Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean
International audience The food and feeding ecology of the 2 closely related species of prions Pachyptila belcheri and P. desolata was investigated over 3 consecutive chick-rearing periods at Iles Kerguelen, the only place where they nest sympatrically in large numbers. In all years, the 2 prion spe...
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ftunivnantes:oai:HAL:hal-00191905v1 2023-05-15T14:03:19+02:00 Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean Cherel, Yves Bocher, Pierrick de Broyer, Claude Hobson, Keith A. Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés (CRELA) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Département des Invertébrés Institut Royal des Sciences Naturelles de Belgique (IRSNB) Prairie and Northern Wildlife Research Centre Environment and Climate Change Canada 2002 https://hal.science/hal-00191905 en eng HAL CCSD Inter Research hal-00191905 https://hal.science/hal-00191905 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00191905 Marine Ecology Progress Series, 2002, 228, pp.263-281 Euphausia superba Pachyptila Petrels Seabirds Trophic relationships Stablecarbon isotopes Stable-nitrogen isotopes Themisto gaudichaudii [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2002 ftunivnantes 2023-03-08T05:58:23Z International audience The food and feeding ecology of the 2 closely related species of prions Pachyptila belcheri and P. desolata was investigated over 3 consecutive chick-rearing periods at Iles Kerguelen, the only place where they nest sympatrically in large numbers. In all years, the 2 prion species fed on crustaceans, with a small proportion of mesopelagic fish and squid. The hyperiid amphipod Themisto gaudichaudii was consistently the dominant prey item, accounting for 76 and 70% by number, and 57 and 57% by reconstituted mass of the diet of P. belcheri and P. desolata, respectively. Prions, however, were segregated by feeding on different euphausiids, P. belcheri on Thysanoessa sp. (18% by number and 16% by mass) and P. desolata on Euphausia vallentini (9% by number and 15% by mass). P. desolata also caught more small prey such as copepods (9 vs <1% by number) and cypris larvae of Lepas australis (8 vs 3% by number) than P. belcheri, which can be related to the beak filtering apparatus present only in the former species. Biogeography of the prey and their state of digestion indicate that prions foraged in a wide variety of marine habitats, including the kelp belt, kelp rafts, and coastal, neritic and oceanic waters. Noticeable is the occurrence of E. superba in a significant number of food samples (15 and 10% for P. belcheri and P. desolata, respectively), suggesting feeding in distant foraging grounds in southern Antarctic waters, >1000 km from the breeding colonies, during the chick-rearing period. The stable-carbon and -nitrogen isotopic compositions of chick feathers were identical in both species, indicating no important trophic segregation during the breeding period, when adult birds are central-place foragers. The ratios were, however, different in adult feathers, suggesting moulting in Antarctic waters for P. belcheri and in subtropical waters for P. desolata, i.e. in distinct foraging areas when birds are not constrained to return to the colonies. Article in Journal/Newspaper Antarc* Antarctic Euphausia superba Copepods Université de Nantes: HAL-UNIV-NANTES Antarctic Kerguelen Indian The Beak ENVELOPE(-130.771,-130.771,56.466,56.466) |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Euphausia superba Pachyptila Petrels Seabirds Trophic relationships Stablecarbon isotopes Stable-nitrogen isotopes Themisto gaudichaudii [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Euphausia superba Pachyptila Petrels Seabirds Trophic relationships Stablecarbon isotopes Stable-nitrogen isotopes Themisto gaudichaudii [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes Cherel, Yves Bocher, Pierrick de Broyer, Claude Hobson, Keith A. Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
topic_facet |
Euphausia superba Pachyptila Petrels Seabirds Trophic relationships Stablecarbon isotopes Stable-nitrogen isotopes Themisto gaudichaudii [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The food and feeding ecology of the 2 closely related species of prions Pachyptila belcheri and P. desolata was investigated over 3 consecutive chick-rearing periods at Iles Kerguelen, the only place where they nest sympatrically in large numbers. In all years, the 2 prion species fed on crustaceans, with a small proportion of mesopelagic fish and squid. The hyperiid amphipod Themisto gaudichaudii was consistently the dominant prey item, accounting for 76 and 70% by number, and 57 and 57% by reconstituted mass of the diet of P. belcheri and P. desolata, respectively. Prions, however, were segregated by feeding on different euphausiids, P. belcheri on Thysanoessa sp. (18% by number and 16% by mass) and P. desolata on Euphausia vallentini (9% by number and 15% by mass). P. desolata also caught more small prey such as copepods (9 vs <1% by number) and cypris larvae of Lepas australis (8 vs 3% by number) than P. belcheri, which can be related to the beak filtering apparatus present only in the former species. Biogeography of the prey and their state of digestion indicate that prions foraged in a wide variety of marine habitats, including the kelp belt, kelp rafts, and coastal, neritic and oceanic waters. Noticeable is the occurrence of E. superba in a significant number of food samples (15 and 10% for P. belcheri and P. desolata, respectively), suggesting feeding in distant foraging grounds in southern Antarctic waters, >1000 km from the breeding colonies, during the chick-rearing period. The stable-carbon and -nitrogen isotopic compositions of chick feathers were identical in both species, indicating no important trophic segregation during the breeding period, when adult birds are central-place foragers. The ratios were, however, different in adult feathers, suggesting moulting in Antarctic waters for P. belcheri and in subtropical waters for P. desolata, i.e. in distinct foraging areas when birds are not constrained to return to the colonies. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés (CRELA) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Département des Invertébrés Institut Royal des Sciences Naturelles de Belgique (IRSNB) Prairie and Northern Wildlife Research Centre Environment and Climate Change Canada |
format |
Article in Journal/Newspaper |
author |
Cherel, Yves Bocher, Pierrick de Broyer, Claude Hobson, Keith A. |
author_facet |
Cherel, Yves Bocher, Pierrick de Broyer, Claude Hobson, Keith A. |
author_sort |
Cherel, Yves |
title |
Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
title_short |
Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
title_full |
Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
title_fullStr |
Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
title_full_unstemmed |
Food and feeding ecology of the sympatric thinbilled Pachyptila belcheri and Antarctic P. desolata prions at Iles Kerguelen, Southern Indian Ocean |
title_sort |
food and feeding ecology of the sympatric thinbilled pachyptila belcheri and antarctic p. desolata prions at iles kerguelen, southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00191905 |
long_lat |
ENVELOPE(-130.771,-130.771,56.466,56.466) |
geographic |
Antarctic Kerguelen Indian The Beak |
geographic_facet |
Antarctic Kerguelen Indian The Beak |
genre |
Antarc* Antarctic Euphausia superba Copepods |
genre_facet |
Antarc* Antarctic Euphausia superba Copepods |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00191905 Marine Ecology Progress Series, 2002, 228, pp.263-281 |
op_relation |
hal-00191905 https://hal.science/hal-00191905 |
_version_ |
1766273943491051520 |