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Density and spatial organisation of reproductive C. glareolus, C. rufocanus and M. agrestis females were studied in a coniferous forest in northern Sweden. Individually marked voles were live-trapped during a five-year period covering two cyclic peak years. During the first peak all three species were abundant, but during the second one only C. glareolus was present. Breeding Clethrionomys females had exclusive ranges both intra- and interspecifically, whereas Microtus females tended to be randomly distributed in relation to both C. glareolus and conspecific females. The individual Clethrionomys females remained fairly site tenacious during the entire breeding season, while Microtus females changed location markedly. The range size of C. glareolus females during breeding was almost four times larger than that of C. rufocanus, while range size of M. agrestis females tended to be intermediate. Both intra- and interspecific competition for space among reproductive females were likely to limit the size of the breeding population of C. glareolus. The results indicated that breeding females of either C. glareolus alone, or the two Clethrionomys spp. together, occupied all space available during peak years.
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