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The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl
In structured populations, competition for reproductive opportunities should be relaxed among related males. The few tests of this prediction often neglect the fact that sexual selection acts through multiple mechanisms, both before and after mating. We performed experiments to study the role of wit...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5324671/ https://www.ncbi.nlm.nih.gov/pubmed/27925168 http://dx.doi.org/10.1111/evo.13145 |
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author | Tan, Cedric Kai Wei Doyle, Philippa Bagshaw, Emma Richardson, David S. Wigby, Stuart Pizzari, Tommaso |
author_facet | Tan, Cedric Kai Wei Doyle, Philippa Bagshaw, Emma Richardson, David S. Wigby, Stuart Pizzari, Tommaso |
author_sort | Tan, Cedric Kai Wei |
collection | PubMed |
description | In structured populations, competition for reproductive opportunities should be relaxed among related males. The few tests of this prediction often neglect the fact that sexual selection acts through multiple mechanisms, both before and after mating. We performed experiments to study the role of within‐group male relatedness across pre‐ and postcopulatory mechanisms of sexual selection in social groups of red junglefowl, Gallus gallus, in which two related males and one unrelated male competed over females unrelated to all the males. We confirm theoretical expectations that, after controlling for male social status, competition over mating was reduced among related males. However, this effect was contrasted by other sexual selection mechanisms. First, females biased male mating in favor of the unrelated male, and might also favor his inseminations after mating. Second, males invested more—rather than fewer—sperm in postcopulatory competition with relatives. A number of factors may contribute to explain this counterintuitive pattern of sperm allocation, including trade‐offs between male investment in pre‐ versus postcopulatory competition, differences in the relative relatedness of pre‐ versus postcopulatory competitors, and female bias in sperm utilization in response to male relatedness. Collectively, these results reveal that within‐group male relatedness may have contrasting effects in different mechanisms of sexual selection. |
format | Online Article Text |
id | pubmed-5324671 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-53246712017-03-14 The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl Tan, Cedric Kai Wei Doyle, Philippa Bagshaw, Emma Richardson, David S. Wigby, Stuart Pizzari, Tommaso Evolution Original Articles In structured populations, competition for reproductive opportunities should be relaxed among related males. The few tests of this prediction often neglect the fact that sexual selection acts through multiple mechanisms, both before and after mating. We performed experiments to study the role of within‐group male relatedness across pre‐ and postcopulatory mechanisms of sexual selection in social groups of red junglefowl, Gallus gallus, in which two related males and one unrelated male competed over females unrelated to all the males. We confirm theoretical expectations that, after controlling for male social status, competition over mating was reduced among related males. However, this effect was contrasted by other sexual selection mechanisms. First, females biased male mating in favor of the unrelated male, and might also favor his inseminations after mating. Second, males invested more—rather than fewer—sperm in postcopulatory competition with relatives. A number of factors may contribute to explain this counterintuitive pattern of sperm allocation, including trade‐offs between male investment in pre‐ versus postcopulatory competition, differences in the relative relatedness of pre‐ versus postcopulatory competitors, and female bias in sperm utilization in response to male relatedness. Collectively, these results reveal that within‐group male relatedness may have contrasting effects in different mechanisms of sexual selection. John Wiley and Sons Inc. 2017-01-05 2017-02 /pmc/articles/PMC5324671/ /pubmed/27925168 http://dx.doi.org/10.1111/evo.13145 Text en © 2016 The Author(s). Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Articles Tan, Cedric Kai Wei Doyle, Philippa Bagshaw, Emma Richardson, David S. Wigby, Stuart Pizzari, Tommaso The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title | The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title_full | The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title_fullStr | The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title_full_unstemmed | The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title_short | The contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
title_sort | contrasting role of male relatedness in different mechanisms of sexual selection in red junglefowl |
topic | Original Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5324671/ https://www.ncbi.nlm.nih.gov/pubmed/27925168 http://dx.doi.org/10.1111/evo.13145 |
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