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Turnover in male dominance offsets the positive effect of polygyny on within-group relatedness

Dyble, Mark; Clutton-Brock, Tim H; (2023) Turnover in male dominance offsets the positive effect of polygyny on within-group relatedness. Behavioral Ecology 10.1093/beheco/arac121. (In press). Green open access

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Abstract

Evidence of an association between cooperative breeding systems and average coefficients of relatedness between group members in vertebrates have led to increased interest in the social and ecological factors affecting average kinship within groups. Previous studies have suggested that polygynous mating systems and high degrees of male reproductive skew increase average relatedness because they increase the proportion of offspring born in each group that are paternal siblings. Although this may be the case in semelparous organisms, in many multiparous polygynous animals, intense competition between males shortens the breeding tenure of males and leads to their frequent replacement by competitors which reduces paternal relatedness and average kinship between members of multigenerational groups. Here, we explore the interaction between male reproductive skew and the frequency of turnover in breeding males and its effects on within-group relatedness. Our theoretical model shows that increases in rates of dominance turnover in polygynous systems can offset the positive effect of male skew on relatedness between group members within seasons, showing that polygynous mating systems will not necessarily lead to significant increases in average relatedness, especially in species where there is extensive overlap between generations among group members.

Type: Article
Title: Turnover in male dominance offsets the positive effect of polygyny on within-group relatedness
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/beheco/arac121
Publisher version: https://doi.org/10.1093/beheco/arac121
Language: English
Additional information: © The Author(s) 2023. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: kinship, polygyny, relatedness, reproductive skew
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Anthropology
URI: https://discovery.ucl.ac.uk/id/eprint/10165016
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