Abstract
A universal aspect of mammalian sociality is substantive, core relationships among relatives. Although comparative studies of nonhuman primates have clarified the adaptive importance of kinship, previous research has focused primarily on maternal relatives. To rectify this gap in the literature, recent work has begun to examine the social and adaptive consequences of paternal kinship. However, among multimale-multifemale species, particularly Old World primates, there have been conflicting reports describing the social bonds among paternal relatives. Some researchers have suggested that this inconsistency results from the availability of preferred relatives (maternal kin) as social partners. To explore this hypothesis, we examine the relationship between the availability of kin and sociality among immature olive baboons (Papio hamadryas anubis) by considering the effects that parents have on the social bonds among young maternal and paternal half-siblings. We found that while the presence of a mother in the group did not affect social bonds among immatures, the presence of a father did have a significant impact. Compared to immatures whose fathers were absent from the group, individuals with a father present maintained stronger bonds with paternal half-siblings. These data may help explain some of the variation in previous results among different studies examining the social bonds of half-siblings. Furthermore, our study suggests that the development of relationships among paternal half-siblings is facilitated by fathers and that relationships with paternal kin may be just as critical as those with maternal kin.
Significance statement
This study indicates that even in a social system in which matrilineal kinship powerfully influences group structure and dynamics, paternal kinship may nevertheless form the basis of significant selective forces in social evolution.
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Acknowledgments
The research was sponsored by the Ministry of Science and Technology of Kenya, the National Museums of Kenya, and the Institute of Primate Research, Nairobi. We are extremely grateful to J. Zeitz for support of the project research on Segera Ranch, and to Ngali ole Resin Lenguya, Patrick Leparleen, Redman Lodungokiok, the staff of ADC Mutara and Segera Ranch, and the residents of Thome B for their important assistance throughout the study. We are also grateful for the contributions from the National Science Foundation BCS-1028750, the L.S.B. Leakey Foundation, and the Fulbright (IIE) Foundation and the Center for Human Evolutionary Studies (Rutgers University). Layon Lenguya assisted significantly in the collection of data. In addition, Mohammed Boru, Lisa Danish, and Nancy Moinde made important contributions throughout the data collection period. We thank Francis Ngasike Kokoi and Anne Nakaredi for their assistance to maintaining the field site. We thank Mary Kelaita for her help with the genetic analysis and John Snyder for his help with the statistical analysis. We appreciate the helpful comments made by Anja Widdig, Robert Scott, and Lee Cronk on this manuscript and contributions made by the reviewers.
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ECL has received funding from the National Science Foundation BCS-1028750, the L.S.B. Leakey Foundation, the Fulbright (IIE) Foundation, and the Center for Human Evolutionary Studies (Rutgers University).
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed (Kenyan Ministry of Education, Science and Technology: MOEST 13/001/29C 120).
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The datasets analyzed during the current study can be made available from the corresponding author on reasonable request.
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Lynch, E.C., Di Fiore, A., Lynch, R.F. et al. Fathers enhance social bonds among paternal half-siblings in immature olive baboons (Papio hamadryas anubis). Behav Ecol Sociobiol 71, 120 (2017). https://doi.org/10.1007/s00265-017-2336-y
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DOI: https://doi.org/10.1007/s00265-017-2336-y