Fig. 1.

(a) Geographic location of the silver fir (Abies alba Mill.) populations indicated by a summary of the STRUCTURE results with K = 4. Each pie shows the average coancestry of the sampled, on average, 20 individuals from the 19 populations from the four assumed genetic clusters. Matzendorf indicates the common garden location. Population names are abbreviated using three letter codes; see full names in Table S1. (b) Drift distances between populations as estimated with the admixture F-model (AFM). Coancestry between populations is the mean of the posterior means from 10 independent Markov chains. Distances were calculated from the posterior mean coancestry matrix to draw the dendrogram