Figure 5.

Population structuring among the whitefish morphs in the study lakes. The population structure of densely (D), large sparsely (L), and small sparsely (S) rakered whitefish morphs from L. Langfjordvatn (Lf), L. Skrukkebukta (Sb), and L. Tjærebukta (Tb) was inferred from a combination of a unrooted neighbor-joining (NJ) tree using Nei's standard genetic distance (D_S) and three rounds of hierarchical STRUCTURE analysis. Only bootstrap resampling percentages above 50 are shown for the NJ tree. The colored dots at the branch ends refer to the phenotypic and ecological designation in Fig. 3. In the hierarchical STRUCTURE analysis, black lines separate individuals from different sampling sites (labeled right), and each individual is represented by a thin horizontal line, which is partitioned into K-colored segments representing individual's estimated membership fractions in K clusters. Vertical black lines delineate the progress of the hierarchical approach, where subsets of the data were subsequently analyzed. For each cluster, absolute values of ln Pr(X|K) and ΔK are plotted for subsequent values of K (Fig. S1). The colors used the estimated membership are not related to the colors used for the phenotypic and ecological designation in Fig. 3.