Fractions of disrupting recombination events that occur in lineages ancestral to members of the outgroup clade in ARGs, from complex coalescent simulations.

Observed fractions of disrupting recombination events in lineages ancestral to members of the outgroup clade, from simulated genomic data for a hypothetical population with five populations (labeled #1–#5). Each row reports analyses of genomic regions in which the indicated population of sample size occupied an outgroup position in the inferred genealogy, where the total tree comprised sequences in each case. Across all such regions was tabulated the frequency with which boundaries of the regions were defined by recombination events occurring in lineages ancestral to the same outgroup population. Genomic data was simulated under two models: (i) a symmetric five-island structured coalescent model with , and (ii) a model in which again between the five populations, but also with an admixture event into population #1 from an otherwise isolated and unsampled sixth population. In both models the populations revert to a completely panmictic metapopulation beyond generations ago.