The genetic structure of a primate species: Rhesus macaques and other Cercopithecine monkeys |
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Authors: | Don J Melnick |
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Institution: | (1) Genetics Laboratory, Department of Anthropology, Columbia University, 10027 New York, New York |
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Abstract: | Among rhesus macaques (Macaca mulatta)and other cercopithecine monkeys, social groups occupying adjacent home ranges (i.e., members of the same local population)
exchange individuals and genes and thus exhibit marked genetic similarities. To assess the degree to which this pattern extends
beyond the local population, the genetic structure of M. mulattaand six other primate species was determined using Nei’s (1973) gene-diversity analysis. The genetic similarities seen among
social groups in the Dunga Gali population of M. mulatta (Melnick et al.,1984a) can be seen over the entire species range. Comparison of these results with the structures of other similarly organized
primate species indicates that (1) the average social group contains most of its local population’s genetic diversity, (2)
the average local population contains the majority of the genetic diversity found in the region to which it belongs, and (3)
the proportion of species gene diversity found in the average regional population varies substantially between species. Genetic
homogeneity within local and regional populations is probably the product of gene flow. The application of a number of analytical
models of selection and gene flow strongly suggests that gene flow, genetic drift, and zoogeography offer a more parsimonious
and plausible explanation for interspecific variation in regional differentiation than does stabilizing selection. |
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Keywords: | rhesus monkey macaques genetic structure migration selection |
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