Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins.
Stomach content analysis (SCA) and more recently stable isotope analysis (SIA) integrated with isotopic mixing models have become common methods for dietary studies and provide insight into the foraging ecology of seabirds. However, both methods have drawbacks and biases that may result in difficult...
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ftdoajarticles:oai:doaj.org/article:00f87c36382f427e8ba61551c468fcff 2023-05-15T13:46:49+02:00 Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. Michael J Polito Wayne Z Trivelpiece Nina J Karnovsky Elizabeth Ng William P Patterson Steven D Emslie 2011-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0026642 https://doaj.org/article/00f87c36382f427e8ba61551c468fcff EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3203888?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0026642 https://doaj.org/article/00f87c36382f427e8ba61551c468fcff PLoS ONE, Vol 6, Iss 10, p e26642 (2011) Medicine R Science Q article 2011 ftdoajarticles https://doi.org/10.1371/journal.pone.0026642 2022-12-30T22:42:03Z Stomach content analysis (SCA) and more recently stable isotope analysis (SIA) integrated with isotopic mixing models have become common methods for dietary studies and provide insight into the foraging ecology of seabirds. However, both methods have drawbacks and biases that may result in difficulties in quantifying inter-annual and species-specific differences in diets. We used these two methods to simultaneously quantify the chick-rearing diet of Chinstrap (Pygoscelis antarctica) and Gentoo (P. papua) penguins and highlight methods of integrating SCA data to increase accuracy of diet composition estimates using SIA. SCA biomass estimates were highly variable and underestimated the importance of soft-bodied prey such as fish. Two-source, isotopic mixing model predictions were less variable and identified inter-annual and species-specific differences in the relative amounts of fish and krill in penguin diets not readily apparent using SCA. In contrast, multi-source isotopic mixing models had difficulty estimating the dietary contribution of fish species occupying similar trophic levels without refinement using SCA-derived otolith data. Overall, our ability to track inter-annual and species-specific differences in penguin diets using SIA was enhanced by integrating SCA data to isotopic mixing modes in three ways: 1) selecting appropriate prey sources, 2) weighting combinations of isotopically similar prey in two-source mixing models and 3) refining predicted contributions of isotopically similar prey in multi-source models. Article in Journal/Newspaper Antarc* Antarctica Pygoscelis antarctica Directory of Open Access Journals: DOAJ Articles PLoS ONE 6 10 e26642 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Michael J Polito Wayne Z Trivelpiece Nina J Karnovsky Elizabeth Ng William P Patterson Steven D Emslie Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
topic_facet |
Medicine R Science Q |
description |
Stomach content analysis (SCA) and more recently stable isotope analysis (SIA) integrated with isotopic mixing models have become common methods for dietary studies and provide insight into the foraging ecology of seabirds. However, both methods have drawbacks and biases that may result in difficulties in quantifying inter-annual and species-specific differences in diets. We used these two methods to simultaneously quantify the chick-rearing diet of Chinstrap (Pygoscelis antarctica) and Gentoo (P. papua) penguins and highlight methods of integrating SCA data to increase accuracy of diet composition estimates using SIA. SCA biomass estimates were highly variable and underestimated the importance of soft-bodied prey such as fish. Two-source, isotopic mixing model predictions were less variable and identified inter-annual and species-specific differences in the relative amounts of fish and krill in penguin diets not readily apparent using SCA. In contrast, multi-source isotopic mixing models had difficulty estimating the dietary contribution of fish species occupying similar trophic levels without refinement using SCA-derived otolith data. Overall, our ability to track inter-annual and species-specific differences in penguin diets using SIA was enhanced by integrating SCA data to isotopic mixing modes in three ways: 1) selecting appropriate prey sources, 2) weighting combinations of isotopically similar prey in two-source mixing models and 3) refining predicted contributions of isotopically similar prey in multi-source models. |
format |
Article in Journal/Newspaper |
author |
Michael J Polito Wayne Z Trivelpiece Nina J Karnovsky Elizabeth Ng William P Patterson Steven D Emslie |
author_facet |
Michael J Polito Wayne Z Trivelpiece Nina J Karnovsky Elizabeth Ng William P Patterson Steven D Emslie |
author_sort |
Michael J Polito |
title |
Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
title_short |
Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
title_full |
Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
title_fullStr |
Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
title_full_unstemmed |
Integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
title_sort |
integrating stomach content and stable isotope analyses to quantify the diets of pygoscelid penguins. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2011 |
url |
https://doi.org/10.1371/journal.pone.0026642 https://doaj.org/article/00f87c36382f427e8ba61551c468fcff |
genre |
Antarc* Antarctica Pygoscelis antarctica |
genre_facet |
Antarc* Antarctica Pygoscelis antarctica |
op_source |
PLoS ONE, Vol 6, Iss 10, p e26642 (2011) |
op_relation |
http://europepmc.org/articles/PMC3203888?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0026642 https://doaj.org/article/00f87c36382f427e8ba61551c468fcff |
op_doi |
https://doi.org/10.1371/journal.pone.0026642 |
container_title |
PLoS ONE |
container_volume |
6 |
container_issue |
10 |
container_start_page |
e26642 |
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