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1 Polish Journal of Ecology

1 2000

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Variability of helminth assemblages and populations in the bank vole Clethrionomys glareolus

Haukisalmi V., Henttonen H.

Polish Journal of Ecology

2000

Vol. 48, Suppl.

219-231

The present knowledge of the helminth fauna and ecology of helminths in the bank vole Clethrionomys glareolus is reviewed, with special emphasis on the geographical variability of helminth assemblages. The helminth fauna of bank vole is highly predictable throughout its distribution range, with the possible exception of England and Wales. In the latter region, helminth species diversity was lower and species dominance relationships were different, compared with those on the continental regions. The patterns of seasonal and long-term population dynamics of helminths are reviewed, showing that life-cycles do not determine the patterns of seasonal variability of helminth populations. Although some helminth species show patchy spatial distribution in the field, (high) aggregation of helminth species among host population is shown to pe due to differences between host individuals in exposure and/or susceptibility, rather than spatial heterogeneity on a higher scale. Two unpublished experiments show that the ubiquitous helminth species of bank voles, Heligmosomum mixtum (Nematoda), has the potential to act as a mortality factor if the quality of the host diet is poor, but bank vole populations are unlikely to be regulated by this nematode.