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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.

Item Type:	Article
Authors/Creators:	Labrousse, S and Williams, G and Tamura, T and Bestley, S and Sallee, J-B and Fraser, AD and Sumner, M and Roquet, F and Heerah, K and Picard, B and Guinet, C and Harcourt, R and McMahon, C and Hindell, MA and Charrassin, J-B
Keywords:	Southern Ocean, ecosystems, tracking, elephant seals, Antarctica, polynyas
Journal or Publication Title:	Scientific Reports
Publisher:	Nature Publishing Group
ISSN:	2045-2322
DOI / ID Number:	10.1038/s41598-018-21388-9
Copyright Information:	Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
Related URLs:	Google Scholar: Williams, G UTAS Profile: Williams, G Google Scholar: Bestley, S UTAS Profile: Bestley, S Google Scholar: Fraser, AD UTAS Profile: McMahon, C Google Scholar: Hindell, MA UTAS Profile: Hindell, MA
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