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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fttriple:oai:gotriple.eu:50|dedup_wf_001::66f54d825e328656c2ec1fa870782a08 2023-05-15T13:57:13+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 2015-01-01 https://doi.org/10.5061/dryad.k231g undefined unknown http://dx.doi.org/10.5061/dryad.k231g https://dx.doi.org/10.5061/dryad.k231g lic_creative-commons oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:88262 10.5061/dryad.k231g oai:easy.dans.knaw.nl:easy-dataset:88262 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 re3data_____::r3d100000044 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c Life sciences medicine and health care competition niche width diet Otariid foraging ecology stable isotopes Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker pinniped Crozet Kerguelen Amsterdam envir geo Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2015 fttriple https://doi.org/10.5061/dryad.k231g 2023-01-22T16:52:27Z 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 ... Dataset Antarc* Antarctic Arctocephalus gazella Unknown Antarctic The Antarctic Kerguelen |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
unknown |
topic |
Life sciences medicine and health care competition niche width diet Otariid foraging ecology stable isotopes Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker pinniped Crozet Kerguelen Amsterdam envir geo |
spellingShingle |
Life sciences medicine and health care competition niche width diet Otariid foraging ecology stable isotopes Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker pinniped Crozet Kerguelen Amsterdam envir geo 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 competition niche width diet Otariid foraging ecology stable isotopes Arctocephalus tropicalis niche variation hypothesis Vibrissae Arctocephalus gazella Whisker pinniped Crozet Kerguelen Amsterdam envir geo |
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 |
Dataset |
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 |
https://doi.org/10.5061/dryad.k231g |
geographic |
Antarctic The Antarctic Kerguelen |
geographic_facet |
Antarctic The Antarctic Kerguelen |
genre |
Antarc* Antarctic Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Arctocephalus gazella |
op_source |
oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:88262 10.5061/dryad.k231g oai:easy.dans.knaw.nl:easy-dataset:88262 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 10|openaire____::081b82f96300b6a6e3d282bad31cb6e2 re3data_____::r3d100000044 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|opendoar____::8b6dd7db9af49e67306feb59a8bdc52c |
op_relation |
http://dx.doi.org/10.5061/dryad.k231g https://dx.doi.org/10.5061/dryad.k231g |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.k231g |
_version_ |
1766264809629679616 |