Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry
Abstract Penguins are a monophyletic group in which many species are found breeding sympatrically, raising questions regarding how these species coexist successfully. Here, the isotopic niche of three sympatric pygoscelid penguin species was investigated at Powell Island, South Orkney Islands, durin...
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crwiley:10.1002/ece3.3937 2024-06-02T07:57:53+00:00 Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry Tarroux, Arnaud Lydersen, Christian Trathan, Philip N. Kovacs, Kit M. Norges Forskningsråd 2018 http://dx.doi.org/10.1002/ece3.3937 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.3937 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.3937 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 8, issue 7, page 3660-3674 ISSN 2045-7758 2045-7758 journal-article 2018 crwiley https://doi.org/10.1002/ece3.3937 2024-05-03T12:00:35Z Abstract Penguins are a monophyletic group in which many species are found breeding sympatrically, raising questions regarding how these species coexist successfully. Here, the isotopic niche of three sympatric pygoscelid penguin species was investigated at Powell Island, South Orkney Islands, during two breeding seasons (austral summers 2013–2014 and 2015–2016). Measurements of carbon (δ 13 C) and nitrogen (δ 15 N) stable isotope ratios were obtained from blood (adults) or feather (chicks) samples collected from Adélie Pygoscelis adeliae , chinstrap P. antarctica , and gentoo P. papua penguins. Isotopic niche regions (a proxy for the realized trophic niches) were computed to provide estimates of the trophic niche width of the studied species during the breeding season. The isotopic niche regions of adults of all three species were similar, but gentoo chicks had noticeably wider isotopic niches than the chicks of the other two species. Moderate to strong overlap in isotopic niche among species was found during each breeding season and for both age groups, suggesting that the potential for competition for shared food sources was similar during the two study years, although the actual level of competition could not be determined owing to the lack of data on resource abundance. Clear interannual shifts in isotopic niche were seen in all three species, though of lower amplitude for adult chinstrap penguins. These shifts were due to variation in carbon, but not nitrogen, isotopic ratios, which could indicate either a change in isotopic signature of their prey or a switch to an alternative food web. The main conclusions of this study are that (1) there is a partial overlap in the isotopic niches of these three congeneric species and that (2) they responded similarly to changes that likely occurred at the base of their food chain between the 2 years of the study. Article in Journal/Newspaper Antarc* Antarctica Powell Island Pygoscelis adeliae South Orkney Islands Wiley Online Library Austral Powell Island ENVELOPE(-45.050,-45.050,-60.700,-60.700) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Ecology and Evolution 8 7 3660 3674 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Penguins are a monophyletic group in which many species are found breeding sympatrically, raising questions regarding how these species coexist successfully. Here, the isotopic niche of three sympatric pygoscelid penguin species was investigated at Powell Island, South Orkney Islands, during two breeding seasons (austral summers 2013–2014 and 2015–2016). Measurements of carbon (δ 13 C) and nitrogen (δ 15 N) stable isotope ratios were obtained from blood (adults) or feather (chicks) samples collected from Adélie Pygoscelis adeliae , chinstrap P. antarctica , and gentoo P. papua penguins. Isotopic niche regions (a proxy for the realized trophic niches) were computed to provide estimates of the trophic niche width of the studied species during the breeding season. The isotopic niche regions of adults of all three species were similar, but gentoo chicks had noticeably wider isotopic niches than the chicks of the other two species. Moderate to strong overlap in isotopic niche among species was found during each breeding season and for both age groups, suggesting that the potential for competition for shared food sources was similar during the two study years, although the actual level of competition could not be determined owing to the lack of data on resource abundance. Clear interannual shifts in isotopic niche were seen in all three species, though of lower amplitude for adult chinstrap penguins. These shifts were due to variation in carbon, but not nitrogen, isotopic ratios, which could indicate either a change in isotopic signature of their prey or a switch to an alternative food web. The main conclusions of this study are that (1) there is a partial overlap in the isotopic niches of these three congeneric species and that (2) they responded similarly to changes that likely occurred at the base of their food chain between the 2 years of the study. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Tarroux, Arnaud Lydersen, Christian Trathan, Philip N. Kovacs, Kit M. |
spellingShingle |
Tarroux, Arnaud Lydersen, Christian Trathan, Philip N. Kovacs, Kit M. Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
author_facet |
Tarroux, Arnaud Lydersen, Christian Trathan, Philip N. Kovacs, Kit M. |
author_sort |
Tarroux, Arnaud |
title |
Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
title_short |
Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
title_full |
Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
title_fullStr |
Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
title_full_unstemmed |
Temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
title_sort |
temporal variation in trophic relationships among three congeneric penguin species breeding in sympatry |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/ece3.3937 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.3937 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.3937 |
long_lat |
ENVELOPE(-45.050,-45.050,-60.700,-60.700) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Austral Powell Island South Orkney Islands |
geographic_facet |
Austral Powell Island South Orkney Islands |
genre |
Antarc* Antarctica Powell Island Pygoscelis adeliae South Orkney Islands |
genre_facet |
Antarc* Antarctica Powell Island Pygoscelis adeliae South Orkney Islands |
op_source |
Ecology and Evolution volume 8, issue 7, page 3660-3674 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.3937 |
container_title |
Ecology and Evolution |
container_volume |
8 |
container_issue |
7 |
container_start_page |
3660 |
op_container_end_page |
3674 |
_version_ |
1800741100296601600 |