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Population oscillations of boreal rodents: regulation by mustelid predators leads to chaos

Nature volume 364, pages 232–235 (1993)Cite this article

Abstract

THE four-year cycle of microtine rodents in boreal and arctic regions was first described in 1924 (ref. 1). Competing hypotheses on the mechanisms underlying the small mammal cycle have been extensively tested2–5, but so far the sustained rodent oscillations are unexplained. Here we use two mutually supportive approaches to investigate this question. First, building on studies of the interaction between rodents and their mustelid predators6–9, we construct a predator–prey model with seasonality. Second, we use a new technique of nonlinear analysis10,11 to examine empirical time-series data, and compare them with the model dynamics. The model parameterized with field data predicts dynamics that closely resemble the observed dynamics of boreal rodent populations. Both the predicted and observed dynamics are chaotic, albeit with a statistically significant periodic component. Our results suggest that the multiannual oscillations of rodent populations in Fennoscandia are due to delayed density dependence imposed by mustelid predators, and are chaotic.

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Author information

Authors and Affiliations

  1. Department of Zoology, Division of Ecology, University of Helsinki, PO Box 17, (P. Rautatiekatu 13), SF-00014, Finland

    Ilkka Hanski

  2. Southern Forest Experiment Station, 2500 Shreveport Highway, Pineville, Louisiana, 71360, USA

    Peter Turchin

  3. Laboratory of Ecological Zoology, Department of Biology, University of Turku, SF-20500, Turku, Finland

    Erkki Korpimäki

  4. Department of Forest Ecology, Finnish Forest Research Unit, PO Box 18, SF-01301, Vantaa, Finland

    Heikki Henttonen

Authors
  1. Ilkka Hanski
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  2. Peter Turchin
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  3. Erkki Korpimäki
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  4. Heikki Henttonen
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Hanski, I., Turchin, P., Korpimäki, E. et al. Population oscillations of boreal rodents: regulation by mustelid predators leads to chaos. Nature 364, 232–235 (1993). https://doi.org/10.1038/364232a0

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