Fig. 1

Variation in evolutionary history due to admixture, using American bison as an example. a, b The two different evolutionary histories that are present in the genomes of bison from the Santa Catalina Island herd. c The autosomal tree (gray) with the two different mitochondrial trees superimposed (red and black). Examining autosomal markers, 99.4% of the population is represented by the unintrogressed tree. Examining mitochondrial markers, 55.1% of the population is represented by the unintrogressed tree (black), and 44.9% follow the introgressed tree (red). Data from Hedrick [23]