Fig. 2: Contrasted population genetic structure in the highly dispersive species (A. alosa) compared to the less dispersive species (A. fallax).

A Bayesian individual clustering performed with Structure for each species separately. In A. alosa K = 3 and K = 6 clusters are identified according to the Ln(K) and ΔK methods presented in Fig S2. B In A. fallax 3 and 5 clusters are identified according to the Ln(K) and ΔK methods presented in Fig S2. Individuals are represented by a bar with each color representing its membership proportion to each cluster. C plot of the Discriminant Analysis of Principal Components (DAPC) performed in A. alosa. The “best” number of clusters was inferred using the Bayesian Information Criteria (BIC) (Fig S3). Clusters are numbered from one to six given that mixed membership probability was often attributed to different rivers. Membership assignment of individuals averaged by river to each cluster can be found in (Table S8). D Plot of the DAPC performed in A. fallax. Membership assignment of individuals averaged by river to each cluster can be found in (Table S9).