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Focuses on the cyclic dynamics of Clethrionomys rufocanus, the gray-sided vole, in the subarctic birch forest at Kilpisjarvi, Finland. Test of statistical hypotheses; Effects of voles in other habitats; Causal interpretations of the statistical results.

Cites regular multiannual fluctuations in abundance of small-rodent community in northern Fennoscadia, Finland. Importance of periodic multiannual fluctuations in the abundance of small rodents in the ecology of many northern regions; Microtine cycle as the occurrence of fluctuations in the abundance of small rodents; Microtine cycle in Europe.