A comparison of the dynamical impact of seasonal mechanisms in a herbivore–plant defence system

Theoretical Ecology - Tập 6 - Trang 225-239 - 2012
Jennifer J. H. Reynolds1, Jonathan A. Sherratt1, Andrew White1, Xavier Lambin2
1Department of Mathematics and the Maxwell Institute for Mathematical Sciences, Heriot-Watt University, Edinburgh, UK
2School of Biological Sciences, Zoology Building, University of Aberdeen, Aberdeen, UK

Tóm tắt

Plant defences can reduce herbivore fitness and may promote cycles in some herbivore populations. In this study, we model the interaction between plant defences and herbivores and include seasonal forcing, a ubiquitous environmental influence in natural systems. We compare the impacts of two different seasonal mechanisms on the dynamics of the herbivore–plant defence system. The first mechanism involves a fixed breeding season length and a variable birth rate within the breeding season; the second involves a variable breeding season length and a fixed birth rate within the breeding season. When parameterised for a specific cyclic system, namely field voles and silica, our model predicts that a variable season length gives multi-year cycles for a larger region in parameter space than a variable birth rate. Our results highlight the complexity of the dynamical effects of seasonal forcing and that these effects are strongly dependent on the type of seasonal mechanism.

Tài liệu tham khảo

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