Figure 4

A Bayesian tree from the mitochondrial cytochrome b gene data. Bold branches and p. represent haplotypes of Pelophylax plancyi and others are P. nigromaculatus unless otherwise indicated. The numbers above the branches are Bayesian posterior probabilities. Divergence times were estimated from a reduced data set; divergence times in parentheses are confidence intervals at 95% level. Numbers within circles indicated close association between haplotypes of P. nigromaculatus and P. plancyi, which likely represent independent mitochondrial genome introgression events.