Habitat structure and population persistence in an experimental community

Stephen P. Ellner (), Edward McCauley, Bruce E. Kendall, Cheryl J. Briggs, Parveiz R. Hosseini, Simon N. Wood, Arne Janssen, Maurice W. Sabelis, Peter Turchin, Roger M. Nisbet and William W. Murdoch
Additional contact information
Stephen P. Ellner: Cornell University
Edward McCauley: University of Calgary
Bruce E. Kendall: Donald Bren School of Environmental Science and Management
Cheryl J. Briggs: University of California
Parveiz R. Hosseini: University of California
Simon N. Wood: School of Mathematical and Computation Sciences, University of St Andrews
Arne Janssen: Institute for Biodiversity and Ecosystem Dynamics
Maurice W. Sabelis: Institute for Biodiversity and Ecosystem Dynamics
Peter Turchin: University of Connecticut
Roger M. Nisbet: University of California
William W. Murdoch: University of California

Nature, 2001, vol. 412, issue 6846, 538-543

Abstract: Abstract Understanding spatial population dynamics is fundamental for many questions in ecology and conservation1,2,3,4. Many theoretical mechanisms have been proposed whereby spatial structure can promote population persistence, in particular for exploiter–victim systems (host–parasite/pathogen, predator–prey) whose interactions are inherently oscillatory and therefore prone to extinction of local populations5,6,7,8,9,10,11. Experiments have confirmed that spatial structure can extend persistence11,12,13,14,15,16, but it has rarely been possible to identify the specific mechanisms involved. Here we use a model-based approach to identify the effects of spatial population processes in experimental systems of bean plants (Phaseolus lunatus), herbivorous mites (Tetranychus urticae) and predatory mites (Phytoseiulus persimilis). On isolated plants, and in a spatially undivided experimental system of 90 plants, prey and predator populations collapsed; however, introducing habitat structure allowed long-term persistence. Using mechanistic models, we determine that spatial population structure did not contribute to persistence, and spatially explicit models are not needed. Rather, habitat structure reduced the success of predators at locating prey outbreaks, allowing between-plant asynchrony of local population cycles due to random colonization events.

Date: 2001
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DOI: 10.1038/35087580

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