The AMOVA showed that the greatest variation was within the populations (66.71%) compared to the variation among populations (33.29%). GST, the index of the genetic differentiation that considers how the genetic diversity is distributed among the populations was 0.33. The correlation between the Nei’s genetic distances and the geographical distances (in km) between populations (Table 5) was positive and significant (r = 0.77; p < 0.01), as estimated by the Mantel test.