Fig. 2

Admixture analysis of gorilla genomes. Admixture plots showing the ancestry components of gorilla genomes. Admixture proportions were generated through an unsupervised admixture analysis at k = 2 and k = 3 using ADMIXTURE v1.3 and plotted in R v3.2.3. Each individual is represented by a vertical line partitioned into colored segments whose lengths are proportional to the contributions of the ancestral components to the genome of the individual. At k = 2, with lowest cross-validation error, eastern and western gorillas were homogeneously assigned to two distinct clusters. Nyango, the cross-river gorilla, expectedly had high western gorilla ancestral component with small fraction of eastern gorilla ancestry. At k = 3, while the eastern gorillas maintained their genomic integrity, most western gorillas appeared to be genomic admixture of Cameroonian and Congolese ancestral components of varying proportions