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...
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ftpubmed:oai:pubmedcentral.nih.gov:7482287 2023-05-15T13:33:11+02:00 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 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7482287/ http://www.ncbi.nlm.nih.gov/pubmed/32811318 https://doi.org/10.1098/rspb.2020.1544 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7482287/ http://www.ncbi.nlm.nih.gov/pubmed/32811318 http://dx.doi.org/10.1098/rspb.2020.1544 © 2020 The Author(s) https://royalsociety.org/-/media/journals/author/Licence-to-Publish-20062019-final.pdfhttps://royalsociety.org/journals/ethics-policies/data-sharing-mining/Published by the Royal Society. All rights reserved. Proc Biol Sci Ecology Text 2020 ftpubmed https://doi.org/10.1098/rspb.2020.1544 2021-08-29T00:20:11Z 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. Text Antarc* Antarctic Elephant Seals Kerguelen Islands Southern Elephant Seals Southern Ocean PubMed Central (PMC) Antarctic Indian Kerguelen Kerguelen Islands Southern Ocean Proceedings of the Royal Society B: Biological Sciences 287 1933 20201544 |
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English |
topic |
Ecology |
spellingShingle |
Ecology 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 |
Ecology |
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 |
Text |
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 |
publisher |
The Royal Society |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7482287/ http://www.ncbi.nlm.nih.gov/pubmed/32811318 https://doi.org/10.1098/rspb.2020.1544 |
geographic |
Antarctic Indian Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Antarctic Indian Kerguelen Kerguelen Islands Southern Ocean |
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 |
Proc Biol Sci |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7482287/ http://www.ncbi.nlm.nih.gov/pubmed/32811318 http://dx.doi.org/10.1098/rspb.2020.1544 |
op_rights |
© 2020 The Author(s) https://royalsociety.org/-/media/journals/author/Licence-to-Publish-20062019-final.pdfhttps://royalsociety.org/journals/ethics-policies/data-sharing-mining/Published by the Royal Society. All rights reserved. |
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 |
_version_ |
1766039310775091200 |