@article{2241,
  keywords = {Animals, Models, Genetic, Base Sequence, Molecular Sequence Data, Evolution, Molecular, Genes, Insect, Species Specificity, Sequence Analysis, DNA, Genetics, Population, Polymorphism, Genetic, Bayes Theorem, Time Factors, Chromosomes, Butterflies, Genetic Speciation},
  author = {Andrea Putnam and Mark Scriber and Peter Andolfatto},
  title = {Discordant divergence times among Z-chromosome regions between two ecologically distinct swallowtail butterfly species.},
  abstract = {<p>We investigate multilocus 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.</p>},
  year = {2007},
  journal = {Evolution},
  volume = {61},
  pages = {912-27},
  month = {04/2007},
  language = {eng},
}