Fig. 4
Genetic clusters found by STRUCTURE for a the simulated hybrid-classes and b the 16 sampled populations. Each individual is represented by a single vertical line, divided into K colours (K = 2; Ch. montanus: green; Ch. parallelus: red); the coloured segment shows the individual’s estimated proportion of membership to that genetic cluster; abbreviations correspond to a the simulated hybrid-classes and to b the 16 sampled populations. The STRUCTURE run was performed with 105 MCMC and a burn-in period of 104 chains (with 10 iterations for each K). Populations O and A. were allotopic populations of Ch. montanus, B and Hust. were allotopic populations of Ch. parallelus