Figure 4: STRUCTURE analysis results. In each case, the appropriate
value of K was determined from ΔK . Population numbers,
corresponding to those in Figure 1, are shown along the top of each
panel. Populations in which red-flowered individuals were sampled are
indicated by asterisks along the bottom of each panel. (a) Cluster
analysis results for SNPs in all populations (K = 2, 3). The
relative relationship between average spur length relative and average
visitor size (only bumblebees) in each population is shown by the
relative sizes of the purple and yellow circles. Cluster analysis
results for SNPs of only the (b) Utsukushigahara (K = 3), (c)
Norikura+Ontake (K = 3), and (d) Iizuna (K = 2) regions.