Two species of rock lizards, the parthenogenetic D. dahli and the sexually reproducing D. portschinskii, coexist in a rocky outcrop in an area of ca. 1 ha, in the vicinity of Tbilisi, Georgia; the location has been well-known since the middle 1960s. The population density of the parthenogenetic lizard is five times higher than that of the sexual breeder. We studied the distribution of active lizards in space and time over three consecutive years, during the spring and autumn activity periods, to explore spatial and temporal differences between the species on a fine spatial scale. We studied the influence of temperature, humidity, and quantitative characteristics of the surface and the distance from permanent water source on the spatial distribution of D. dahli and D. portschinskii. Darevskia portschinskii was less dependent on the distance from the water source and more evenly distributed in space and time than D. dahli. Despite potential competitive interactions, the species did not avoid each other on the microhabitat scale, suggesting that the observed ecological differences are not caused by a niche shift. More individuals of the sexual breeder than individuals of the parthenogen were found in suboptimal habitats. This feature may increase the evolutionary success of D. portschinskii in a long-term perspective.

中文翻译：

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库拉蜥蜴（Darevskia portschinskii）及其子代孤雌生殖形式（Darevskia dahli）对栖息地占用的精细分析

两种岩石蜥蜴，单性生殖的D. dahli和有性生殖的D. portchinskii，共存于大约一个地区的岩石露头中。1公顷，乔治亚州第比利斯附近；自1960年代中期以来，该位置就广为人知。单性生殖蜥蜴的种群密度是有性繁殖者的五倍。我们研究了春季和秋季活动期间连续三年的活动蜥蜴在空间和时间上的分布，以在精细的空间尺度上探索物种之间的时空差异。我们研究了温度，湿度，表面定量特征以及距永久水源的距离对D. dahli和D. portschinskii的空间分布的影响。Darevskia portschinskii与D. dahli相比，对水源距离的依赖性较小，并且在空间和时间上的分布更为均匀。尽管存在潜在的竞争性相互作用，但该物种在微生境规模上并没有彼此避免，这表明观察到的生态差异并不是由生态位转移引起的。在次优栖息地中发现的性育种个体比孤雌生殖个体更多。从长远的角度来看，此功能可能会增加Portschinskii的进化成功。在次优栖息地中发现的性育种个体比孤雌生殖个体更多。从长远的角度来看，此功能可能会增加Portschinskii的进化成功。在次优栖息地中发现的性育种个体比孤雌生殖个体更多。从长远的角度来看，此功能可能会增加Portschinskii的进化成功。