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MBE Advance Access originally published online on October 13, 2004
Molecular Biology and Evolution 2005 22(2):297-307; doi:10.1093/molbev/msi017
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Molecular Biology and Evolution vol. 22 no. 2 © Society for Molecular Biology and Evolution 2005; all rights reserved.

Research Article

Divergence Population Genetics of Chimpanzees

Yong-Jin Won and Jody Hey

Department of Genetics, Rutgers the State University of New Jersey, Piscataway, New Jersey

E-mail: hey{at}biology.rutgers.edu.

The divergence of two subspecies of common chimpanzees (Pan troglodytes troglodytes and P. t. verus) and the bonobo (P. paniscus) was studied using a recently developed method for analyzing population divergence. Under the isolation with migration model, the posterior probability distributions of divergence time, migration rates, and effective population sizes were estimated for large multilocus DNA sequence data sets drawn from the literature. The bonobo and the common chimpanzee are estimated to have diverged approximately 0.86 to 0.89 MYA, and the divergence of the two common chimpanzee subspecies is estimated to have occurred 0.42 MYA. P. t. troglodytes appears to have had a larger effective population size (22,400 to 27,900) compared with P. paniscus, P. t. verus, and the ancestral populations of these species. No evidence of gene flow was found in the comparisons involving P. paniscus; however a clear signal of unidirectional gene flow was found from P. t. verus to P. t. troglodytes (2Nm = 0.51).

Key Words: Chimpanzee • Bonobo • Markov chain Monte Carlo • speciation • gene flow


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