Principal Component Analyses for microsatellite data of all 705 samples (Natrix natrix, N. tessellata). The same dataset was used as for structure analyses. Samples are colored according to their mitochondrial lineage or structure cluster membership; admixed individuals in structure analyses are shown in grey. Thresholds for admixed samples were derived from hybridlab simulations and the same as used for structure. Oval outlines correspond to 95% confidence intervals. PC1 explains 3.96% of variance, PC2 2.13%, and PC3 1.70%. Some snakes morphologically matching N. tessellata are highlighted. The pink arrows denote the only grass snake corresponding to mitochondrial lineage 6 of N. natrix.

 
 
  Part of: Asztalos M, Ayaz D, Bayrakcı Y, Afsar M, Tok CV, Kindler C, Jablonski D, Fritz U (2021) It takes two to tango – Phylogeography, taxonomy and hybridization in grass snakes and dice snakes (Serpentes: Natricidae: Natrix natrix, N. tessellata). Vertebrate Zoology 71: 813-834. https://doi.org/10.3897/vz.71.e76453