Mitochondrial identity of genetically studied samples (n = 1062). A Entire study range, B Rhine transect, C Alpine transect, D Italian transect. In cline analyses, the transition between mtDNA lineages corresponding to Natrix helvetica (mtDNA lineages C and E) or N. natrix (mtDNA lineages 3 and 4) were used. Data are from Kindler et al. (2013, 2014, 2017), Kindler and Fritz (2018), Glaw et al. (2019), Schultze et al. (2019, 2020), and Asztalos et al. (2021a).

 
 
  Part of: Fritz U, Grismer LL, Asztalos M (2023) Hybrid zones of Natrix helvetica and N. natrix: Phenotype data from iNaturalist and genetics reveal concordant clines and the value of species-diagnostic morphological traits. Vertebrate Zoology 73: 383-395. https://doi.org/10.3897/vz.73.e103319