The den system of the Alpine marmot (Marmota m. m.) in the National Park of Stelvio, northern Italy [Le système de terriers de la marmotte alpine (M. m. marmota) du Parc National de Stelvio, Italie du nord].

Résumé

Studied the den system of the Alpine marmot which consisted of a variable number of chambers, the principal one being lined with thick litter, with opening and tunnels that linked them wich the outer surroundings. Opening were divided into four types which differed in their use and location within the animal's home range. A qualitative and quantitative analysis of the den system showed a positive correlation between the slope and the opening's orientation, the gradient of the first 30 cm of the tunnel differed between the principal and secondary openings. Exposure to wind was suggested as the main factor affecting the non -random arrangement of the openings.