“…This is consistent with the hypothesis that incompatibility genes should be sheltered from interspecific gene flow and therefore stand out as more differentiated than surrounding regions (e.g., Berner & Roesti, ; Feder, Flaxman, Egan, & Nosil, ; Nosil, Funk, & OrtizâBarrientos, ; Turner et al, ). However, a heterogeneous landscape of genomic differentiation is expected even without gene flow, predominantly as an effect of regional variation in recombination rate (Buerkle, ; Burri, ; Cruickshank & Hahn, ; Ellegren & Wolf, ; Jiggins & Martin, ; Lohse, ; Nachman & Payseur, ; Ravinet et al, ; Van Doren et al, ). Although the exact pinpointing of genes involved in reproductive isolation likely is out of reach in most natural study systems, a genome scan approach in recently diverged species can inform on the main molecular mechanisms and evolutionary forces underlying global patterns of genomic divergence during initial stages of the speciation process (Jiggins & Martin, ; Seehausen et al, ; Wolf & Ellegren, ; Zimmer et al, ).…”