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Genetic differentiation (FST values) of C. flava, C. viridula and C. × subviridula from three regions of origin, Estonia (EST), Highland (CHH) and Lowland Switzerland (CHL). Dotted blue lines mark intraspecific differentiation between regions, dashed red lines mark interspecific differentiation within regions. Significances of the pairwise FST values were tested using 1000 permutations; all but two comparisons were significant.
