Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands
International audience Highly dimorphic species like southern elephant seals (Mirounga leonina, SES hereafter) frequently exhibit resource partitioning according to sex and/or age classes. We measured carbon and nitrogen stable isotopes (δ13C and δ15N) of 404 blood samples (136 males and 268 females...
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ftunivnantes:oai:HAL:hal-00624915v1 2023-05-15T14:00:09+02:00 Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands Chaigne, Adrien Authier, Matthieu Richard, Pierre Cherel, Yves Guinet, Christophe Centre d'Études Biologiques de Chizé (CEBC) Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.science/hal-00624915 https://doi.org/10.1007/s00227-012-2149-5 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-012-2149-5 hal-00624915 https://hal.science/hal-00624915 doi:10.1007/s00227-012-2149-5 ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00624915 Marine Biology, 2013, 160, pp.977-986. ⟨10.1007/s00227-012-2149-5⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2013 ftunivnantes https://doi.org/10.1007/s00227-012-2149-5 2023-03-08T00:17:34Z International audience Highly dimorphic species like southern elephant seals (Mirounga leonina, SES hereafter) frequently exhibit resource partitioning according to sex and/or age classes. We measured carbon and nitrogen stable isotopes (δ13C and δ15N) of 404 blood samples (136 males and 268 females from Kerguelen Islands, 49°21′S, 70°18′E) from 2004 to 2011. Assuming that the distribution of carbon isotopes (δ13C value) reflects the two main foraging grounds (Polar Frontal and Antarctic Zones), we quantified the proportion of SES foraging within each zone in relation with size, a proxy for their age. We found a clear shift from Polar Frontal to Antarctic waters as male SES aged, but no relation as far as females is concerned. We also observed a widening range of nitrogen isotopic (δ15N) values, suggesting that both males and females expanded their diet spectra with age. Whereas males increased their trophic level, females remained constant on average, with some adult females feeding both at lower and at higher trophic levels than juveniles. Article in Journal/Newspaper Antarc* Antarctic Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals Université de Nantes: HAL-UNIV-NANTES Antarctic Kerguelen Kerguelen Islands Marine Biology 160 4 977 986 |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Chaigne, Adrien Authier, Matthieu Richard, Pierre Cherel, Yves Guinet, Christophe Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Highly dimorphic species like southern elephant seals (Mirounga leonina, SES hereafter) frequently exhibit resource partitioning according to sex and/or age classes. We measured carbon and nitrogen stable isotopes (δ13C and δ15N) of 404 blood samples (136 males and 268 females from Kerguelen Islands, 49°21′S, 70°18′E) from 2004 to 2011. Assuming that the distribution of carbon isotopes (δ13C value) reflects the two main foraging grounds (Polar Frontal and Antarctic Zones), we quantified the proportion of SES foraging within each zone in relation with size, a proxy for their age. We found a clear shift from Polar Frontal to Antarctic waters as male SES aged, but no relation as far as females is concerned. We also observed a widening range of nitrogen isotopic (δ15N) values, suggesting that both males and females expanded their diet spectra with age. Whereas males increased their trophic level, females remained constant on average, with some adult females feeding both at lower and at higher trophic levels than juveniles. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Chaigne, Adrien Authier, Matthieu Richard, Pierre Cherel, Yves Guinet, Christophe |
author_facet |
Chaigne, Adrien Authier, Matthieu Richard, Pierre Cherel, Yves Guinet, Christophe |
author_sort |
Chaigne, Adrien |
title |
Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
title_short |
Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
title_full |
Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
title_fullStr |
Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
title_full_unstemmed |
Shift in foraging ground and diet broadening during ontogeny in southern elephant seals from Kerguelen islands |
title_sort |
shift in foraging ground and diet broadening during ontogeny in southern elephant seals from kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-00624915 https://doi.org/10.1007/s00227-012-2149-5 |
geographic |
Antarctic Kerguelen Kerguelen Islands |
geographic_facet |
Antarctic Kerguelen Kerguelen Islands |
genre |
Antarc* Antarctic Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals |
genre_facet |
Antarc* Antarctic Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals |
op_source |
ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-00624915 Marine Biology, 2013, 160, pp.977-986. ⟨10.1007/s00227-012-2149-5⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-012-2149-5 hal-00624915 https://hal.science/hal-00624915 doi:10.1007/s00227-012-2149-5 |
op_doi |
https://doi.org/10.1007/s00227-012-2149-5 |
container_title |
Marine Biology |
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160 |
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4 |
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977 |
op_container_end_page |
986 |
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1766269142295379968 |