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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
9 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number3183
Pages (from-to)1-15
Number of pages15
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 16 Feb 2018

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Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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