Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins
Abstract The use of stable isotopes of sulfur (δ34S) to infer avian diets, foraging habitats, and movements is relatively uncommon, resulting in a lack of information on patterns of δ34S incorporation in avian tissue. In a controlled study of Gentoo Penguins (Pygoscelis papua), we found that diet-ti...
Published in: | Ornithology |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/ornithology/ukad013 https://academic.oup.com/auk/advance-article-pdf/doi/10.1093/ornithology/ukad013/50297573/ukad013.pdf https://academic.oup.com/auk/article-pdf/140/3/ukad013/50877167/ukad013.pdf |
id |
croxfordunivpr:10.1093/ornithology/ukad013 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/ornithology/ukad013 2023-07-30T04:06:29+02:00 Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins Rosciano, Natalia G Stahl, Angela R Polito, Michael J Scientific Committee on Antarctic Research 2023 http://dx.doi.org/10.1093/ornithology/ukad013 https://academic.oup.com/auk/advance-article-pdf/doi/10.1093/ornithology/ukad013/50297573/ukad013.pdf https://academic.oup.com/auk/article-pdf/140/3/ukad013/50877167/ukad013.pdf en eng Oxford University Press (OUP) https://academic.oup.com/pages/standard-publication-reuse-rights Ornithology volume 140, issue 3 ISSN 0004-8038 2732-4613 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2023 croxfordunivpr https://doi.org/10.1093/ornithology/ukad013 2023-07-14T09:23:08Z Abstract The use of stable isotopes of sulfur (δ34S) to infer avian diets, foraging habitats, and movements is relatively uncommon, resulting in a lack of information on patterns of δ34S incorporation in avian tissue. In a controlled study of Gentoo Penguins (Pygoscelis papua), we found that diet-tissue isotopic discrimination factors (Δ34Sdiet-tissue) differed among egg components and feathers synthesized from a common diet, ranging from –0.4 to –1.7‰. We also found that methodical choices such as lipid extraction and prey tissue selection influenced calculated Δ34Sdiet-tissue values. Specifically, Δ34Sdiet-tissue values were lower (i.e., more negative) when calculated using whole fish relative to fish muscle and lipid-extraction biased egg yolk, but not fish tissue, δ34S values. The Δ34Sdiet-tissue values obtained for Gentoo Penguins fed a marine fish diet were generally lower than those reported for freshwater fish consumption by Double-crested Cormorants (Phalacrocorax auritus), the only other bird species in which Δ34Sdiet-tissue has been quantified. We found support for the hypothesis that tissue Δ34Sdiet-tissue values are inversely related to dietary δ34S values in birds, similar to what has been observed in mammals. Given this relationship, the discrimination factors reported here for Gentoo Penguins may be broadly applicable to other avian species with a similar marine diet. Finally, we provide recommendations for future studies seeking to quantify Δ34Sdiet-tissue in avian tissues and guidance to allow for greater application of sulfur stable isotope analysis in ornithological research. Article in Journal/Newspaper Pygoscelis papua Oxford University Press (via Crossref) Ornithology |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Rosciano, Natalia G Stahl, Angela R Polito, Michael J Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract The use of stable isotopes of sulfur (δ34S) to infer avian diets, foraging habitats, and movements is relatively uncommon, resulting in a lack of information on patterns of δ34S incorporation in avian tissue. In a controlled study of Gentoo Penguins (Pygoscelis papua), we found that diet-tissue isotopic discrimination factors (Δ34Sdiet-tissue) differed among egg components and feathers synthesized from a common diet, ranging from –0.4 to –1.7‰. We also found that methodical choices such as lipid extraction and prey tissue selection influenced calculated Δ34Sdiet-tissue values. Specifically, Δ34Sdiet-tissue values were lower (i.e., more negative) when calculated using whole fish relative to fish muscle and lipid-extraction biased egg yolk, but not fish tissue, δ34S values. The Δ34Sdiet-tissue values obtained for Gentoo Penguins fed a marine fish diet were generally lower than those reported for freshwater fish consumption by Double-crested Cormorants (Phalacrocorax auritus), the only other bird species in which Δ34Sdiet-tissue has been quantified. We found support for the hypothesis that tissue Δ34Sdiet-tissue values are inversely related to dietary δ34S values in birds, similar to what has been observed in mammals. Given this relationship, the discrimination factors reported here for Gentoo Penguins may be broadly applicable to other avian species with a similar marine diet. Finally, we provide recommendations for future studies seeking to quantify Δ34Sdiet-tissue in avian tissues and guidance to allow for greater application of sulfur stable isotope analysis in ornithological research. |
author2 |
Scientific Committee on Antarctic Research |
format |
Article in Journal/Newspaper |
author |
Rosciano, Natalia G Stahl, Angela R Polito, Michael J |
author_facet |
Rosciano, Natalia G Stahl, Angela R Polito, Michael J |
author_sort |
Rosciano, Natalia G |
title |
Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
title_short |
Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
title_full |
Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
title_fullStr |
Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
title_full_unstemmed |
Sulfur isotopic discrimination factors differ among avian tissues and diets: Insights from a case study in Gentoo Penguins |
title_sort |
sulfur isotopic discrimination factors differ among avian tissues and diets: insights from a case study in gentoo penguins |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/ornithology/ukad013 https://academic.oup.com/auk/advance-article-pdf/doi/10.1093/ornithology/ukad013/50297573/ukad013.pdf https://academic.oup.com/auk/article-pdf/140/3/ukad013/50877167/ukad013.pdf |
genre |
Pygoscelis papua |
genre_facet |
Pygoscelis papua |
op_source |
Ornithology volume 140, issue 3 ISSN 0004-8038 2732-4613 |
op_rights |
https://academic.oup.com/pages/standard-publication-reuse-rights |
op_doi |
https://doi.org/10.1093/ornithology/ukad013 |
container_title |
Ornithology |
_version_ |
1772819118873903104 |