Fig. 6

a Results from Bayesian clustering (STRUCTURE), b spatial distribution patterns of within lineage genetic groups and c relationship between genetic differentiation and geographical distance for the two B. alpinus lineages (A and B). a Bayesian assignment probabilities of A and B individuals into six and two inferred clusters, respectively. Each individual is represented by a vertical line (x axis) partitioned into K colored segments that represent the individual's estimated membership proportion in each of the K clusters (y axis). Sampling site labels (letters along the x axis) are identical to Fig. 1 (see also Additional file 1). b Membership probabilities averaged across all individuals per population for lineages A and B. The colors correspond to colors in panel (a). c Relationship between within-lineage pairwise population differentiation (F _ST) and Euclidean distances. Pairwise population affiliation comprising identical or different sub-clusters is indicated with a number or "diff", respectively. Each population was assigned to the genetic cluster with the highest probability across individuals (e.g., the lineage A population in the top left corner of (b) would be assigned to yellow)