Figure 2. Comparison of the divergence across the genome in five parapatric lake-river pairs.

Panels are ordered by increasing overall divergence (Us, G2, No, G1, Ca). Divergence (F_ST) was averaged over 10 kb windows (small, light blue dots). Windows with exceptional differentiation (1,530 outlier windows) are highlighted with a population-specific color. Grey lines indicate smoothened averages across windows. All 20 autosomes excluding the sex chromosome (LG XIX) are shown along the x-axis in ascending order (light brown). We only find a weak correlation of F_ST values across the autosomes between the two geographically closest population pairs (G1 and G2, 34958 windows, Pearson correlation r = 0.0595, P << 0.001).