Paternity and relatedness in wild chimpanzee communities

Linda Vigilant · Michael Hofreiter · Heike Siedel · Christophe Boesch

321 citations0/0 files storedProceedings of the National Academy of Sciences

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Primate Behavior and Ecology Genetic diversity and population structure Animal Behavior and Reproduction

Abstract

The genetic structure of three contiguous wild chimpanzee communities in West Africa was examined to determine the extent to which the community, the mixed-sex social unit of chimpanzees, represents a closed reproductive unit. An analysis of paternity for 41 offspring resulted in 34 cases of paternity assignment to an adult male belonging to the same community. Among the 14 offspring for which all potential within-community fathers have been tested, one likely case of extra-group paternity (EGP) has been identified, suggesting an incidence of EGP of 7%. This more extensive analysis contradicts a previous genetic study of the Tai chimpanzees that inferred 50% extra-group fathers. We suggest, based on direct comparison of results for 33 individuals at 1 microsatellite locus and direct comparison of paternity assignments for 11 offspring, that the error rate in the previous study was too high to produce accurate genotypes and assignments of paternity and hence caused the false inference of a high rate of EGP. Thus, the community is the primary but not exclusive unit for reproduction in wild chimpanzees, and females do not typically reproduce with outside males. Despite the inferred low level of gene flow from extra-community males, relatedness levels among the community males are not significantly higher than among community females, and the distribution of genetic relationships within the group suggests that, rather than a primarily male-bonded social structure, the group is bonded through relationships between males and females. Kinship may explain cooperative behaviors directed against other communities, but is unlikely to explain the high levels of affiliation and cooperation seen for male within-community interactions.

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References

1963The Evolution of Altruistic Behavior 1964Group Selection and Kin Selection 2000The Chimpanzees of the Taï Forest 1997The Chimpanzees of Gombe 1987The Evolution of Human Behavior: Primate Models.1994Cooperative hunting in wild chimpanzees 1997The Influence of Dominance Rank on the Reproductive Success of Female Chimpanzees 1979Mating patterns and reproductive strategies in a community of wild chimpanzees (Pan troglodytes schweinfurthii)

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2009Male dominance rank and reproductive success in chimpanzees, Pan troglodytes schweinfurthii 2005Male competition and paternity in wild chimpanzees of the Taï forest 2009Kinship and social bonds in female chimpanzees ( Pan troglodytes )2011Spontaneous prosocial choice by chimpanzees 2006Pathogens as drivers of population declines: The importance of systematic monitoring in great apes and other threatened mammals 2003Food Competition and Linear Dominance Hierarchy Among Female Chimpanzees of the Taï National Park

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