Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands
Changes in the foraging environment and at-sea distribution of southern elephant seals from Kerguelen Islands were investigated over a decade (2004-2018) using tracking, weaning mass, and blood δ 13 C values. Females showed either a sub-Antarctic or an Antarctic foraging strategy, and no significant...
Published in: | Proceedings of the Royal Society B: Biological Sciences |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/082e7378-3a20-4c83-8c97-fd06991a991a 2024-09-15T17:45:37+00:00 Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands Mestre, Julie Authier, Matthieu Cherel, Yves Harcourt, Rob McMahon, Clive R. Hindell, Mark A. Charrassin, Jean Benoît Guinet, Christophe 2020-08-26 https://researchers.mq.edu.au/en/publications/082e7378-3a20-4c83-8c97-fd06991a991a https://doi.org/10.1098/rspb.2020.1544 http://www.scopus.com/inward/record.url?scp=85089632774&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Mestre , J , Authier , M , Cherel , Y , Harcourt , R , McMahon , C R , Hindell , M A , Charrassin , J B & Guinet , C 2020 , ' Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands ' , Proceedings. Biological sciences , vol. 287 , no. 1933 , 20201544 , pp. 1-10 . https://doi.org/10.1098/rspb.2020.1544 bio-logging decadal change foraging habitat Indian sector of the Southern Ocean population strategies stable isotopes article 2020 ftmacquarieunicr https://doi.org/10.1098/rspb.2020.1544 2024-07-31T23:49:40Z Changes in the foraging environment and at-sea distribution of southern elephant seals from Kerguelen Islands were investigated over a decade (2004-2018) using tracking, weaning mass, and blood δ 13 C values. Females showed either a sub-Antarctic or an Antarctic foraging strategy, and no significant shift in their at-sea distribution was detected between 2004 and 2017. The proportion of females foraging in sub-Antarctic versus Antarctic habitats did not change over the 2006-2018 period. Pup weaning mass varied according to the foraging habitat of their mothers. The weaning mass of sub-Antarctic foraging mothers' pups decreased by 11.7 kg over the study period, but they were on average 5.8 kg heavier than pups from Antarctic foraging mothers. Pup blood δ 13 C values decreased by 1.1‰ over the study period regardless of their sex and the presumed foraging habitat of their mothers. Together, these results suggest an ecological change is occurring within the Indian sector of the Southern Ocean with possible consequences on the foraging performance of southern elephant seals. We hypothesize that this shift in δ 13 C is related to a change in primary production and/or in the composition of phytoplankton communities, but this requires further multidisciplinary investigations. Article in Journal/Newspaper Antarc* Antarctic Elephant Seals Kerguelen Islands Southern Elephant Seals Southern Ocean Macquarie University Research Portal Proceedings of the Royal Society B: Biological Sciences 287 1933 20201544 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
bio-logging decadal change foraging habitat Indian sector of the Southern Ocean population strategies stable isotopes |
spellingShingle |
bio-logging decadal change foraging habitat Indian sector of the Southern Ocean population strategies stable isotopes Mestre, Julie Authier, Matthieu Cherel, Yves Harcourt, Rob McMahon, Clive R. Hindell, Mark A. Charrassin, Jean Benoît Guinet, Christophe Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
topic_facet |
bio-logging decadal change foraging habitat Indian sector of the Southern Ocean population strategies stable isotopes |
description |
Changes in the foraging environment and at-sea distribution of southern elephant seals from Kerguelen Islands were investigated over a decade (2004-2018) using tracking, weaning mass, and blood δ 13 C values. Females showed either a sub-Antarctic or an Antarctic foraging strategy, and no significant shift in their at-sea distribution was detected between 2004 and 2017. The proportion of females foraging in sub-Antarctic versus Antarctic habitats did not change over the 2006-2018 period. Pup weaning mass varied according to the foraging habitat of their mothers. The weaning mass of sub-Antarctic foraging mothers' pups decreased by 11.7 kg over the study period, but they were on average 5.8 kg heavier than pups from Antarctic foraging mothers. Pup blood δ 13 C values decreased by 1.1‰ over the study period regardless of their sex and the presumed foraging habitat of their mothers. Together, these results suggest an ecological change is occurring within the Indian sector of the Southern Ocean with possible consequences on the foraging performance of southern elephant seals. We hypothesize that this shift in δ 13 C is related to a change in primary production and/or in the composition of phytoplankton communities, but this requires further multidisciplinary investigations. |
format |
Article in Journal/Newspaper |
author |
Mestre, Julie Authier, Matthieu Cherel, Yves Harcourt, Rob McMahon, Clive R. Hindell, Mark A. Charrassin, Jean Benoît Guinet, Christophe |
author_facet |
Mestre, Julie Authier, Matthieu Cherel, Yves Harcourt, Rob McMahon, Clive R. Hindell, Mark A. Charrassin, Jean Benoît Guinet, Christophe |
author_sort |
Mestre, Julie |
title |
Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
title_short |
Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
title_full |
Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
title_fullStr |
Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
title_full_unstemmed |
Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands |
title_sort |
decadal changes in blood δ 13 c values, at-sea distribution, and weaning mass of southern elephant seals from kerguelen islands |
publishDate |
2020 |
url |
https://researchers.mq.edu.au/en/publications/082e7378-3a20-4c83-8c97-fd06991a991a https://doi.org/10.1098/rspb.2020.1544 http://www.scopus.com/inward/record.url?scp=85089632774&partnerID=8YFLogxK |
genre |
Antarc* Antarctic Elephant Seals Kerguelen Islands Southern Elephant Seals Southern Ocean |
genre_facet |
Antarc* Antarctic Elephant Seals Kerguelen Islands Southern Elephant Seals Southern Ocean |
op_source |
Mestre , J , Authier , M , Cherel , Y , Harcourt , R , McMahon , C R , Hindell , M A , Charrassin , J B & Guinet , C 2020 , ' Decadal changes in blood δ 13 C values, at-sea distribution, and weaning mass of southern elephant seals from Kerguelen Islands ' , Proceedings. Biological sciences , vol. 287 , no. 1933 , 20201544 , pp. 1-10 . https://doi.org/10.1098/rspb.2020.1544 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1098/rspb.2020.1544 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
287 |
container_issue |
1933 |
container_start_page |
20201544 |
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1810493507908927488 |