Journal
EVOLUTION
Volume 61, Issue 4, Pages 912-927Publisher
WILEY
DOI: 10.1111/j.1558-5646.2007.00076.x
Keywords
approximate Bayesian computation; divergence; hybrid zones; introgression; Lepidoptera; Papilio; speciation
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We investigate multi locus patterns of differentiation between parental populations of two swallowtail butterfly species that differ at a number of ecologically important sex-linked traits. Using a new coalescent-based approach, we show that there is significant heterogeneity in estimated divergence times among five Z-linked markers, rejecting a purely allopatric speciation model. We infer that the Z chromosome is a mosaic of regions that differ in the extent of historical gene flow, potentially due to isolating barriers that prevent the introgression of species-specific traits that result in hybrid incompatibilities. Surprisingly, a candidate region for a strong barrier to introgression, Ldh, does not show a significantly deeper divergence time than other markers on the Z chromosome. Our approach can be used to test alternative models of speciation and can potentially assign chronological order to the appearance of factors contributing to reproductive isolation between species.
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