Posterior probability distributions from IMa [45] for gene flow between blue-footed and Peruvian boobies for the total, autosomal, and z-linked datasets.

Gene flow parameters m₁ and m₂ scaled by the mutation rate. 2Nm  =  population migration rate per generation. A) Gene flow from Peruvian boobies to blue-footed boobies (m₁). B) Gene flow from blue-footed boobies to Peruvian boobies (m₂).