Figure 2

Gene trees generated according to the demographic models under each of three migration scenarios. Gene trees are plotted atop one another so that patterns of variation among loci are visible. ( a ) No migration; ( b ) low taurine–indicine gene flow; and ( c ) low taurine–indicine gene flow, plus higher recent indicine to Africa gene flow. Figure created using the Densitree function [78] in the phangorn package [79] of R [57].