Abstract # 107:

Scheduled for Friday, June 21, 2013 10:30 AM-10:45 AM: Session 12 (Auditorium) Oral Presentation


T. J. Olivier1, C. J. Jolly2, J. Phillips-Conroy3 and J. Rogers4
1Green Creek Paradigms, LLC, 4632 Green Creek Road, Schuyler, VA 22969-1602, USA, 2Dept. of Anthropology, New York University, New York, NY, 3Dept. of Anatomy and Neurobiology, Washington Univ. St. Louis, MO, 4Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX
     Hybridization between genetically and morphologically differentiated populations occurs in various primate taxa. This study uses computer simulations to investigate potential patterns of genetic dynamics in the hybrid zone between small kinda baboons (Papio kindae) and larger grayfooted chacma (P. ursinus griseipes) in Zambia. Simulations modeled 48 populations of 40 members each, arranged in a 16 x 3 grid. The starting population includes two base types: large-bodied chacmas and small-bodied kindas. Initially, base types were geographically segregated across a linear contact zone, and fixed for alternative autosomal, Y-linked and mitochondrial genetic markers. Adult males migrate. Simulations last 100 time periods, and individual animals survive up to five. We studied population genetic and demographic effects of different migration schemes: migration only between adjacent groups versus adjacent plus long-distance migration. We also tested the effect of increased risk of fetal loss in matings between larger males and smaller females, assuming admixed individuals would vary in size depending on ancestry. Risk of fetal loss alters demographic and genetic effects of migration by chacma males into kinda groups by reducing migrant fitness. In simulations with long distance migration and fetal loss, frequencies of autosomal and Y-linked traits initially fixed in chacmas were reduced, especially in areas initially occupied by kindas. These results demonstrate complex interplay between dispersal patterns, gene flow, phenotypic diversity and possible reproductive consequences of phenotypic differences.