Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies
Using measurements of naturally occurring stable isotopes to reconstruct diets or source of feeding requires quantifying iso-topic discrimination factors or the relationships between iso-tope ratios in food and in consumer tissues. Diet-tissue dis-crimination factors of carbon (13C/12C, or d13C) and...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.508.2982 2023-05-15T18:03:51+02:00 Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies Yves Cherel Keith A. Hobson Sami Hassani The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.2982 http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.2982 http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf text 2005 ftciteseerx 2016-01-08T09:29:00Z Using measurements of naturally occurring stable isotopes to reconstruct diets or source of feeding requires quantifying iso-topic discrimination factors or the relationships between iso-tope ratios in food and in consumer tissues. Diet-tissue dis-crimination factors of carbon (13C/12C, or d13C) and nitrogen (15N/14N, or d15N) isotopes in whole blood and feathers, rep-resenting noninvasive sampling techniques, were examined us-ing three species of captive penguins (king Aptenodytes pata-gonicus, gentoo Pygoscelis papua, and rockhopper Eudyptes chrysocome penguins) fed known diets. King and rockhopper penguins raised on a constant diet of herring and capelin, re-spectively, had tissues enriched in 15N compared to fish, with discrimination factors being higher in feathers than in blood. These data, together with previous works, allowed us to cal-culate average discrimination factors for 15N between whole lipid-free prey and blood and feathers of piscivorous birds; they amount to 2.7 ‰ and 4.2‰, respectively. Both fish species were segregated by their d13C and d15N values, and importantly, lipid-free fish muscle tissue was consistently depleted in 13C and enriched in 15N compared to whole lipid-free fish. This finding has important implications because previous studies usually base dietary reconstructions on muscle of prey rather than on whole prey items consumed by the predator. We tested Text Pygoscelis papua Unknown |
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ftciteseerx |
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English |
description |
Using measurements of naturally occurring stable isotopes to reconstruct diets or source of feeding requires quantifying iso-topic discrimination factors or the relationships between iso-tope ratios in food and in consumer tissues. Diet-tissue dis-crimination factors of carbon (13C/12C, or d13C) and nitrogen (15N/14N, or d15N) isotopes in whole blood and feathers, rep-resenting noninvasive sampling techniques, were examined us-ing three species of captive penguins (king Aptenodytes pata-gonicus, gentoo Pygoscelis papua, and rockhopper Eudyptes chrysocome penguins) fed known diets. King and rockhopper penguins raised on a constant diet of herring and capelin, re-spectively, had tissues enriched in 15N compared to fish, with discrimination factors being higher in feathers than in blood. These data, together with previous works, allowed us to cal-culate average discrimination factors for 15N between whole lipid-free prey and blood and feathers of piscivorous birds; they amount to 2.7 ‰ and 4.2‰, respectively. Both fish species were segregated by their d13C and d15N values, and importantly, lipid-free fish muscle tissue was consistently depleted in 13C and enriched in 15N compared to whole lipid-free fish. This finding has important implications because previous studies usually base dietary reconstructions on muscle of prey rather than on whole prey items consumed by the predator. We tested |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Yves Cherel Keith A. Hobson Sami Hassani |
spellingShingle |
Yves Cherel Keith A. Hobson Sami Hassani Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
author_facet |
Yves Cherel Keith A. Hobson Sami Hassani |
author_sort |
Yves Cherel |
title |
Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
title_short |
Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
title_full |
Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
title_fullStr |
Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
title_full_unstemmed |
Isotopic discrimination between food and blood and feathers of captive penguins: Implications for dietary studies |
title_sort |
isotopic discrimination between food and blood and feathers of captive penguins: implications for dietary studies |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.2982 http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf |
genre |
Pygoscelis papua |
genre_facet |
Pygoscelis papua |
op_source |
http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.2982 http://www.cebc.cnrs.fr/publipdf/2005/CPBZ78.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766174879937200128 |