Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds
International audience Seabirds are mostly thought to moult during the inter-breeding period and the isotopicvalues of their feathers are often therefore assumed to relate to their assimilated diet duringsuch periods. We observed Brown Skuas Stercorarius antarcticus lonnbergi and SouthPolar Skuas St...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01500534 https://doi.org/10.1111/ibi.12441 |
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ftccsdartic:oai:HAL:hal-01500534v1 2023-05-15T13:51:41+02:00 Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds GRANA, GRILLI Cherel, Yves Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente Bariloche (INIBIOMA-CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Universidad Nacional del Comahue Neuquén (UNCOMA) 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) 2017 https://hal.archives-ouvertes.fr/hal-01500534 https://doi.org/10.1111/ibi.12441 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/ibi.12441 hal-01500534 https://hal.archives-ouvertes.fr/hal-01500534 doi:10.1111/ibi.12441 ISSN: 0019-1019 EISSN: 1474-919X Ibis https://hal.archives-ouvertes.fr/hal-01500534 Ibis, Wiley, 2017, 159, pp.266-271. ⟨10.1111/ibi.12441⟩ diet migration Southern Ocean Antarctica [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.1111/ibi.12441 2021-11-07T03:56:23Z International audience Seabirds are mostly thought to moult during the inter-breeding period and the isotopicvalues of their feathers are often therefore assumed to relate to their assimilated diet duringsuch periods. We observed Brown Skuas Stercorarius antarcticus lonnbergi and SouthPolar Skuas Stercorarius maccormicki moulting on a breeding site at King George Island,Antarctica. This raises concerns about the reliability of using stable isotopes in feathersto infer feeding localities of birds during the inter-breeding period. We analysed thed13C and d15N values of growing and fully grown body feathers collected from the sameindividuals. For both species, d13C values of growing feathers indicated feeding areas inthe Antarctic zone (breeding grounds), whereas most fully grown feathers (100% forSouth Polar Skuas and 93.3% for Brown Skuas) could be assigned to northern latitudes(non-breeding grounds). However, a few fully grown body feathers of Brown Skuas(6.7% of the feathers, belonging to two birds) showed isotopic values that indicatedmoult in the Antarctic zone. As the growth period of those feathers was unknown, theycould not be used with confidence to depict the foraging behaviour of the birds duringthe non-breeding period. Although precautions must be taken when inferring dietaryinformation from feathers in seabirds where the moulting pattern is unknown, this studyshows that if the development stage of a feather (growing/fully grown) is identified, thendietary information from both breeding and non-breeding seasons can be obtained onthe same individual birds. Article in Journal/Newspaper Antarc* Antarctic Antarctica antarcticus King George Island Southern Ocean Stercorarius antarcticus Stercorarius maccormicki Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic King George Island Southern Ocean The Antarctic Ibis 159 2 266 271 |
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 |
diet migration Southern Ocean Antarctica [SDE]Environmental Sciences |
spellingShingle |
diet migration Southern Ocean Antarctica [SDE]Environmental Sciences GRANA, GRILLI Cherel, Yves Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
topic_facet |
diet migration Southern Ocean Antarctica [SDE]Environmental Sciences |
description |
International audience Seabirds are mostly thought to moult during the inter-breeding period and the isotopicvalues of their feathers are often therefore assumed to relate to their assimilated diet duringsuch periods. We observed Brown Skuas Stercorarius antarcticus lonnbergi and SouthPolar Skuas Stercorarius maccormicki moulting on a breeding site at King George Island,Antarctica. This raises concerns about the reliability of using stable isotopes in feathersto infer feeding localities of birds during the inter-breeding period. We analysed thed13C and d15N values of growing and fully grown body feathers collected from the sameindividuals. For both species, d13C values of growing feathers indicated feeding areas inthe Antarctic zone (breeding grounds), whereas most fully grown feathers (100% forSouth Polar Skuas and 93.3% for Brown Skuas) could be assigned to northern latitudes(non-breeding grounds). However, a few fully grown body feathers of Brown Skuas(6.7% of the feathers, belonging to two birds) showed isotopic values that indicatedmoult in the Antarctic zone. As the growth period of those feathers was unknown, theycould not be used with confidence to depict the foraging behaviour of the birds duringthe non-breeding period. Although precautions must be taken when inferring dietaryinformation from feathers in seabirds where the moulting pattern is unknown, this studyshows that if the development stage of a feather (growing/fully grown) is identified, thendietary information from both breeding and non-breeding seasons can be obtained onthe same individual birds. |
author2 |
Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente Bariloche (INIBIOMA-CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Universidad Nacional del Comahue Neuquén (UNCOMA) 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) |
format |
Article in Journal/Newspaper |
author |
GRANA, GRILLI Cherel, Yves |
author_facet |
GRANA, GRILLI Cherel, Yves |
author_sort |
GRANA, GRILLI |
title |
Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
title_short |
Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
title_full |
Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
title_fullStr |
Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
title_full_unstemmed |
Skuas (Stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
title_sort |
skuas (stercorarius spp.) moult body feathers during both the breeding and inter-breeding periods: implications for stable isotope investigations in seabirds |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-01500534 https://doi.org/10.1111/ibi.12441 |
geographic |
Antarctic King George Island Southern Ocean The Antarctic |
geographic_facet |
Antarctic King George Island Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica antarcticus King George Island Southern Ocean Stercorarius antarcticus Stercorarius maccormicki |
genre_facet |
Antarc* Antarctic Antarctica antarcticus King George Island Southern Ocean Stercorarius antarcticus Stercorarius maccormicki |
op_source |
ISSN: 0019-1019 EISSN: 1474-919X Ibis https://hal.archives-ouvertes.fr/hal-01500534 Ibis, Wiley, 2017, 159, pp.266-271. ⟨10.1111/ibi.12441⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/ibi.12441 hal-01500534 https://hal.archives-ouvertes.fr/hal-01500534 doi:10.1111/ibi.12441 |
op_doi |
https://doi.org/10.1111/ibi.12441 |
container_title |
Ibis |
container_volume |
159 |
container_issue |
2 |
container_start_page |
266 |
op_container_end_page |
271 |
_version_ |
1766255703462248448 |