Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers
International audience Background: Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals. Methodology/...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00679685 https://doi.org/10.1371/journal.pone.0032916 |
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ftccsdartic:oai:HAL:hal-00679685v1 2023-05-15T13:54:40+02:00 Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers Kernaléguen, Laeticia Cazelles, Bernard Arnould, John P.Y. Richard, Pierre Guinet, Christophe Cherel, Yves Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Institut de Recherche pour le Développement (IRD France-Nord ) Laboratoire Ecologie et évolution École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) School of Life and Environmental Sciences Deakin University Burwood LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) 2012-03-14 https://hal.archives-ouvertes.fr/hal-00679685 https://doi.org/10.1371/journal.pone.0032916 en eng HAL CCSD Public Library of Science info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0032916 hal-00679685 https://hal.archives-ouvertes.fr/hal-00679685 doi:10.1371/journal.pone.0032916 ISSN: 1932-6203 EISSN: 1932-6203 PLoS ONE https://hal.archives-ouvertes.fr/hal-00679685 PLoS ONE, Public Library of Science, 2012, 7 (3), pp.e32916. ⟨10.1371/journal.pone.0032916⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1371/journal.pone.0032916 2021-11-21T04:11:55Z International audience Background: Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals. Methodology/Principal Findings: The foraging strategies of sympatric fur seals (Arctocephalus gazella and A. tropicalis) were examined using the stable isotope signature of serially sampled whiskers. Most whiskers exhibited synchronous d13C and d15N oscillations that correspond to the seal annual movements over the long term (up to 8 years). d13C and d15N values were spread over large ranges, with differences between species, sexes and individuals. The main segregating mechanism operates at the spatial scale. Most seals favored foraging in subantarctic waters (where the Crozet Islands are located) where they fed on myctophids. However, A. gazella dispersed in the Antarctic Zone and A. tropicalis more in the subtropics. Gender differences in annual time budget shape the seal movements. Males that do not perform any parental care exhibited large isotopic oscillations reflecting broad annual migrations, while isotopic values of females confined to a limited foraging range during lactation exhibited smaller changes. Limited inter-individual isotopic variations occurred in female seals and in male A. tropicalis. In contrast, male A. gazella showed large inter-individual variations, with some males migrating repeatedly to high-Antarctic waters where they fed on krill, thus meaning that individual specialization occurred over years. Conclusions/Significance: Whisker isotopic signature yields unique long-term information on individual behaviour that integrates the spatial, trophic and temporal dimensions of the ecological niche. The method allows depicting the entire realized niche of the species, including some of its less well-known components such as age-, sex-, individual- and migration-related changes. It highlights ... Article in Journal/Newspaper Antarc* Antarctic Arctocephalus gazella Crozet Islands Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic PLoS ONE 7 3 e32916 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Kernaléguen, Laeticia Cazelles, Bernard Arnould, John P.Y. Richard, Pierre Guinet, Christophe Cherel, Yves Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Background: Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals. Methodology/Principal Findings: The foraging strategies of sympatric fur seals (Arctocephalus gazella and A. tropicalis) were examined using the stable isotope signature of serially sampled whiskers. Most whiskers exhibited synchronous d13C and d15N oscillations that correspond to the seal annual movements over the long term (up to 8 years). d13C and d15N values were spread over large ranges, with differences between species, sexes and individuals. The main segregating mechanism operates at the spatial scale. Most seals favored foraging in subantarctic waters (where the Crozet Islands are located) where they fed on myctophids. However, A. gazella dispersed in the Antarctic Zone and A. tropicalis more in the subtropics. Gender differences in annual time budget shape the seal movements. Males that do not perform any parental care exhibited large isotopic oscillations reflecting broad annual migrations, while isotopic values of females confined to a limited foraging range during lactation exhibited smaller changes. Limited inter-individual isotopic variations occurred in female seals and in male A. tropicalis. In contrast, male A. gazella showed large inter-individual variations, with some males migrating repeatedly to high-Antarctic waters where they fed on krill, thus meaning that individual specialization occurred over years. Conclusions/Significance: Whisker isotopic signature yields unique long-term information on individual behaviour that integrates the spatial, trophic and temporal dimensions of the ecological niche. The method allows depicting the entire realized niche of the species, including some of its less well-known components such as age-, sex-, individual- and migration-related changes. It highlights ... |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Institut de Recherche pour le Développement (IRD France-Nord ) Laboratoire Ecologie et évolution École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) School of Life and Environmental Sciences Deakin University Burwood LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Kernaléguen, Laeticia Cazelles, Bernard Arnould, John P.Y. Richard, Pierre Guinet, Christophe Cherel, Yves |
author_facet |
Kernaléguen, Laeticia Cazelles, Bernard Arnould, John P.Y. Richard, Pierre Guinet, Christophe Cherel, Yves |
author_sort |
Kernaléguen, Laeticia |
title |
Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
title_short |
Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
title_full |
Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
title_fullStr |
Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
title_full_unstemmed |
Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers |
title_sort |
long-term species, sexual and individual variations in foraging strategies of fur seals revealed by stable isotopes in whiskers |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.archives-ouvertes.fr/hal-00679685 https://doi.org/10.1371/journal.pone.0032916 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctocephalus gazella Crozet Islands |
genre_facet |
Antarc* Antarctic Arctocephalus gazella Crozet Islands |
op_source |
ISSN: 1932-6203 EISSN: 1932-6203 PLoS ONE https://hal.archives-ouvertes.fr/hal-00679685 PLoS ONE, Public Library of Science, 2012, 7 (3), pp.e32916. ⟨10.1371/journal.pone.0032916⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0032916 hal-00679685 https://hal.archives-ouvertes.fr/hal-00679685 doi:10.1371/journal.pone.0032916 |
op_doi |
https://doi.org/10.1371/journal.pone.0032916 |
container_title |
PLoS ONE |
container_volume |
7 |
container_issue |
3 |
container_start_page |
e32916 |
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1766260721143775232 |