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Reproductive investment under fluctuating predation risk: Microtine rodents and small mustelids

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Summary

We studied the reproductive investment of microtine rodents (bank vole (Clethrionomys glareolus),Microtus epiroticus andMicrotus agrestis) in western Finland under predation risk from small mustelids. During 1984–1992, the yearly mean litter size of overwintered bank voles was smaller at high least weasel and stoat densities than at low densities (close to 3 versus 4–5). In addition, the annual mean litter size of young bank voles was negatively correlated to the least weasel density. In youngM. agrestis voles, the yearly late summer litter size was negatively associated with the autumn density of small mustelids. In the crash phase of the vole cycle (1989 and 1992), we removed small mustelids (mainly least weasels) from four unfenced areas in late April to late May and studied the reproduction of voles in four removal and comparable control areas (each 2–4 km2). Reduction of small mustelids significantly increased the proportion of pregnant bank vole females, but not that of pregnantMicrotus vole females. We conclude that predation risk apparently reduced reproductive investment of free-living bank vole females; these voles appear to trade their current parental investment against future survival and reproductive prospects. Accordingly, the presence of small mustelids (or their scent) may slow down the reproductive rate of voles. As antipredatory behaviours occurred on a large scale, our results add evidence to the hypothesis that crashes in multiannual vole cycles are driven by small mustelid predators.

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Authors and Affiliations

  1. Laboratory of Ecological Zoology, Department of Biology, University of Turku, FIN-20500, Turku, Finland

    Erkki Korpimaki & Jari Valkama

  2. Department of Zoology, Division of Ecology, University of Helsinki, PO Box 17, FIN-00014, Helsinki, Finland

    Kai Norrdahl

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  1. Erkki Korpimaki
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  2. Kai Norrdahl
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Korpimaki, E., Norrdahl, K. & Valkama, J. Reproductive investment under fluctuating predation risk: Microtine rodents and small mustelids. Evol Ecol 8, 357–368 (1994). https://doi.org/10.1007/BF01238188

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