Food resources and population density are key factors influencing spatiosocial organisation. We compared the space use of two dormiceGlis glis (Linnaeus, 1766) populations differing in density, one high and the other low, in a breeding year 2002 (when trees masted) and in a non-breeding year 2001 (with reproductive failure and a total lack of mast). In the low-density population males always had larger home ranges and travelled longer distances than females. In the high-density population such differences between sexes became significant only in the breeding year. Home ranges and distances travelled each night were larger in the low-density population, but only for males.
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