Figure 2: Discriminant analysis of principal components (DAPC) results.

(a) Principal component scatter plot of all individuals, based on the DAPC output, and (b) the optimal number of clusters (K) as determined by ‘k-means’, a clustering algorithm which looks for the value of K that maximises the variation between groups. The Bayesian Information Criterion (BIC) is plotted for K = 1–9 and the ‘elbow’ in the graph at K = 3 indicates this to be the most likely value of K. KI = Kangaroo Island cluster, Eastern = Eastern cluster, FGR = Finders/Gammon Ranges cluster.