Quaternary radiation of bifid toadflaxes (Linaria sect. Versicolores) in the Iberian Peninsula: low taxonomic signal but high geographic structure of plastid DNA lineages

摘要: Phylogeographic analysis provides insights into the micro-evolutionary mechanisms driving recent radiations. Here we conducted a phylogeographic of Iberian clade Linaria subsect. Versicolores. This lineage includes eight species and subspecies endemic or subendemic to Peninsula that diversified in Quaternary. We obtained 159 sequences three plastid DNA regions from 53 individuals study group representing all recognized taxa. Phylogenetic, haplotype network, dating population genetic analyses were conducted. In addition, radiation hypothesis (common ancestry rapid speciation) was tested. The results revealed two major clades diverged Pleistocene. Low taxonomic signal found as result diversification. Indeed, is herein described an evolutionary because its common diversification rates line with those other plant Interestingly, high geographic structure lineages revealed, discontinuity separating south-eastern populations rest Iberia. Based on results, rule out marine barrier cause behind this discontinuity, hypothesize role edaphic specialization differentiation clades. These provide relevant information dynamics radiations western Mediterranean hotspot.