Microhabitat use by Cnemidophorus vacariensis (Squamata: Teiidae) in the grasslands of the Araucaria Plateau, Rio Grande do Sul, Brazil

Caruccio, RodrigoC. Vieira, RenataVerrastro, Laura

Microhabitat use by Cnemidophorus vacariensis Feltrim & Lema, 2000 as studied between October 2006 and September 2007 in two rocky formations in the municipality of Bom Jesus. The area was searched randomly between 8:00 am and 6:00 pm and the microhabitat used by the lizards was recorded. Our observations revealed that C. vacariensis has terrestrial habits and prefers open areas. Burrows are the main microhabitat used by the species (56.38%). When in activity, 54.76% of the individuals were observed under rocks, and 38.1% on the ground where herbaceous vegetation was present. The rocks under which they constructed their burrows were on average significantly thicker during warmer seasons temperatures (x¯ = 13,45cm) with respect to colder seasons (x¯ = 9,85cm). The rocks selected by the adults (x¯ = 12.94 cm) were on average significantly thicker than those selected by the juveniles (x¯ = 9.86cm). There were no statistically significant differences between sexes with respect to rock thickness.

1. thermoregulation
2. rocks
3. Burrows
4. shelter