Document Detail

Size-dependent interactions inhibit coexistence in intraguild predation systems with life-history omnivory.
MedLine Citation:
PMID:  16874615     Owner:  NLM     Status:  MEDLINE    
Growth in body size during ontogeny often results in changes in diet, leading to life-history omnivory. In addition, growth is often dependent on food density. Using a physiologically structured population model, we investigated the effects of these two aspects of individual growth in a system consisting of two size-structured populations, an omnivorous top predator and an intermediate consumer. With a single shared resource for both populations, we found that life-history omnivory decreases the likelihood of coexistence between top predator and intermediate consumer in this intraguild predation (IGP) system. This result contrasts with previous unstructured models and stage-structured models without food-dependent development. Food-dependent development and size-dependent foraging abilities of the predator resulted in a positive feedback between foraging success on the shared resource at an early life stage and foraging success on the intermediate consumer later in life. By phenomenologically incorporating this feedback in an unstructured IGP model, we show that it also demotes coexistence in this simple setting, demonstrating the robustness of the negative effect of this feedback.
K E van de Wolfshaar; A M de Roos; L Persson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-06-12
Journal Detail:
Title:  The American naturalist     Volume:  168     ISSN:  1537-5323     ISO Abbreviation:  Am. Nat.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-07-28     Completed Date:  2007-02-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984688R     Medline TA:  Am Nat     Country:  United States    
Other Details:
Languages:  eng     Pagination:  62-75     Citation Subset:  IM    
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands.
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MeSH Terms
Body Size*
Competitive Behavior
Cyprinidae / physiology
Food Chain*
Models, Biological
Perches / physiology
Population Dynamics
Predatory Behavior*

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