Fig. 3.

Haplotype networks constructed with nuclear DNA. The colours represent lineages detected by mitochondrial DNA analysis. For both genes, the gametic phase of heterozygous individuals was determined using Phase 2.1 [38, 39], then an unrooted minimum-spanning networks were constructed with median-joining algorithm [32] implemented in Network 5.1 (www.fluxus-engineering.com) with default settings. Figure 3a Rhodopsin haplotype network was constructed from 782 base pair long phased alignment. Figure 3b Recombination activating gene 1 (RAG1) haplotype network was constructed using 1413 base pair long phased alignment. The arrows denote areas, where hybrids were detected and correspond to Fig. 1