Data from: Molecular evidence of introgression between water frog species (Anura: Telmatobiidae) in the high Andes

Contact zones are classical natural laboratories to study speciation.
Several evolutionary outcomes are expected from hybridization depending on
the degree of reproductive isolation, ranging from the formation of hybrid
swarms in early stages of speciation to the reinforcement of species
differences when speciation is complete. The genus Telmatobius is a high
Andean, diverse, but poorly known group of neotropical frogs. Although
hybridization between diverged species is frequent in amphibians, it has
not been observed in this group. Here, we studied hybridization processes
among three neighboring Telmatobius species that inhabit different
altitudes in the same desertic basin using nuDNA SNP and mitochondrial DNA
data. The results suggest that the Chilean population of Telmatobius
peruvianus has hybridized to different degrees with the species T. pefauri
and T. marmoratus. We detected mitochondrial and nuclear introgression
from T. peruvianus to T. pefauri and what appears to be historical
introgression between T. marmoratus and T. peruvianus. No first-generation
hybrids nor parental genotypes were detected in admixed localities,
suggesting that the inferred hybridization processes did not occur
recently and several generations of backcrossing have passed in
geographical isolation. Instead of representing stable hybrid zones,
hybrid populations show a degree of genetic differentiation from parental
populations. In this group of amphibians, nearly 2 million years of
allopatric divergence have not been enough to develop reproductive
isolation between diverged species. Data used in the genetic analyses of
Fibla et al. (2025) are provided. These include: a genlight file (nuDNA
SNPs matrix) including all samples, two separate genlight files (nuDNA
SNPs matrices) representing both parental schemes and a fasta file
consisting of D-loop DNA sequences matrix.