Fig. 4. Migration rate among four group, between species.
According to the method of EVANNO, a maximum likelihood (∆K ) was
used to determine the value of K . In this study, when K =2,∆K reached the maximum value (Fig. 5). The four groups were
divided into two species. Unexpected, the potential K value for
the OLb group was not 2 but 4. Mixed individuals were found between and
within the four groups, indicating that there have gene flow among
groups and species.