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Figure 4 | BMC Evolutionary Biology

Figure 4

From: Distinguishing migration from isolation using genes with intragenic recombination: detecting introgression in the Drosophila simulans species complex

Figure 4

Effect of unequal population size on the detection of unidirectional gene flow (isolation with unequal population size as null model). 1,000 coalescent simulations were performed for each value of the parameter θ2 and each model: isolation (black), migration (red) and unidirectional migration (blue). Continuous lines indicate the proportion of significant tests under the models with migration from P2 to P1 (Wx1s2 statistic) or from P1 to P2 (Wx2s1 statistic), i.e. they indicate the power of the test. Dotted lines indicate the proportion of significant tests under the models without migration from P2 to P1 (Wx1s2 statistic) or from P1 to P2 (Wx2s1 statistic), i.e. they indicate the false positive rate. Proportion of significant tests is estimated as a function of population size ratios between P2 and P1. A. W x1s2 statistic, B. W x2s1 Statistic.

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