Fig. 4

Exploratory analyses showing genomic patterns of differentiation among P. adscitus and P. eximius individuals as a (a) STRUCTURE plot assuming two ‘populations’ (black box delimits individuals found within the described hybrid zone and the surrounding region), with samples arranged latitudinally from south (P. eximius) to north (P. adscitus) (left to right), and as a (b) PCA plot (yellow squares: P. adscitus, red diamonds: P. eximius, and orange triangles: individuals within or around the described hybrid zone). Both plots are based on 1945 single SNP loci, and assuming two ‘populations’