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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ftdans:oai:easy.dans.knaw.nl:easy-dataset:88262 2023-07-02T03:29:41+02:00 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 2015-02-12T21:06:54.000+01:00 http://nbn-resolving.org/urn:nbn:nl:ui:13-pv-on9q https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:88262 unknown doi:10.5061/dryad.k231g/1 doi:10.1111/1365-2656.12347 PMID:25649011 http://nbn-resolving.org/urn:nbn:nl:ui:13-pv-on9q doi:10.5061/dryad.k231g https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:88262 OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf Life sciences medicine and health care 2015 ftdans https://doi.org/10.5061/dryad.k231g/110.1111/1365-2656.1234710.5061/dryad.k231g 2023-06-13T13:18:18Z 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 Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) Antarctic The Antarctic |
institution |
Open Polar |
collection |
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) |
op_collection_id |
ftdans |
language |
unknown |
topic |
Life sciences medicine and health care |
spellingShingle |
Life sciences medicine and health care 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 |
Life sciences medicine and health care |
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 ... |
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 |
publishDate |
2015 |
url |
http://nbn-resolving.org/urn:nbn:nl:ui:13-pv-on9q https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:88262 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Arctocephalus gazella |
op_relation |
doi:10.5061/dryad.k231g/1 doi:10.1111/1365-2656.12347 PMID:25649011 http://nbn-resolving.org/urn:nbn:nl:ui:13-pv-on9q doi:10.5061/dryad.k231g https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:88262 |
op_rights |
OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf |
op_doi |
https://doi.org/10.5061/dryad.k231g/110.1111/1365-2656.1234710.5061/dryad.k231g |
_version_ |
1770271920393027584 |