Figure 2.

IBD Sharing between the Americas and Atlantic Africa versus Documented Counts of Deportation

(A) Comparison between the number of enslaved people embarking out of each region of Atlantic Africa to the mean shared IBD (_msIBD; cM) between each Atlantic Africa region and all individuals in the Americas.

(B) _msIBD between regions of Africa and of the Americas (top) and the estimated proportions of enslaved disembarkation into each region of the Americas (bottom). p values indicate significant correlations between _msIBD and disembarkation based on a permutation test using Spearman’s coefficient of correlation. Numbers right of the region labels indicate the mean number (±STD) of _mcIBD connections (≥5 cM) an individual representing that region of the Americas has to the seven primary slave trading regions.

(C) Posterior distributions of the estimated TMRCA of IBD segments during the transatlantic slave trade between each Africa region and all of the Americas.

(D) The proportion of disembarkation of each Atlantic Africa region into the Americas over time, according to historical documents. All Atlantic Africa regions correspond to the colors in key in (A). _msIBD is the total, cumulative IBD shared between two populations (cM), divided by the total pairwise comparisons between two populations.