Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel)
International audience Sympatric harbour (Phoca vitulina) and grey seals (Halichoerus grypus) are increasinglyconsidered potential competitors, especially since recent local declines in harbourseal numbers while grey seal numbers remained stable or increased at their Europeancore distributions. A be...
Published in: | Ecology and Evolution |
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2021
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Online Access: | https://hal.archives-ouvertes.fr/hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817/document https://hal.archives-ouvertes.fr/hal-03108817/file/PEE11_2021.pdf https://doi.org/10.1002/ece3.7739 |
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ftccsdartic:oai:HAL:hal-03108817v1 2023-05-15T16:33:39+02:00 Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) Planque, Yann Spitz, Jérôme Authier, Matthieu Vincent, Cécile Caurant, Florence Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Observatoire PELAGIS UMS 3462 (PELAGIS) LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) 2021 https://hal.archives-ouvertes.fr/hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817/document https://hal.archives-ouvertes.fr/hal-03108817/file/PEE11_2021.pdf https://doi.org/10.1002/ece3.7739 en eng HAL CCSD Wiley Open Access info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.7739 hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817/document https://hal.archives-ouvertes.fr/hal-03108817/file/PEE11_2021.pdf doi:10.1002/ece3.7739 info:eu-repo/semantics/OpenAccess ISSN: 2045-7758 Ecology and Evolution https://hal.archives-ouvertes.fr/hal-03108817 Ecology and Evolution, Wiley Open Access, 2021, 11 (15), pp.10004-10025. ⟨10.1002/ece3.7739⟩ marine top predators stableisotopes diet content feeding strategies pinnipeds Foraging ecology [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1002/ece3.7739 2021-11-06T23:23:36Z International audience Sympatric harbour (Phoca vitulina) and grey seals (Halichoerus grypus) are increasinglyconsidered potential competitors, especially since recent local declines in harbourseal numbers while grey seal numbers remained stable or increased at their Europeancore distributions. A better understanding of the interactions between these speciesis critical for conservation efforts. This study aimed to identify the trophic nicheoverlap between harbour and grey seals at the southern limit of their Europeanrange, in the Baie de Somme (BDS, Eastern English Channel, France), where numbersof resident harbour seals and visiting grey seals are increasing exponentially. Dietaryoverlap was identified from scat contents using hierarchical clustering. Isotopic nicheoverlap was quantified using δ13C and δ15N isotopic values from whiskers of 18 individuals,by estimating isotopic standard ellipses with a novel hierarchical modeldeveloped in a Bayesian framework to consider both intraindividual variability andinterindividual variability. Foraging areas of these individuals were identified fromtelemetry data. The three independent approaches provided converging results, revealinga high trophic niche overlap due to consumption of benthic flatfish. Two dietclusters were dominated by either small or large benthic flatfish; these comprised85.5% [CI95%: 80.3%–90.2%]of harbour seal scats and 46.8% [35.1%–58.4%]of greyseal scats. The narrower isotopic niche of harbour seals was nested within that ofgrey seals (58.2% [22.7%–100%]overlap). Grey seals with isotopic values similar toharbour seals foraged in coastal waters close to the BDS alike harbour seals did, suggestingthe niche overlap may be due to individual grey seal strategies. Our findingstherefore provide the basis for potential competition between both species (foragingon benthic flatfish close to the BDS). We suggest that a continued increase in sealnumbers and/or a decrease in flatfish supply in this area could cause/amplify competitiveinteractions and have ... Article in Journal/Newspaper harbour seal Phoca vitulina Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Ecology and Evolution 11 15 10004 10025 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
marine top predators stableisotopes diet content feeding strategies pinnipeds Foraging ecology [SDE]Environmental Sciences |
spellingShingle |
marine top predators stableisotopes diet content feeding strategies pinnipeds Foraging ecology [SDE]Environmental Sciences Planque, Yann Spitz, Jérôme Authier, Matthieu Vincent, Cécile Caurant, Florence Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
topic_facet |
marine top predators stableisotopes diet content feeding strategies pinnipeds Foraging ecology [SDE]Environmental Sciences |
description |
International audience Sympatric harbour (Phoca vitulina) and grey seals (Halichoerus grypus) are increasinglyconsidered potential competitors, especially since recent local declines in harbourseal numbers while grey seal numbers remained stable or increased at their Europeancore distributions. A better understanding of the interactions between these speciesis critical for conservation efforts. This study aimed to identify the trophic nicheoverlap between harbour and grey seals at the southern limit of their Europeanrange, in the Baie de Somme (BDS, Eastern English Channel, France), where numbersof resident harbour seals and visiting grey seals are increasing exponentially. Dietaryoverlap was identified from scat contents using hierarchical clustering. Isotopic nicheoverlap was quantified using δ13C and δ15N isotopic values from whiskers of 18 individuals,by estimating isotopic standard ellipses with a novel hierarchical modeldeveloped in a Bayesian framework to consider both intraindividual variability andinterindividual variability. Foraging areas of these individuals were identified fromtelemetry data. The three independent approaches provided converging results, revealinga high trophic niche overlap due to consumption of benthic flatfish. Two dietclusters were dominated by either small or large benthic flatfish; these comprised85.5% [CI95%: 80.3%–90.2%]of harbour seal scats and 46.8% [35.1%–58.4%]of greyseal scats. The narrower isotopic niche of harbour seals was nested within that ofgrey seals (58.2% [22.7%–100%]overlap). Grey seals with isotopic values similar toharbour seals foraged in coastal waters close to the BDS alike harbour seals did, suggestingthe niche overlap may be due to individual grey seal strategies. Our findingstherefore provide the basis for potential competition between both species (foragingon benthic flatfish close to the BDS). We suggest that a continued increase in sealnumbers and/or a decrease in flatfish supply in this area could cause/amplify competitiveinteractions and have ... |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Observatoire PELAGIS UMS 3462 (PELAGIS) LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Planque, Yann Spitz, Jérôme Authier, Matthieu Vincent, Cécile Caurant, Florence |
author_facet |
Planque, Yann Spitz, Jérôme Authier, Matthieu Vincent, Cécile Caurant, Florence |
author_sort |
Planque, Yann |
title |
Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
title_short |
Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
title_full |
Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
title_fullStr |
Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
title_full_unstemmed |
Trophic niche overlap between sympatric harbour seals(Phoca vitulina) and grey seals (Halichoerus grypus) at thesouthern limit of their European range (Eastern EnglishChannel) |
title_sort |
trophic niche overlap between sympatric harbour seals(phoca vitulina) and grey seals (halichoerus grypus) at thesouthern limit of their european range (eastern englishchannel) |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817/document https://hal.archives-ouvertes.fr/hal-03108817/file/PEE11_2021.pdf https://doi.org/10.1002/ece3.7739 |
genre |
harbour seal Phoca vitulina |
genre_facet |
harbour seal Phoca vitulina |
op_source |
ISSN: 2045-7758 Ecology and Evolution https://hal.archives-ouvertes.fr/hal-03108817 Ecology and Evolution, Wiley Open Access, 2021, 11 (15), pp.10004-10025. ⟨10.1002/ece3.7739⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.7739 hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817 https://hal.archives-ouvertes.fr/hal-03108817/document https://hal.archives-ouvertes.fr/hal-03108817/file/PEE11_2021.pdf doi:10.1002/ece3.7739 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/ece3.7739 |
container_title |
Ecology and Evolution |
container_volume |
11 |
container_issue |
15 |
container_start_page |
10004 |
op_container_end_page |
10025 |
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1766023344719659008 |