“…In agreement with structure and faststructure results for K = 2, all phylogenetic analyses showed a basal split in two clades corresponding to populations located east and west of an imaginary line located around the Segre river (~1°E). Similar east–west genetic splits have been reported for many other plant and animal species from the Pyrenean region (e.g., Alvarez‐Presas, Mateos, Vila‐Farre, Sluys, & Riutort, ; Bidegaray‐Batista et al, ; Charrier, Dupont, Pornon, & Escaravage, ; Milá, Carranza, Guillaume, & Clobert, ; Valbuena‐Ureña et al, ). This east–west split might be well explained by detailed geological reconstructions documenting heavily glaciated areas in the central part of the range and the likely presence of ice‐free refugia at its longitudinal extremes (Ehlers, Gibbard, & Hugues, ) that might have allowed montane/alpine species to survive glaciations and recolonize high elevations during interglacial periods (Charrier et al, ; Valbuena‐Ureña et al, ).…”