Distributions of divergence across the genome for diverging silvereye populations. (A) Pairwise F_ST across the genome for each population comparison calculated in non-overlapping 50kb windows. Regions of elevated differentiation (genomic islands) are highlighted in red and regions with low differentiation (genomic valleys) are highlighted in blue. Arrows beside genomic islands/valleys indicate if d_xy within these regions was significantly elevated (upwards pointing arrows) or decreased (downward pointing arrows) compared to chromosomal background levels. Significance determined using Wilcoxon signed-rank tests. Chromosomes are numbered according to the zebra finch nomenclature. (B) Distributions of windowed F_ST values calculated in 50kb windows for each comparison. Distributions are shown for Autosomes and Chromosome Z separately.