Population structure of 132 domestic dog breeds. On the left of the heatmap graph is a structure graph with each bar representing a breed comprised of four to five individuals. The bars are divided into K colors, where K is the number of populations assumed. The length of the colored segment shows the breed’s estimated proportion of membership in that cluster averaged over 20 runs with K = 5. The heatmap graph shows consistency of clustering between breeds across the same 20 runs of structure. (Red blocks) Breeds that cluster together in >80% of runs; (orange) breeds that cluster together in 60%–80% of all runs; (yellow) breeds that cluster in 40%–60% of runs; (light blue) breeds that cluster in 20%–40% of runs; and (dark blue) breeds that cluster in <20% of all runs. Breeds are ordered identically along both the X- and Y-axes of the color map. Order was determined by a dendrogram based on the distances displayed (dendrogram not shown). The names of the breeds are shown to the left of the structure graph and above the heatmap. The four breeds used to map cea are highlighted in yellow. Group names are listed to the right with colored lines indicating the location of the group on the heatmap.
