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Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk

David A Wells, Michael A Cant, Faye J Thompson, Harry H Marshall, Emma I K Vitikainen, Joseph I Hoffman, Hazel Nichols Orcid Logo

Behavioral Ecology, Volume: 32, Issue: 1, Pages: 94 - 104

Swansea University Author: Hazel Nichols Orcid Logo

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DOI (Published version): 10.1093/beheco/araa105

Abstract

Behavioural mechanisms for avoiding inbreeding are common in the natural world and are believed to have evolved as a response to the negative consequences of inbreeding. However, despite a fundamental role in fitness, we have a limited understanding of the cues that individuals use to assess inbreed...

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Published in: Behavioral Ecology
ISSN: 1045-2249 1465-7279
Published: Oxford University Press (OUP) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa55169
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spelling 2021-04-01T12:00:16.2422974 v2 55169 2020-09-13 Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk 43ba12986bd7754484874c73eed0ebfe 0000-0002-4455-6065 Hazel Nichols Hazel Nichols true false 2020-09-13 SBI Behavioural mechanisms for avoiding inbreeding are common in the natural world and are believed to have evolved as a response to the negative consequences of inbreeding. However, despite a fundamental role in fitness, we have a limited understanding of the cues that individuals use to assess inbreeding risk as well as the extent to which individual inbreeding behaviour is repeatable. We used piecewise structural equation modelling of 24 years of data to investigate the causes and consequences of within- versus extra-group paternity in banded mongooses. This cooperatively breeding mammal lives in tight-knit social groups that often contain closely related opposite-sex breeders, so inbreeding can be avoided through extra-group mating. We used molecular parentage assignments to show that, despite extra-group paternity resulting in outbred offspring, within-group inbreeding occurs frequently, with around 16% litters being moderately or highly inbred. Additionally, extra-group paternity appears to be plastic, with females mating outside of their social group according to individual proxies (age and immigration status) and societal proxies (group size and age) of within-group inbreeding risk, but not in direct response to levels of within-group relatedness. While individual repeatability in extra-group paternity was relatively low, female co-breeders showed high repeatability, suggesting a strong constraint arising from the opportunities for extra-group mating. The use of extra-group paternity as an inbreeding avoidance strategy is therefore limited by high costs, opportunity constraints and the limited reliability of proxies of inbreeding risk. Journal Article Behavioral Ecology 32 1 94 104 Oxford University Press (OUP) 1045-2249 1465-7279 2 3 2021 2021-03-02 10.1093/beheco/araa105 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2021-04-01T12:00:16.2422974 2020-09-13T18:28:00.8351700 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences David A Wells 1 Michael A Cant 2 Faye J Thompson 3 Harry H Marshall 4 Emma I K Vitikainen 5 Joseph I Hoffman 6 Hazel Nichols 0000-0002-4455-6065 7 55169__18150__12f88abc47d446289aee0a0d5baee3cc.pdf Supplementary material for press.pdf 2020-09-13T18:50:15.6006342 Output 642438 application/pdf Supplemental material true 2021-12-16T00:00:00.0000000 true eng 55169__18372__01c6b4f92d864522b6551ee73c630c36.pdf 55169.pdf 2020-10-08T12:22:34.6788243 Output 589673 application/pdf Accepted Manuscript true 2021-12-16T00:00:00.0000000 true eng
title Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
spellingShingle Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
Hazel Nichols
title_short Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
title_full Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
title_fullStr Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
title_full_unstemmed Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
title_sort Extra-group paternity varies with proxies of relatedness in a social mammal with high inbreeding risk
author_id_str_mv 43ba12986bd7754484874c73eed0ebfe
author_id_fullname_str_mv 43ba12986bd7754484874c73eed0ebfe_***_Hazel Nichols
author Hazel Nichols
author2 David A Wells
Michael A Cant
Faye J Thompson
Harry H Marshall
Emma I K Vitikainen
Joseph I Hoffman
Hazel Nichols
format Journal article
container_title Behavioral Ecology
container_volume 32
container_issue 1
container_start_page 94
publishDate 2021
institution Swansea University
issn 1045-2249
1465-7279
doi_str_mv 10.1093/beheco/araa105
publisher Oxford University Press (OUP)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
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description Behavioural mechanisms for avoiding inbreeding are common in the natural world and are believed to have evolved as a response to the negative consequences of inbreeding. However, despite a fundamental role in fitness, we have a limited understanding of the cues that individuals use to assess inbreeding risk as well as the extent to which individual inbreeding behaviour is repeatable. We used piecewise structural equation modelling of 24 years of data to investigate the causes and consequences of within- versus extra-group paternity in banded mongooses. This cooperatively breeding mammal lives in tight-knit social groups that often contain closely related opposite-sex breeders, so inbreeding can be avoided through extra-group mating. We used molecular parentage assignments to show that, despite extra-group paternity resulting in outbred offspring, within-group inbreeding occurs frequently, with around 16% litters being moderately or highly inbred. Additionally, extra-group paternity appears to be plastic, with females mating outside of their social group according to individual proxies (age and immigration status) and societal proxies (group size and age) of within-group inbreeding risk, but not in direct response to levels of within-group relatedness. While individual repeatability in extra-group paternity was relatively low, female co-breeders showed high repeatability, suggesting a strong constraint arising from the opportunities for extra-group mating. The use of extra-group paternity as an inbreeding avoidance strategy is therefore limited by high costs, opportunity constraints and the limited reliability of proxies of inbreeding risk.
published_date 2021-03-02T04:09:11Z
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