Fig. 4

Marginal distribution of the posterior probabilities of demographic parameters estimated by IMa2 analysis : (a) θ _A, θ _Sand θ _N are the effective population sizes of ancestral, southern and northern populations, respectively; (b) m _S>N and m _N>S are the gene flow from northern to southern lineage and southern to northern lineage, respectively; (c) the divergence time between southern and northern linage