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Sex Chromosome Mosaicism and Hybrid Speciation among Tiger Swallowtail Butterflies

Figure 6

Estimated gene flow among appalachiensis, glaucus, and canadensis.

Gene flow was estimated as the population migration rate or 2Nm, which is equivalent to the historical average number of immigrants between species per generation: glaucus to appalachiensis: 2.3; canadensis to appalachiensis: 1.8; appalachiensis to either glaucus or canadensis: 0; glaucus to canadensis: 0.1; canadensis to glaucus: 0.

Figure 6