Fig. 2

Population structure and relationships of P. univalens from horse, zebra and donkey. a PCA plots of the first three components. The fraction of the variance explained was 12.75% for PC1, 7.09% for PC2 and 0.06% for PC3; (b) Phylogenetic tree (ML tree with 1000 bootstraps) of all samples inferred from whole-genome tag SNPs, with B. schroederi as an outgroup; (c) Population structure plots with K = 2–4. The y axis quantifies the proportion of the individual’s genome from inferred ancestral populations, and x axis shows the different populations