Figure 3
Population admixture events and inferred contact dates. Admixture events between genetic clusters obtained using fineSTRUCTURE37 (FS, Supplementary Fig. S6) and estimated with GLOBETROTTER38 (GT, Supplementary Table S8) for the Leeward Society Isles group. Each color represents a separate genetic cluster estimated with FS that acts as a donor to the recipient cluster (Leeward Society Isles) in the GT analysis. These donor groups are: Europe, East Asia, Malaysia, northern Melanesia (Bougainville), Philippines (‘Philippine 1’ cluster in FS), New Guinea and Sulawesi. ‘Other’ represents an amalgamation of groups contributing less than 3% ancestry to the admixture episodes in the genomes of Leeward Society Islanders. There is strong statistical support for two episodes of admixture; the ancient and recent events are represented by the left- and right-hand bar plots, respectively. Each episode involves two pairs of sources (minor and major); bar plots depict the inferred composition of the mixing sources for each, with admixture dates calculated using a generation time of 28 years. The dates for the older episode are given in the format of Common Era (CE) and Before Present (BP) for convenience. Detailed information about the inferred admixture episodes and composition of mixing sources is given in Supplementary Table S8.
