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1 Polish Journal of Ecology

1 2000

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Geographical differences in size, reproduction and behaviour of bank voles in relation to density variations

Yoccoz N., Hansson L., Ims R.

Polish Journal of Ecology

2000

Vol. 48, Suppl.

63-72

The bank vole in Europe is hardly genetically differentiated, except in northern Fennoscandia, but shows large phenotypic variation. Body weight has been studied in the field and in the laboratory. Large bank voles are known in northern cyclic populations found on islands and in alpine areas. Reproductive patterns show that the length of the breeding season and the maturation processes may be more influenced by the fluctuation patterns than the length of the vegetative period. Behavioural differences are also known to occur between individuals from northern cyclic populations and individuals from southern stable populations. The relative importance of density fluctuations patterns and environmental harshness in causing geographical variation patterns is not known.