Figure 3.

(a) Illustration of the best‐supported demographic model, isolation with migration with heterogeneous migration rate and population size (“IMhmhn”). Light grey represents loci evolving with large population size (N_eD1, N_eL1), and dark grey represents the loci with reduced population size (N_eD2, N_eL2); arrows indicate migration and barrier loci (dotted lines, not drawn to scale). (b) Joint site frequency spectra of the data and under the IMhmhn model [Colour figure can be viewed at wileyonlinelibrary.com]