The egg-laying subspecies of viviparous lizard Zootoca vivipara carniolica was first described in Slovenia was thought to be the only subspecies present in the area. However, none of previous studies explored populations above 1200 m a.s.l. In this thesis we searched for the presence of viviparous subspecies Zootoca vivipara vivipara in Slovenia and for the morphological tratis that would warrant identification of subspecies in the field. We studied five regions, and confirmed the presence of the nominal subspecies Z. v. vivipara on Pohorje in NE part of Slovenia. In the same region, albeit on lower altitudes, lives also egg-laying subspecies Z. v. carniolica. We assume that the region presents a contact zone between both subspecies. We found no reliable morphological characteristics for suspsecies identification; potentially useful is the coloration of female belly, yellow, orange or pale in nominal and only pale in egg laying subspecies.
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