Costs of predator-induced phenotypic plasticity: a graphical model for predicting the contribution of nonconsumptive and consumptive effects of predators on prey
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- 作者：Scott D. Peacor (1)
Barbara L. Peckarsky (2)
Geoffrey C. Trussell (3)
James R. Vonesh (4) - 关键词：Nonlethal effect ; Trait ; mediated ; Phenotypic plasticity ; Nonconsumptive effects ; Prey defensive traits
- 刊名：Oecologia
- 出版年：2013
- 出版时间：January 2013
- 年：2013
- 卷：171
- 期：1
- 页码：1-10
- 全文大小：277KB
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Barbara L. Peckarsky (2)
Geoffrey C. Trussell (3)
James R. Vonesh (4)
1. Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI, 48824, USA
2. Departments of Zoology and Entomology, University of Wisconsin, Madison, WI, 53706, USA
3. Marine Science Center, Northeastern University, 430 Nahant Road, Nahant, MA, 01908, USA
4. Department of Biology, Virginia Commonwealth University, 1000 West Cary Street, P.O. Box 842012, Richmond, VA, 23284, USA - ISSN：1432-1939
文摘
Defensive modifications in prey traits that reduce predation risk can also have negative effects on prey fitness. Such nonconsumptive effects (NCEs) of predators are common, often quite strong, and can even dominate the net effect of predators. We develop an intuitive graphical model to identify and explore the conditions promoting strong NCEs. The model illustrates two conditions necessary and sufficient for large NCEs: (1) trait change has a large cost, and (2) the benefit of reduced predation outweighs the costs, such as reduced growth rate. A corollary condition is that potential predation in the absence of trait change must be large. In fact, the sum total of the consumptive effects (CEs) and NCEs may be any value bounded by the magnitude of the predation rate in the absence of the trait change. The model further illustrates how, depending on the effect of increased trait change on resulting costs and benefits, any combination of strong and weak NCEs and CEs is possible. The model can also be used to examine how changes in environmental factors (e.g., refuge safety) or variation among predator–prey systems (e.g., different benefits of a prey trait change) affect NCEs. Results indicate that simple rules of thumb may not apply; factors that increase the cost of trait change or that increase the degree to which an animal changes a trait, can actually cause smaller (rather than larger) NCEs. We provide examples of how this graphical model can provide important insights for empirical studies from two natural systems. Implementation of this approach will improve our understanding of how and when NCEs are expected to dominate the total effect of predators. Further, application of the models will likely promote a better linkage between experimental and theoretical studies of NCEs, and foster synthesis across systems.