Fig. 3 in Allopatric divergence and secondary contacts in Euphorbia spinosa L: Influence of climatic changes on the split of the species

Fig. 3 Graphic representation produced on the basis of the ISSR data matrix for E. spinosa. a Plot of grey square individuals by first- and second-principal (30% and 11%) components showing an intermediate position between the samples of the black square = Northwestern group and white square=Southeastern group. b Estimation, by using the software NEWHY- BRIDS (Anderson and Thompson 2002) of the posterior probability that each individual belongs to each of the six genotypic classes that originate after two generations of admixture. The six classes are: two pure lines (black =pure line 1, northwestern group and white = pure line 2, southeastern group), first generation hybrids (F1), second generation hybrids (F2), backcrosses to NW (BC_1); backcrosses to SE (BC_2). The length of each bar reflects the Bayesian posterior probabilities that the 90 analyzed individuals belong to line pure or hybrids. Population abbreviations are explained in Table 1