Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning
Abstract Sexual size dimorphism ( SSD ) implies correlated differences in energetic requirements and feeding opportunities, such that sexes will face different trade‐offs in habitat selection. In seasonal migrants, this could result in a differential spatial distribution across the wintering range....
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crwiley:10.1002/ece3.1213 2024-09-09T19:26:54+00:00 Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning Duijns, Sjoerd van Gils, Jan A. Spaans, Bernard ten Horn, Job Brugge, Maarten Piersma, Theunis Metawad NWO-VIDI 2014 http://dx.doi.org/10.1002/ece3.1213 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.1213 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.1213 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.1213 en eng Wiley http://creativecommons.org/licenses/by/3.0/ Ecology and Evolution volume 4, issue 20, page 4009-4018 ISSN 2045-7758 2045-7758 journal-article 2014 crwiley https://doi.org/10.1002/ece3.1213 2024-08-13T04:12:55Z Abstract Sexual size dimorphism ( SSD ) implies correlated differences in energetic requirements and feeding opportunities, such that sexes will face different trade‐offs in habitat selection. In seasonal migrants, this could result in a differential spatial distribution across the wintering range. To identify the ecological causes of sexual spatial segregation, we studied a sexually dimorphic shorebird, the bar‐tailed godwit L imosa lapponica , in which females have a larger body and a longer bill than males. With respect to the trade‐offs that these migratory shorebirds experience in their choice of wintering area, northern and colder wintering sites have the benefit of being closer to the Arctic breeding grounds. According to Bergmann's rule, the larger females should incur lower energetic costs per unit of body mass over males, helping them to winter in the cold. However, as the sexes have rather different bill lengths, differences in sex‐specific wintering sites could also be due to the vertical distribution of their buried prey, that is, resource partitioning. Here, in a comparison between six main intertidal wintering areas across the entire winter range of the lapponica subspecies in northwest Europe, we show that the percentage of females between sites was not correlated with the cost of wintering, but was positively correlated with the biomass in the bottom layer and negatively with the biomass in the top layer. We conclude that resource partitioning, rather than relative expenditure advantages, best explains the differential spatial distribution of male and female bar‐tailed godwits across northwest Europe. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Ecology and Evolution 4 20 4009 4018 |
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English |
description |
Abstract Sexual size dimorphism ( SSD ) implies correlated differences in energetic requirements and feeding opportunities, such that sexes will face different trade‐offs in habitat selection. In seasonal migrants, this could result in a differential spatial distribution across the wintering range. To identify the ecological causes of sexual spatial segregation, we studied a sexually dimorphic shorebird, the bar‐tailed godwit L imosa lapponica , in which females have a larger body and a longer bill than males. With respect to the trade‐offs that these migratory shorebirds experience in their choice of wintering area, northern and colder wintering sites have the benefit of being closer to the Arctic breeding grounds. According to Bergmann's rule, the larger females should incur lower energetic costs per unit of body mass over males, helping them to winter in the cold. However, as the sexes have rather different bill lengths, differences in sex‐specific wintering sites could also be due to the vertical distribution of their buried prey, that is, resource partitioning. Here, in a comparison between six main intertidal wintering areas across the entire winter range of the lapponica subspecies in northwest Europe, we show that the percentage of females between sites was not correlated with the cost of wintering, but was positively correlated with the biomass in the bottom layer and negatively with the biomass in the top layer. We conclude that resource partitioning, rather than relative expenditure advantages, best explains the differential spatial distribution of male and female bar‐tailed godwits across northwest Europe. |
author2 |
Metawad NWO-VIDI |
format |
Article in Journal/Newspaper |
author |
Duijns, Sjoerd van Gils, Jan A. Spaans, Bernard ten Horn, Job Brugge, Maarten Piersma, Theunis |
spellingShingle |
Duijns, Sjoerd van Gils, Jan A. Spaans, Bernard ten Horn, Job Brugge, Maarten Piersma, Theunis Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
author_facet |
Duijns, Sjoerd van Gils, Jan A. Spaans, Bernard ten Horn, Job Brugge, Maarten Piersma, Theunis |
author_sort |
Duijns, Sjoerd |
title |
Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
title_short |
Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
title_full |
Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
title_fullStr |
Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
title_full_unstemmed |
Sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
title_sort |
sex‐specific winter distribution in a sexually dimorphic shorebird is explained by resource partitioning |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1002/ece3.1213 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.1213 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.1213 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.1213 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Ecology and Evolution volume 4, issue 20, page 4009-4018 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1002/ece3.1213 |
container_title |
Ecology and Evolution |
container_volume |
4 |
container_issue |
20 |
container_start_page |
4009 |
op_container_end_page |
4018 |
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1809896438308536320 |