Fig. 1From: Genetic diversity of calcareous grassland plant species depends on historical landscape configurationGeographic location of the 18 selected study sites (labelled dots) in the valleys of Naab and Laber on the Franconian Alb in south eastern Germany near Regensburg and all other calcareous grasslands (grey areas) within a radius of 3 km around the study sites in 1830 and 2013Back to article page