The spatial and temporal distribution pattern of the stoat (Mustela erminea L.).

The distribution and movements of two stoat populations were studied by capture-recapture and tracking in the Swiss Jura Mountains. On the Brévine area in summer 1977 the population was at a high density phase and evenly distributed. A well established intrasexual territorial system was observed, with a high degree of sedentarity in adults. During the decline and the following phase of scarcity, the stoats were progressively restricted to a peat-bog area and the territorial system broke down. The adult males became transient and a high degree of dispersal was recorded among the juveniles. On the Val de Ruz area, the population was fairly stable and the stoats had home ranges and movements adapted to habitat characteristics. Adult males in March-April and juveniles moved around considerably. These aspects of the spatio-temporal distribution pattern of Mustela erminea are discussed in relation to the main factors affecting it, such as population density, habitat, sex and age, activity, and seasons.