Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas
International audience Changes in seasonal resource availability and in energetic requirements as offspring grow may force parents to change their trophic ecology throughout the breeding season. Brown skuas Stercorarius antarcticus breed in a highly seasonal environment where the availability of the...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
|
Subjects: | |
Online Access: | https://hal.science/hal-04051906 https://doi.org/10.3354/meps14277 |
id |
ftccsdartic:oai:HAL:hal-04051906v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-04051906v1 2024-02-27T08:35:12+00:00 Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas Graña Grilli, M Di Virgilio, A Alarcón, Pae Cherel, Y 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) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2023-03-23 https://hal.science/hal-04051906 https://doi.org/10.3354/meps14277 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps14277 hal-04051906 https://hal.science/hal-04051906 doi:10.3354/meps14277 WOS: 000989709200008 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-04051906 Marine Ecology Progress Series, 2023, 708, pp.163-176. ⟨10.3354/meps14277⟩ Antarctica Isotopic analysis Movement South Shetland Islands Stercorarius antarcticus Trophic ecology [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.3354/meps14277 2024-01-28T00:50:11Z International audience Changes in seasonal resource availability and in energetic requirements as offspring grow may force parents to change their trophic ecology throughout the breeding season. Brown skuas Stercorarius antarcticus breed in a highly seasonal environment where the availability of their main food resource changes during the season. We studied the feeding plasticity of breeding brown skuas by assessing their isotopic diet and movement patterns at different stages of their breeding cycle. Blood δ 15 N values indicated that penguin chicks Pygoscelis spp. and Antarctic krill Euphausia superba constituted most of the diet of brown skuas (up to ~70%), and that there was an increase in the ingestion of lower trophic level prey (most likely Antarctic krill ) throughout the breeding period (from 30-46%). This contrasts with movement analysis indicating that 65% of the overall foraging locations were within penguin rookeries. The apparent contradiction between the results from both techniques may be explained by a combination of some skuas feeding mostly at sea or on shore together with secondary ingestion of marine resources from the penguins’ gut by feeding mostly within penguin rookeries. Krill obtained in that way may provide protein to replenish reserves before migration along with globulins through the intake of carotenoids. These results highlight the fact that the trophic ecology of species can be more complex than that suggested by one single method and emphasizes the importance of combining techniques to draw robust conclusions. In addition, our study indicates that skuas may select portions of prey to obtain specific resources to fulfill their nutritional requirements. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba South Shetland Islands Stercorarius antarcticus Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic South Shetland Islands Marine Ecology Progress Series 708 163 176 |
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 |
Antarctica Isotopic analysis Movement South Shetland Islands Stercorarius antarcticus Trophic ecology [SDE]Environmental Sciences |
spellingShingle |
Antarctica Isotopic analysis Movement South Shetland Islands Stercorarius antarcticus Trophic ecology [SDE]Environmental Sciences Graña Grilli, M Di Virgilio, A Alarcón, Pae Cherel, Y Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
topic_facet |
Antarctica Isotopic analysis Movement South Shetland Islands Stercorarius antarcticus Trophic ecology [SDE]Environmental Sciences |
description |
International audience Changes in seasonal resource availability and in energetic requirements as offspring grow may force parents to change their trophic ecology throughout the breeding season. Brown skuas Stercorarius antarcticus breed in a highly seasonal environment where the availability of their main food resource changes during the season. We studied the feeding plasticity of breeding brown skuas by assessing their isotopic diet and movement patterns at different stages of their breeding cycle. Blood δ 15 N values indicated that penguin chicks Pygoscelis spp. and Antarctic krill Euphausia superba constituted most of the diet of brown skuas (up to ~70%), and that there was an increase in the ingestion of lower trophic level prey (most likely Antarctic krill ) throughout the breeding period (from 30-46%). This contrasts with movement analysis indicating that 65% of the overall foraging locations were within penguin rookeries. The apparent contradiction between the results from both techniques may be explained by a combination of some skuas feeding mostly at sea or on shore together with secondary ingestion of marine resources from the penguins’ gut by feeding mostly within penguin rookeries. Krill obtained in that way may provide protein to replenish reserves before migration along with globulins through the intake of carotenoids. These results highlight the fact that the trophic ecology of species can be more complex than that suggested by one single method and emphasizes the importance of combining techniques to draw robust conclusions. In addition, our study indicates that skuas may select portions of prey to obtain specific resources to fulfill their nutritional requirements. |
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) La Rochelle Université (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 |
Graña Grilli, M Di Virgilio, A Alarcón, Pae Cherel, Y |
author_facet |
Graña Grilli, M Di Virgilio, A Alarcón, Pae Cherel, Y |
author_sort |
Graña Grilli, M |
title |
Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
title_short |
Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
title_full |
Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
title_fullStr |
Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
title_full_unstemmed |
Apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of Antarctic krill in brown skuas |
title_sort |
apparent mismatch between stable isotopes and foraging habitat suggests high secondary ingestion of antarctic krill in brown skuas |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04051906 https://doi.org/10.3354/meps14277 |
geographic |
Antarctic South Shetland Islands |
geographic_facet |
Antarctic South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba South Shetland Islands Stercorarius antarcticus |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba South Shetland Islands Stercorarius antarcticus |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-04051906 Marine Ecology Progress Series, 2023, 708, pp.163-176. ⟨10.3354/meps14277⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps14277 hal-04051906 https://hal.science/hal-04051906 doi:10.3354/meps14277 WOS: 000989709200008 |
op_doi |
https://doi.org/10.3354/meps14277 |
container_title |
Marine Ecology Progress Series |
container_volume |
708 |
container_start_page |
163 |
op_container_end_page |
176 |
_version_ |
1792041656845860864 |