Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals
International audience 1. The degree of individual specialization in resource use differs widely among wild populationswhere individuals range from fully generalized to highly specialized. This interindividualvariation has profound implications in many ecological and evolutionary processes. A recent...
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ftunivrochelle:oai:HAL:hal-01224161v1 2024-02-11T09:58:13+01:00 Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals Kernaleguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves School of Life and Environmental Sciences Deakin University Burwood Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) 2015-01-23 https://hal.science/hal-01224161 https://doi.org/10.1111/1365-2656.12347 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/1365-2656.12347 hal-01224161 https://hal.science/hal-01224161 doi:10.1111/1365-2656.12347 ISSN: 0021-8790 EISSN: 1365-2656 Journal of Animal Ecology https://hal.science/hal-01224161 Journal of Animal Ecology, 2015, 84, pp.1081-1091. ⟨10.1111/1365-2656.12347⟩ competition diet foraging ecology niche variation hypothesis niche width otariid pinniped stable isotopes vibrissae whisker [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2015 ftunivrochelle https://doi.org/10.1111/1365-2656.12347 2024-01-23T23:35:53Z International audience 1. The degree of individual specialization in resource use differs widely among wild populationswhere individuals range from fully generalized to highly specialized. This interindividualvariation has profound implications in many ecological and evolutionary processes. A recentreview proposed four main ecological causes of individual specialization: interspecific andintraspecific competition, ecological opportunity and predation.2. Using the isotopic signature of subsampled whiskers, we investigated to what degree threeof these factors (interspecific and intraspecific competition and ecological opportunity) affectthe population niche width and the level of individual foraging specialization in two fur sealspecies, the Antarctic and subantarctic fur seals (Arctocephalus gazella and Arctocephalustropicalis), over several years.3. Population niche width was greater when the two seal species bred in allopatry (low interspecificcompetition) than in sympatry or when seals bred in high-density stabilized colonies (highintraspecific competition). In agreement with the niche variation hypothesis (NVH), higherpopulation niche width was associated with higher interindividual niche variation. However, incontrast to the NVH, all Antarctic females increased their niche width during the interbreedingperiod when they had potential access to a wider diversity of foraging grounds and associatedprey (high ecological opportunities), suggesting they all dispersed to a similar productive area.4. The degree of individual specialization varied among populations and within the annualcycle. Highest levels of interindividual variation were found in a context of lower interspecificor higher intraspecific competition. Contrasted results were found concerning the effect ofecological opportunity. Depending on seal species, females exhibited either a greater or lowerdegree of individual specialization during the interbreeding period, reflecting species-specificbiological constraints during that period.5. These results ... Article in Journal/Newspaper Antarc* Antarctic Arctocephalus gazella HAL - Université de La Rochelle Antarctic The Antarctic Journal of Animal Ecology 84 4 1081 1091 |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
competition diet foraging ecology niche variation hypothesis niche width otariid pinniped stable isotopes vibrissae whisker [SDE]Environmental Sciences |
spellingShingle |
competition diet foraging ecology niche variation hypothesis niche width otariid pinniped stable isotopes vibrissae whisker [SDE]Environmental Sciences Kernaleguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
topic_facet |
competition diet foraging ecology niche variation hypothesis niche width otariid pinniped stable isotopes vibrissae whisker [SDE]Environmental Sciences |
description |
International audience 1. The degree of individual specialization in resource use differs widely among wild populationswhere individuals range from fully generalized to highly specialized. This interindividualvariation has profound implications in many ecological and evolutionary processes. A recentreview proposed four main ecological causes of individual specialization: interspecific andintraspecific competition, ecological opportunity and predation.2. Using the isotopic signature of subsampled whiskers, we investigated to what degree threeof these factors (interspecific and intraspecific competition and ecological opportunity) affectthe population niche width and the level of individual foraging specialization in two fur sealspecies, the Antarctic and subantarctic fur seals (Arctocephalus gazella and Arctocephalustropicalis), over several years.3. Population niche width was greater when the two seal species bred in allopatry (low interspecificcompetition) than in sympatry or when seals bred in high-density stabilized colonies (highintraspecific competition). In agreement with the niche variation hypothesis (NVH), higherpopulation niche width was associated with higher interindividual niche variation. However, incontrast to the NVH, all Antarctic females increased their niche width during the interbreedingperiod when they had potential access to a wider diversity of foraging grounds and associatedprey (high ecological opportunities), suggesting they all dispersed to a similar productive area.4. The degree of individual specialization varied among populations and within the annualcycle. Highest levels of interindividual variation were found in a context of lower interspecificor higher intraspecific competition. Contrasted results were found concerning the effect ofecological opportunity. Depending on seal species, females exhibited either a greater or lowerdegree of individual specialization during the interbreeding period, reflecting species-specificbiological constraints during that period.5. These results ... |
author2 |
School of Life and Environmental Sciences Deakin University Burwood Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Kernaleguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves |
author_facet |
Kernaleguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves |
author_sort |
Kernaleguen, Laëtitia |
title |
Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
title_short |
Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
title_full |
Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
title_fullStr |
Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
title_full_unstemmed |
Determinants of individual foraging specialization in large marine vertebrates, the Antarctic and subantarctic fur seals |
title_sort |
determinants of individual foraging specialization in large marine vertebrates, the antarctic and subantarctic fur seals |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01224161 https://doi.org/10.1111/1365-2656.12347 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Arctocephalus gazella |
op_source |
ISSN: 0021-8790 EISSN: 1365-2656 Journal of Animal Ecology https://hal.science/hal-01224161 Journal of Animal Ecology, 2015, 84, pp.1081-1091. ⟨10.1111/1365-2656.12347⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/1365-2656.12347 hal-01224161 https://hal.science/hal-01224161 doi:10.1111/1365-2656.12347 |
op_doi |
https://doi.org/10.1111/1365-2656.12347 |
container_title |
Journal of Animal Ecology |
container_volume |
84 |
container_issue |
4 |
container_start_page |
1081 |
op_container_end_page |
1091 |
_version_ |
1790593827320365056 |