Abstract
During the reptile survey in Lithuania, a total of 116 localities of Lacerta agilis and 155 localities of Lacerta (Zootoca) vivipara were mapped. Frequency of occurrence was 40.6% and 54.2%, respectively. Values of Zielinski.s index were considerably higher (53.2% and 69% respectively) if compared with the direct frequency of occurrence. These differences between the species, evident even after the evaluation of the survey effort degree, lead to the suggestion that in Lithuania L. vivipara is more common than L. agilis. However, a more detailed analysis showed that both species have the same status south of approximately 55°17'N, while to the north of this line L. agilis is less common, and its distribution is patchy. This latitudinal gradient in the distribution is probably caused by different tolerance of the species to the same environmental conditions.
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