Figure 1.

Genetic Diversity and Differentiation of Swahili and Comoros Populations Relative to Comparative Populations in the Low-SNP-Density Dataset

(A) Principal-component analysis of the low-SNP-density dataset with EIGENSOFT.³⁶ Swahili individuals are represented by squares, Comoros individuals are represented by diamonds, and all other individuals in the comparative dataset are represented by circles.

(B) An EEMS³⁷ gradient map is centered on populations along the East African coast (convergence of 3 × 10⁶ MCMC iterations). The color scale reveals low (blue) to high (orange) genetic barriers between populations localized on a grid of 500 demes. Each dot is proportional to the number of populations included. Red demes represent Swahili and Comoros populations; and green demes represent Middle Eastern, East African, and South African populations in the low SNP-density dataset.