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Genetic and demographic structure in a population of Ctenomys lami (Rodentia-Ctenomyidae).

The variability at eight microsatellite loci was analyzed in 88 individuals of Ctenomys lami, a species of tuco-tucos. Initially considered as three subpopulations, the estimated Fst values ranged from 0.0007 to 0.0589. Additionally, a Bayesian approach presented probabilities of 0.9933 for the existence of only one population. A Fis value of 0.19 could indicate an incipient structure. Sexual dimorphism was observed. The reproductive period was short and a seasonal pattern was observed with sex ratio of 1:1 during all seasons. Presence of recent bottleneck is described suggesting further research in this population to assess more complete and detailed data.