Figure 9.

Demographic models that best explained the data observed in this study. N₁ and N₂: effective size of population 1 and 2; N_a: effective size of the ancestral population; Nf₁ and Nf₂: effective size of population 1 and 2 after the split (differences in population size parameters are approximately reflected by the width of each box); T_split: time of split at which the ancestral population subdivides in two populations; T_dem: time of the expansion of the population; T_sc: time of secondary contact at which the two populations start exchanging genes; M₁₂ and M₂₁: introgression rates from population 2 to 1 and from population 1 to 2, respectively (blue arrows). (a) Analysis for A. boucheti/A. kojimai; (b) analysis for A. kojimai/A. strummeri.