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Temporal dynamics and fitness consequences of coalition formation in male primates

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Neumann,  Christof
Research Group Primate Behavioural Ecology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Junior Research Group of Primate Kin Selection, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

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Kulik,  Lars
Research Group Primate Behavioural Ecology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Junior Research Group of Primate Kin Selection, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

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Engelhardt,  Antje       
Research Group Primate Behavioural Ecology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

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Widdig,  Anja       
Research Group Primate Behavioural Ecology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Human Behavior Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Junior Research Group of Primate Kin Selection, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

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Neumann_Temporal_ProcRoySocLonB_Suppl__2022.pdf
(Supplementary material), 570KB

Citation

Neumann, C., Kulik, L., Agil, M., Engelhardt, A., & Widdig, A. (2022). Temporal dynamics and fitness consequences of coalition formation in male primates. Proceedings of the Royal Society B: Biological Sciences, 289(1976): 20212626. doi:10.1098/rspb.2021.2626.


Cite as: https://hdl.handle.net/21.11116/0000-000B-9AFC-C
Abstract
Coalition formation is one of the most striking forms of cooperation found in animals. Yet, there is substantial variation between taxa regarding the mechanisms by which coalitions can result in fitness consequences. Here, we investigate the influence of coalitions on dominance rank trajectories and subsequently on reproductive success in wild male crested macaques (Macaca nigra) at Tangkoko Nature Reserve (Sulawesi, Indonesia). We observed 128 coalition events involving 28 males and tested how a variety of coalition properties and factors related to the social environment influenced future male rank. We further used genetic paternity analysis of 19 infants conceived during the study to assess male reproductive success. Our results show that males participating in coalitions achieved higher-than-expected future ranks, while coalition targets had lower-than-expected future ranks. Additionally, all-up coalitions had stronger effects on rank than all-down and bridging coalitions, and these were modulated by the relative strength of coalition partners versus targets. Finally, higher ranking males were more likely to sire infants than lower ranking males. These results provide important insights regarding the mechanisms underlying coalition formation and support the idea that one major path by which coalitions can affect fitness is through influencing male dominance trajectories.