DOI: 10.5061/dryad.rk491
title: Data from: A genomic footprint of hybrid zone movement in crested newts

description: Speciation typically involves a stage in which species can still exchange
 genetic material. Interspecific gene flow is facilitated by the hybrid
 zones that such species establish upon secondary contact. If one member of
 a hybridizing species pair displaces the other, their hybrid zone would
 move across the landscape. Although theory predicts that moving hybrid
 zones quickly stagnate, hybrid zones tracked over one or a few decades do
 not always follow such a limitation. This suggests that hybrid zones have
 the potential to traverse considerable distances over extended periods of
 time. When hybrid zones move, introgression is predicted to result in
 biased gene flow of selectively neutral alleles, from the receding species
 into the advancing species. We test for such a genomic footprint of hybrid
 zone movement in a pair of crested newt species (genus Triturus) for which
 we have a priori support for westward hybrid zone movement. We perform a
 multilocus phylogeographical survey and conduct Bayesian clustering
 analysis, estimation of ancestry and heterozygosity, and geographical
 cline analysis. In a 600 km wide area east of the present day hybrid zone
 a genomic footprint constitutes empirical evidence consistent with
 westward hybrid zone movement. The crested newt case suggests that hybrid
 zone movement can occur over an extensive span of time and space.
 Inferring hybrid zone movement provides fundamental insight into
 historical biogeography and the speciation process, and we anticipate that
 hybrid zones will prove to be far more mobile than currently appreciated.
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