Fig. 2

Principle component analysis of canids and linkage disequilibrium across populations. a PCA results for the first two PCs were plotted here for 1237 canids. The percentage of variances explained by the two PCs are also shown. Different symbols corresponding to different populations are shown in the legend (* marks sequenced samples in this study). b PCA analysis of group 1 dogs. The percentage of variances explained by the PCs and the symbols are shown similar to panel a. In the legend, * marks sequenced samples in this work. c Linkage disequilibrium of the gray wolves, group 1 dogs as well as other dogs are plotted as boxplots. Six wolf populations, eight group 1 dog populations as well as 66 other dog populations are shown in this figure. Chow Chow is shown as an asterisk. The Y axis (the H statistic) is the numerical measurement of linkage disequilibrium across a 500 kb window (see Methods)