To detect the genetic structure at the population level, Bayesian analysis was performed using Structure software . In order to determine the ideal number of clusters (K), simulations were performed assuming that any number of clusters could be obtained between 1 and 10, with each simulation repeated 10 times. For this analysis, the no admixture ancestry model was used and the allelic frequencies were correlated by 10,000 burn-in and 100,000 MCMC (Markov chain Monte Carlo) repeats after burn-in. The Structure Harvester program  was used for the definition of K (number of clusters—genetic groups), which is more probable than those proposed by the analysis the criteria suggested by EVANO et al. .