engleski

A transgression zone of two Podarcis sicula types (Lacertidae) in Istria (Croatia)

Based on cytochrome - b sequences there are two different haplotype forms among the Italian Wall Lizard, Podarcis sicula campestris, within the Adriatic part of its area. On the Dalmatian islands only the "Adriatic" form occurs while in north - eastern Italy the "Veneto" form is found. We were able to discriminate between the two forms by an additional feature, the presence ("Adria" type) or absence ("Veneto" type) of a nuclear copy of a part of the mitochondrial DNA (numt). In western Istria and on the off - shore islands both forms occur. On the islands more distant from the mainland exclusively the "Veneto" type occurs whereas on the islands closer to the coast a mixture or only the "Adria" type was found. In Istria itself bothforms intergrade. The pattern of both features can be interpreted by two postglacial immigration waves, the first one from the west by the Veneto type at the time when all islands were still connected with the mainland and the second one by the "Adria" type later, probably by an over - water colonisation from the south.

Podarcis sicula; Istria; postglacial immigration; hybridisation; cyt - b; numt

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