Williams
Takeshi Tamura
Sophie Bestley
Jean Baptiste Sallée
Alexander D. Fraser
Michael Sumner
Fabien Roquet
Karine Heerah
Baptiste Picard
Christophe Guinet
Robert Harcourt
Clive McMahon
Mark A. Hindell
Jean Benoit Charrassin
Publicerad i Scientific Reports
Volym 8
Publiceringsår 2018
Publicerad vid
Språk en
Ämneskategorier Oceanografi, Klimatforskning, Etologi

Sammanfattning

© 2018 The Author(s). Antarctic coastal polynyas are regions of persistent open water and are thought to be key bio-physical features within the sea-ice zone. However, their use by the upper trophic levels of ecosystems remains unclear. A unique bio-physical dataset recorded by southern elephant seals reveals that East Antarctic polynyas are a key winter foraging habitat for male seals. During their post-moult trips from Isles Kerguelen to the Antarctic continental shelf, a total of 18 out of 23 seals visited 9 different polynyas, spending on average 25 ± 20% (up to 75%) of their total trip time inside polynyas. Changes in seal foraging and diving behaviours are observed inside polynyas as compared to outside polynyas. Two polynya usages by seals are observed for the inactive and active polynya phases, pointing to different seasonal peaks in prey abundance. During the active polynya phase, we link seal foraging behaviour to changes in the physical stability of the water-column, which likely impact the seasonal biological dynamics within polynyas.

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