Abstract
Mexican prairie dogs from three locations were analyzed for variation at 46 electrophoretic loci. Fourteen (30%) of the loci were polymorphic. Genetic distances between populations were low (range of Rogers' D , 0.033 to 0.045), indicating little genic differentiation. The mean F st over all variable loci was 0.07 and indicated significant heterogeneity among the populations sampled. The genetic structure of Mexican prairie dog populations appears comparable to that of black-tailed prairie dog populations over short geographic distances. Cynomys mexicanus is distinctly different from C. ludovicianus , its purported ancestral species, at only two loci examined and the two species are separated by a genetic distance (Nei, 1972) of only 0.057. The estimated time since divergence based on genetic distance is 42,180 yr.
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