Weddell seal behaviour during an exceptional oceanographic event in the Filchner-Ronne Ice Shelf in 2017

Rapid and regionally contrasting climate changes have been observed around Antarctica. However, our understanding of the impact of these changes on ecosystems remains limited, and there is an urgent need to better identify habitats of Antarctic species. The Weddell seal (Leptonychotes weddellii) is...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Labrousse, S, Ryan, S, Roquet, F, Picard, B, McMahon, CR, Harcourt, R, Hindell, M, Le Goff, H, Lourenco, A, David, Y, Sallee, JB, Charrassin, JB
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge Univ Press 2021
Subjects:
Antarctic predators
bio-telemetry
foraging behaviour
physical oceanography
spatial ecology
Weddell Sea
Antarctic
East Antarctica
Ross Sea
Weddell
Ronne Ice Shelf
Antarc*
Antarctic Science
Antarctica
Filchner Ronne Ice Shelf
Filchner-Ronne Ice Shelf
Ice Shelf
Weddell Seal
Weddell Seals
Online Access:https://eprints.utas.edu.au/47001/
https://eprints.utas.edu.au/47001/1/150267%20-%20Weddell%20seal%20behaviour%20during%20an%20exceptional%20oceanographic.pdf
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Summary:Rapid and regionally contrasting climate changes have been observed around Antarctica. However, our understanding of the impact of these changes on ecosystems remains limited, and there is an urgent need to better identify habitats of Antarctic species. The Weddell seal (Leptonychotes weddellii) is a circumpolar mesopredator and an indicative species of Antarctic marine communities. It has been extensively studied in the western Ross Sea and East Antarctica, and an understanding of its ecology in the Weddell Sea in the wintertime is emerging. We documented the behavioural response(s) of four Weddell seals from February to June in 2017 in the Filchner-Ronne Ice Shelf region and related these to unusual oceanographic conditions in 2017. Unexpectedly, we found that Weddell seals had the longest foraging effort within the outflow of Ice Shelf Water or at its turbulent boundary. They also foraged on the eastern side of the trough from April to June within the Modified Warm Deep Water and seem to take advantage of the unusual conditions of persistent inflow of warm waters through the winter. Linking animal behavioural responses to oceanographic conditions is informative for quantifying rarely recorded events and provides great insight into how predators may respond to changing conditions.

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