Periodic Fluctuations in Small Mammals at Boda, Sweden from 1961 to 1988

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Abstract
From 1961 to 1988 small mammals were censused n four trap lines at the Boda Research Station in central Sweden. Clethrionomys glareolus was the dominent small mammal, comprising 85% of the total catch of 1955 small rodents. Clethrionomys glareolus fluctuated cyclically with peaks averaging 3.6 years apart over the 28 years of the study and an average amplitude of 55-fold. Microtus agrestis and Apodemus flavicollis, although much less common, showed cyclic flucutations in close synchorny with Clethrionomys glareolus. Sorex araneus was much more common in the Boda area in the 1960s than it is today, but it also has fluctuated in synchrony with the Clethrionomys cycle. Clethrionomys glareolus showed the Chitty Effect of increased body weights of adults in the peak density years.