Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica
International audience The emperor and Adélie penguins are the only two species of penguins that co-occur at high-Antarctic latitudes. We Wrst measured and compared their isotopic niches on the same year in Adélie Land in spring, when the two species co-exist. Emperor and Adélie penguins segregated...
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fttriple:oai:gotriple.eu:10670/1.wts0kh 2023-05-15T13:43:38+02:00 Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica Cherel, Yves Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2008-06-09 https://doi.org/10.1007/s00227-008-0974-3 https://hal.archives-ouvertes.fr/hal-00286305 en eng HAL CCSD Springer Verlag hal-00286305 doi:10.1007/s00227-008-0974-3 10670/1.wts0kh https://hal.archives-ouvertes.fr/hal-00286305 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology Marine Biology, Springer Verlag, 2008, 154, pp.813-821. ⟨10.1007/s00227-008-0974-3⟩ geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2008 fttriple https://doi.org/10.1007/s00227-008-0974-3 2023-01-22T16:50:26Z International audience The emperor and Adélie penguins are the only two species of penguins that co-occur at high-Antarctic latitudes. We Wrst measured and compared their isotopic niches on the same year in Adélie Land in spring, when the two species co-exist. Emperor and Adélie penguins segregated by their blood isotopic signatures, with adult 13C values (¡24.5 § 0.2 and ¡25.4 § 0.2‰, respectively) suggesting that emperor penguins foraged in more neritic waters than Adélie penguins in spring. At that time, diVerence in their 15N values (4.1‰, 12.0 § 0.4 vs. 7.9 § 0.1‰) encompassed more than one trophic level, indicating that emperor penguins preyed mainly upon Wsh (and squids), while Adélie penguins fed exclusively on euphausiids. Second, we compared the food of breeding adults and chicks. The isotopic signatures of adults and chicks of emperor penguins were not statistically diVerent, but 15N value of Adélie penguin chicks was higher than that of adults (10.2 § 0.8 vs. 9.0 § 0.2‰). The diVerence showed that adult Adélie penguins captured higher trophic level prey, i.e. higher-quality food, for their chicks. Third, the isotopic signatures of Adélie penguins breeding in Adélie Land showed that adults fed on Antarctic krill in oceanic waters in spring and shifted to neritic waters in summer where they preyed upon ice krill for themselves and upon Wsh and euphausiids for their chicks. A comparison of isotopic niches revealed large overlaps in both blood 13C and 15N values within the community of Antarctic seabirds and pinnipeds. The continuum in 15N values nevertheless encompassed more than one trophic level (5.2‰) from Adélie penguin and crabeater seal to the Weddell seal. Such a broad continuum emphasizes the fact that all Antarctic seabirds and marine mammals feed on varying proportions of a few crustacean (euphausiids) and Wsh (Antarctic silver-Wsh) species that dominate the intermediate trophic levels of the pelagic neritic and oceanic ecosystems. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seal Emperor penguins Weddell Seal Unknown Antarctic Weddell Marine Biology 154 5 813 821 |
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English |
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geo envir Cherel, Yves Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
topic_facet |
geo envir |
description |
International audience The emperor and Adélie penguins are the only two species of penguins that co-occur at high-Antarctic latitudes. We Wrst measured and compared their isotopic niches on the same year in Adélie Land in spring, when the two species co-exist. Emperor and Adélie penguins segregated by their blood isotopic signatures, with adult 13C values (¡24.5 § 0.2 and ¡25.4 § 0.2‰, respectively) suggesting that emperor penguins foraged in more neritic waters than Adélie penguins in spring. At that time, diVerence in their 15N values (4.1‰, 12.0 § 0.4 vs. 7.9 § 0.1‰) encompassed more than one trophic level, indicating that emperor penguins preyed mainly upon Wsh (and squids), while Adélie penguins fed exclusively on euphausiids. Second, we compared the food of breeding adults and chicks. The isotopic signatures of adults and chicks of emperor penguins were not statistically diVerent, but 15N value of Adélie penguin chicks was higher than that of adults (10.2 § 0.8 vs. 9.0 § 0.2‰). The diVerence showed that adult Adélie penguins captured higher trophic level prey, i.e. higher-quality food, for their chicks. Third, the isotopic signatures of Adélie penguins breeding in Adélie Land showed that adults fed on Antarctic krill in oceanic waters in spring and shifted to neritic waters in summer where they preyed upon ice krill for themselves and upon Wsh and euphausiids for their chicks. A comparison of isotopic niches revealed large overlaps in both blood 13C and 15N values within the community of Antarctic seabirds and pinnipeds. The continuum in 15N values nevertheless encompassed more than one trophic level (5.2‰) from Adélie penguin and crabeater seal to the Weddell seal. Such a broad continuum emphasizes the fact that all Antarctic seabirds and marine mammals feed on varying proportions of a few crustacean (euphausiids) and Wsh (Antarctic silver-Wsh) species that dominate the intermediate trophic levels of the pelagic neritic and oceanic ecosystems. |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cherel, Yves |
author_facet |
Cherel, Yves |
author_sort |
Cherel, Yves |
title |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
title_short |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
title_full |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
title_fullStr |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
title_full_unstemmed |
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica |
title_sort |
isotopic niches of emperor and adélie penguins in adélie land, antarctica |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://doi.org/10.1007/s00227-008-0974-3 https://hal.archives-ouvertes.fr/hal-00286305 |
geographic |
Antarctic Weddell |
geographic_facet |
Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seal Emperor penguins Weddell Seal |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seal Emperor penguins Weddell Seal |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology Marine Biology, Springer Verlag, 2008, 154, pp.813-821. ⟨10.1007/s00227-008-0974-3⟩ |
op_relation |
hal-00286305 doi:10.1007/s00227-008-0974-3 10670/1.wts0kh https://hal.archives-ouvertes.fr/hal-00286305 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1007/s00227-008-0974-3 |
container_title |
Marine Biology |
container_volume |
154 |
container_issue |
5 |
container_start_page |
813 |
op_container_end_page |
821 |
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1766191455799345152 |