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Inference of the optimal number of clusters according to the ΔK-statistic (Evanno et al. 2005). For each of the 12 species, the red line shows the value of ΔK for the full data set (secondary Y-axis); the histograms show the frequency at which each value of K was inferred to be the optimal value among 100 of the 500 subsampled data sets (primary Y-axis)
