Figure 2.

Islands and continents of speciation. Based on data from aligned core genomes of Vibrio cyclitrophicus (Shapiro et al. 2012) (upper panel) and Sulfolobus islandicus (Cadillo-Quiroz et al. 2012) (lower panel), the distribution of divergent single nucleotide polymorphisms (SNPs) (divSNPs) fixed between populations is plotted along the genome as black bars. Vibrio and Sulfolobus contain, respectively, 725 divSNPs distributed more than ∼1% of the genome, and 4232 divSNPs distributed more than ∼36% of the genome. Scale is approximate for divSNPs (y-axis) and genome position (x-axis). The y-axis is not to scale for SNPs rejecting differentiation between populations (regions of the genome shown in gray).