Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals
1. The degree of individual specialization in resource use differs widely among wild populations where individuals range from fully generalized to highly specialized. This interindividual variation has profound implications in many ecological and evolutionary processes. A recent review proposed four...
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ftzenodo:oai:zenodo.org:4994050 2024-09-09T19:03:32+00:00 Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals Kernaléguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves 2016-01-28 https://doi.org/10.5061/dryad.k231g unknown Zenodo https://doi.org/10.1111/1365-2656.12347 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.k231g oai:zenodo.org:4994050 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode niche width Otariid foraging ecology Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker info:eu-repo/semantics/other 2016 ftzenodo https://doi.org/10.5061/dryad.k231g10.1111/1365-2656.12347 2024-07-25T20:40:55Z 1. The degree of individual specialization in resource use differs widely among wild populations where individuals range from fully generalized to highly specialized. This interindividual variation has profound implications in many ecological and evolutionary processes. A recent review proposed four main ecological causes of individual specialization: interspecific and intraspecific competition, ecological opportunity and predation. 2. Using the isotopic signature of subsampled whiskers, we investigated to what degree three of these factors (interspecific and intraspecific competition and ecological opportunity) affect the population niche width and the level of individual foraging specialization in two fur seal species, the Antarctic and subantarctic fur seals (Arctocephalus gazella and Arctocephalus tropicalis), over several years. 3. Population niche width was greater when the two seal species bred in allopatry (low interspecific competition) than in sympatry or when seals bred in high-density stabilized colonies (high intraspecific competition). In agreement with the niche variation hypothesis (NVH), higher population niche width was associated with higher interindividual niche variation. However, in contrast to the NVH, all Antarctic females increased their niche width during the interbreeding period when they had potential access to a wider diversity of foraging grounds and associated prey (high ecological opportunities), suggesting they all dispersed to a similar productive area. 4. The degree of individual specialization varied among populations and within the annual cycle. Highest levels of interindividual variation were found in a context of lower interspecific or higher intraspecific competition. Contrasted results were found concerning the effect of ecological opportunity. Depending on seal species, females exhibited either a greater or lower degree of individual specialization during the interbreeding period, reflecting species-specific biological constraints during that period. 5. These results ... Other/Unknown Material Antarc* Antarctic Arctocephalus gazella Zenodo Antarctic The Antarctic |
institution |
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collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
niche width Otariid foraging ecology Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker |
spellingShingle |
niche width Otariid foraging ecology Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker Kernaléguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
topic_facet |
niche width Otariid foraging ecology Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker |
description |
1. The degree of individual specialization in resource use differs widely among wild populations where individuals range from fully generalized to highly specialized. This interindividual variation has profound implications in many ecological and evolutionary processes. A recent review proposed four main ecological causes of individual specialization: interspecific and intraspecific competition, ecological opportunity and predation. 2. Using the isotopic signature of subsampled whiskers, we investigated to what degree three of these factors (interspecific and intraspecific competition and ecological opportunity) affect the population niche width and the level of individual foraging specialization in two fur seal species, the Antarctic and subantarctic fur seals (Arctocephalus gazella and Arctocephalus tropicalis), over several years. 3. Population niche width was greater when the two seal species bred in allopatry (low interspecific competition) than in sympatry or when seals bred in high-density stabilized colonies (high intraspecific competition). In agreement with the niche variation hypothesis (NVH), higher population niche width was associated with higher interindividual niche variation. However, in contrast to the NVH, all Antarctic females increased their niche width during the interbreeding period when they had potential access to a wider diversity of foraging grounds and associated prey (high ecological opportunities), suggesting they all dispersed to a similar productive area. 4. The degree of individual specialization varied among populations and within the annual cycle. Highest levels of interindividual variation were found in a context of lower interspecific or higher intraspecific competition. Contrasted results were found concerning the effect of ecological opportunity. Depending on seal species, females exhibited either a greater or lower degree of individual specialization during the interbreeding period, reflecting species-specific biological constraints during that period. 5. These results ... |
format |
Other/Unknown Material |
author |
Kernaléguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves |
author_facet |
Kernaléguen, Laëtitia Arnould, John P. Y. Guinet, Christophe Cherel, Yves |
author_sort |
Kernaléguen, Laëtitia |
title |
Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
title_short |
Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
title_full |
Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
title_fullStr |
Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
title_full_unstemmed |
Data from: Determinants of individual foraging specialisation in large marine vertebrates, the Antarctic and Subantarctic fur seals |
title_sort |
data from: determinants of individual foraging specialisation in large marine vertebrates, the antarctic and subantarctic fur seals |
publisher |
Zenodo |
publishDate |
2016 |
url |
https://doi.org/10.5061/dryad.k231g |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Arctocephalus gazella |
op_relation |
https://doi.org/10.1111/1365-2656.12347 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.k231g oai:zenodo.org:4994050 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.k231g10.1111/1365-2656.12347 |
_version_ |
1809817538920448000 |