Fig 8. The role of ecological opportunity on divergence and diversity.
(A) The within-population nucleotide diversity (ecotypes combined by lake) positively correlates with ecosystem size. Points are colored by the number of sympatric ecotypes within each lake. (B) The difference in ecosystem size, a proxy for ecological opportunity, explains part of the variation in the direction of phenotypic change (θP) between ecotype pairs, within lineages (white points) and across lineages (grey points). (C) Similarly, variation in ecosystem size is also correlated with the direction of allele frequency differentiation in putatively adaptive loci (θRDA). Each panel shows the linear model or Mantel test result.