Document Detail


Stronger inducible defences enhance persistence of intraguild prey.
MedLine Citation:
PMID:  20487090     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. Intraguild predation is widespread in nature despite its potentially destabilizing effect on food web dynamics. 2. Anti-predator inducible defences affect both birth and death rates of populations and have the potential to substantially modify food web dynamics and possibly increase persistence of intraguild prey. 3. In a chemostat experiment, we investigated the long-term effects of inducible defences on the dynamics of aquatic microbial food webs consisting of an intraguild predator, intraguild prey, and a basal resource. We controlled environmental conditions and selected strains of intraguild prey that varied in the strength of expressed inducible defences. 4. We found that intraguild prey with a stronger tendency to induce an anti-predator morphology persist for significantly longer periods of time. In addition, model selection analysis implied that flexibility in defensive phenotype (inducibility itself) is most likely the factor responsible for the enhanced persistence. 5. As patterns at the community level often emerge as a result of the life-history traits of individuals, we propose that inducible defences increase the persistence of populations and may contribute to the widespread occurrence of theoretically unstable intraguild predation systems in nature.
Authors:
Pavel Kratina; Edd Hammill; Bradley R Anholt
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-05-18
Journal Detail:
Title:  The Journal of animal ecology     Volume:  79     ISSN:  1365-2656     ISO Abbreviation:  J Anim Ecol     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-16     Completed Date:  2010-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  993-9     Citation Subset:  IM    
Affiliation:
Department of Biology, University of Victoria, PO Box 3020, Victoria, British Columbia V8W 3N5, Canada. kratina@zoology.ubc.ca
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MeSH Terms
Descriptor/Qualifier:
Animals
Euplotes / physiology*
Extinction, Biological
Food Chain*
Population Dynamics
Predatory Behavior / physiology*
Time Factors
Turbellaria / physiology*

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