Figure 3

Possible Würm glacial distribution patterns (indicated by "R") of the butterfly Erebia medusa and assumed postglacial range changes (arrows). Overlapping refuge symbols or lines between them indicate possible gene flow between them during the last ice age or even a larger structured refuge area (especially in the case of Bulgaria). Redrawn after Schmitt & Seitz [51], Schmitt et al. [50] and Hammouti et al. [53].