Origin and dynamics of KSxKE hybrid zones
Our molecular data provide several additional perspectives on the KSxKE
hybrid zones. Consistent with geographic expectations, stepwise PCoA of
the SNPs dataset consistently identified the Condamine (ie. taxon
KEm) as the most likely source population for the KE+
parent (Figs. 3b, S1). Second, individuals displayed varying degrees of
admixture between their two parental taxa (Fig. S1), indicating that
F1 hybrids must be sufficiently fertile to at least
produce F2 and/or backcross offspring. Finally, there
was no obvious correlation between the distance from the
KEm source and the extent of introgression for
KE-derived alleles (Figs. 1, S1).