Landscape of divergence across the genome and correlation between genomic islands and genome-wide divergence. (A) Genome-wide ZFST screen in 50-kb windows across 12 species pairs of Darwin's finches. Scaffolds were ordered along the zebra finch genome, and chromosomes are numbered according to the zebra finch nomenclature. Red dashed lines indicate a ZFST of four as the threshold to define islands of divergence. Genomic locations of the ALX1 and HMGA2 related to beak morphology are indicated. (B) Number of genomic islands against genomic divergence. (C) Mean size of genomic islands against genomic divergence. Each dot represents a species pair. Correlations are tested with Pearson's correlation coefficient test.
