Abstract # 53:

Scheduled for Saturday, September 19, 2009 06:30 PM-09:00 PM: Session 5 (Mission Bay Ballroom CDE) Poster Presentation


K. Becker1, W. Dittus2,3,4, R. Kumarasingha5 and P. Nürnberg1
1Cologne Center for Genomics (CCG), University of Cologne, Köln 50674 , Germany, 2Smithsonian Institution Primate Project, Kandy, Sri Lanka, 3Institution of Fundamental Studies, Kandy, Sri Lanka, 4Department of Conservation Biology, National Zoological Park, Smithsonian Institution, Washington, D.C., USA, 5Department of Veterinary Pathobiology, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka

Inbreeding depression affects a variety of animal and plant taxa both on population and individual basis. Sex-biased dispersal is the primary mechanism to avoid inbreeding in many cercopithecine primates. However there are situations in which relatives of opposite sex interact e.g. adult males not dispersing from their natal group may have the opportunity to mate with related females. We examined the prevalence of inbreeding in a wild population of toque macaques (Macaca sinica) from the Polonnaruwa Nature Sanctuary, Sri Lanka. The study population is large [N>1,100 in any one year] and not isolated. Parentage was assessed for 1113 individuals. With a substantial sample of long-term (4 decades) demographic, genetic and behavioural data our aim was to test whether the observed instances of inbreeding were less than those expected based on the number of opportunities. 12 [1.08%] individuals had an inbreeding coefficient F≥0.125. Males avoided mating with mothers, maternal grandmothers, maternal half-sisters, -aunts, and -nieces [Fisher’s exact test, n=131, p<0.001]. Mating with more distantly maternal related females, e.g. cousins was not avoided [Fisher’s exact test, n=67, p=0.43]. Inbreeding with paternal kin was not avoided either between father and daughter [Fisher’s exact test, n=28, p=0.31] or between familiar and unfamiliar paternal half-siblings [Fisher’s exact test, n=43, p=0.61].