Long-term dynamics of the bank vole Clethrionomys glareolus at Pallasjärvi, northern Finnish taiga

Henttonen, Heikki

doi:ISSN 1505-2249

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Tytuł: Long-term dynamics of the bank vole Clethrionomys glareolus at Pallasjärvi, northern Finnish taiga

Abstrakt:

The whole rodent community (eight arvicoline species) has been followed at Pallasjärvi. at the northern limit of Clethrionomys glareolus in Finnish Lapland, since 1970. Dynamics were cyclic until the mid 1980's, but since then the pattern has been stable. Also the species abundances have changed. The delayed density dependence, characterising the cyclic period, is not found during the stable period. Causes for this change in cyclicity are discussed. The bank vole is the most common rodent species in forests up to its northern limit. The long-term, year around live trapping studies and feeding experiments suggest e.g. that delayed maturation of young is not optimal but due to social constraints. Food addition resulted in higher densities, but the effect on the density-dependent structure was negligible and the dynamics were not affected by food addition.

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