Figure 5. Historical gene flow among Arabian mangrove populations. Phylogenetic relationships and patterns of historic gene flow among mangrove populations of (A) the Red Sea and (B) the PAG plus the Sea of Oman as computed in TreeMix. Branch lengths represent the amount of genetic drift. Arrows represent inferred migration events, colored according to the proportion of the recipient population’s ancestry that derives from the donor. SE represents the standard error of migration rates. Salalah population from the Arabian Sea was set as root in both analyses.