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ORIGINAL ARTICLE doi:10.1111/j.1558-5646.2007.00076.x
 

Summary: ORIGINAL ARTICLE
doi:10.1111/j.1558-5646.2007.00076.x
DISCORDANT DIVERGENCE TIMES AMONG
Z-CHROMOSOME REGIONS BETWEEN TWO
ECOLOGICALLY DISTINCT SWALLOWTAIL
BUTTERFLY SPECIES
Andrea S. Putnam,1,2
J. Mark Scriber,3
and Peter Andolfatto1
1Section of Ecology, Behavior, and Evolution, Division of Biological Sciences, University of California, San Diego, La Jolla,
California 92093
2E-mail: asputnam@biomail.ucsd.edu
3Department of Entomology, Michigan State University, East Lansing, Michigan 48824
Received July 27, 2006
Accepted December 2, 2006
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

  

Source: Andolfatto, Peter - Department of Ecology and Evolutionary Biology, Princeton University

 

Collections: Biology and Medicine