Fig.6

a. Scatter plot of the first two principal components with all variables, showing distribution of samples along the gradient of salinity going from left to right. b. Three main principal components represented in a 3D plot through showing distances per treatment among both populations. I: Inowrocław, C: Ciechocinek, 0, 200, 400, 800 and 1000 indicate the concentrations in mM of NaCl, and PC the corresponding principal component. c. Dendrogram representing the relationships between Inowrocław (I) and Ciechocinek (C) populations of S. europaea by random amplified polymorphic DNA analysis (individuals numbered 1–30). Three groups were identified (I, II and III). Jaccard coefficient and UPGMA methods were used