Habitat selection at the sand lizard (Lacerta agilis): ontogenetic shifts

Abstract. Ontogenetic shifts at lizards ’ microhabitat selection were studied using sand lizard (Lacerta agilis) as model organism. Field observations evidenced that sightings of hatchling lizards followed the distribution of microhabitat categories while yearlings and adults showed a more active perch selection. However, multivariate analysis evidenced active selection at all age categories. Genuine ontogenetic shifts in habitat selection were recorded with most outstanding differences between hatchlings and yearlings. Lizards ’ perching sites were significantly more homogenous than randomly selected control spots. Microhabitat characteristics measured at adults and yearlings were similar and differed significantly from those measured in the case of hatchlings. Multivariate analyses offered more detailed picture about lizards habitat use and proved to be more sensitive than the traditional goodness-of-fit tests.