Figure 8
From: Species and gene divergence in Littorina snails detected by array comparative genomic hybridization
PCA plots comparing genomic hybridizations of Littorina species. a) Four species, all sequences (25,801 genes). b) Four species, only BAC fragments (580 genes). c) Four species, only mt DNA sequences (16 genes). d) Three sibling species, based on genes with significant variation among species (n = 1,094). e) Three sibling species and geographic populations of L. saxatilis, based on genes with significant variation among these groups (n = 2,232). f) Geographic populations of L. saxatilis, based on genes with significant variation among groups (n = 756). Also shown are numbers of significant genes for pairwise comparison of the populations.