Fig. 2

Geographic partitioning of L. granatensis genetic variation. Principal component analysis of genetic variation in L. granatensis polarized by a, b L. timidus (based on 40,902 independent SNPs) or c, d L. americanus (based on 40,961 independent SNPs). The coordinates of these outgroups are out of the represented range along PC1, in the direction of the arrows, whose positions give their coordinates along PC2. The percentage of variation explained by each axis is given in parentheses. The central and right panels show the correlations between PC1 and PC2 coordinates, respectively, and geographic distance to the southernmost sample. Dashed lines indicate linear regression trendlines. Population names are as in Fig. 1a and Additional file 1: Table S1