Phylogeography and conservation of the populations of Zootoca vivipara carniolica

摘要

The lizard Zootoca vivipara has both oviparous and viviparous populations which belong to distinct clades. This study aims to elucidate the geographic distribution, phylogeography and conservation priority of the oviparous subspecies, Zootoca vivipara carniolica, that has recently been identified in Slovenia. We studied seven Slovenian populations, two northeastern Italian populations and five northwestern Italian populations. The seven cytochrome b haplotypes that we identified from the Slovenian and Italian oviparous populations form a monophyletic basal clade. The high homogeneity of the Slovenian and northeastern Italian populations (nucleotide diversity pi = 0.06%) is a striking contrast with the pattern observed in northwest Italy where each of the five populations studied presents a private haplotype (pi = 1.03%). The results obtained suggest that all the extant lineages of Z.v. carniolica have originated in an Italian refuge. The reproductive and phylogenetic distinctiveness of Z.v. carniolica clearly justifies conservation of its populations, especially in Italy where the highest genetic diversity and the most ancestral haplotype were observed.