Heterogeneous landscapes and the role of refuge on the population dynamics of a specialist predator and its prey

Ylönen, H, Pech, R and Davis, S 2003, 'Heterogeneous landscapes and the role of refuge on the population dynamics of a specialist predator and its prey', Evolutionary Ecology, vol. 17, no. 4, pp. 349-369.


Document type: Journal Article
Collection: Journal Articles

Title Heterogeneous landscapes and the role of refuge on the population dynamics of a specialist predator and its prey
Author(s) Ylönen, H
Pech, R
Davis, S
Year 2003
Journal name Evolutionary Ecology
Volume number 17
Issue number 4
Start page 349
End page 369
Total pages 21
Publisher Springer Netherlands
Abstract How, and where, a prey species survives predation by a specialist predator during low phases of population fluctuations or a cycle, and how the increase phase of prey population is initiated, are much-debated questions in population and theoretical ecology. The persistence of the prey species could be due mainly to habitats that act as refuges from predation and/or due to anti-predatory behaviour of individuals. We present models for the former conjecture in two (and three) habitat systems with a specialist predator and its favoured prey. The model is based on dispersal of prey between habitats with high reproductive output but high risk of predation, and less productive habitats with relatively low risk of predation. We illustrate the predictions of our model using parameters from one of the most intriguing vertebrate predator–prey systems, the multi-annual population cycles of boreal voles and their predators. We suggest that cyclic population dynamics could result from a sequence of extinction and re–colonization events. Field voles (Microtus agrestis), a key vole species in the system, can be hunted to extinction in their preferred meadow habitat, but persist in sub-optimal wet habitats where their main predator, the least weasel (Mustela nivalis nivalis) has a low hunting efficiency. Re–colonization of favourable habitats would occur after the predator population crashes. At the local scale, the model suggests that the periodicity and amplitude of population cycles can be strongly influenced by the relative availability of risky and safe habitats for the prey. Furthermore, factors like intra-guild predation may lead to reduced predation pressure on field voles in sub-optimal habitats, which would act as a refuge for voles during the low phase of their population cycles. Elasticity analysis suggested that our model is quite robust to changes in most parameters but sensitive to changes in the population dynamics of field voles in the optimal grassland habitat, and to the maximum predation rate of weasels.
Keyword(s) field vole
functional response
habitat selection
least weasel
predation
refuge
specialist
DOI - identifier 10.1023/A:1027390600748
Copyright notice © 2003 Kluwer Academic Publishers
ISSN 0269-7653
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