Integrating stomach content and stable isotope analyses to quantify the diets of Pygoscelid penguins
Abstract 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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1051.9073 2023-05-15T13:41:28+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 The Pennsylvania State University CiteSeerX Archives 2011 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1051.9073 http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1051.9073 http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf text 2011 ftciteseerx 2020-04-12T00:15:25Z Abstract 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 softbodied 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. Text Antarc* Antarctica Pygoscelis antarctica Unknown |
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Abstract 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 softbodied 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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael J Polito Wayne Z Trivelpiece Nina J Karnovsky Elizabeth Ng William P Patterson Steven D Emslie |
spellingShingle |
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 |
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 |
publishDate |
2011 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1051.9073 http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf |
genre |
Antarc* Antarctica Pygoscelis antarctica |
genre_facet |
Antarc* Antarctica Pygoscelis antarctica |
op_source |
http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1051.9073 http://people.uncw.edu/emslies/documents/Politoetal.2011penguinstomachcontent.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766151118116618240 |