Fig. 5

Geneland population clustering across space derived from SSR-GBAS data of C. calyculata samples from the Canary Islands. (A) Map of posterior probabilities of population membership. The spatial location of genetic discontinuities are provided (i.e. genetic boundary between the two populations). Each panel shows Geneland maps of the study area with the relative posterior probability of belonging to the 6 different clusters (K = 6 inferred as optimal). Black dots represent the geographical position of the sampled locations. The lighter colouration reflects a higher posterior probability of membership to the different clusters whilst the darker reflects the lowest. (B) Synthetic map of the mode of the posterior probability distribution for each pixel belonging to each inferred population. Black dots represent the geographical position of the sampled locations. (C) Trace of number of populations along the MCMC run with variable number of classes and histogram of simulated values. This run displays a clear mode at K = 6 which is hence the maximum a posteriori estimate of K