Document Detail


Adaptive foraging does not always lead to more complex food webs.
MedLine Citation:
PMID:  20600137     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Recent modeling studies exploring the effect of consumers' adaptivity in diet composition on food web complexity invariably suggest that adaptivity in foraging decisions of consumers makes food webs more complex. That is, it allows for survival of a higher number of species when compared with non-adaptive food webs. Population-dynamical models in these studies share two features: parameters are chosen uniformly for all species, i.e. they are species-independent, and adaptive foraging is described by the search image model. In this article, we relax both these assumptions. Specifically, we allow parameters to vary among the species and consider the diet choice model as an alternative model of adaptive foraging. Our analysis leads to three important predictions. First, for species-independent parameter values for which the search image model demonstrates a significant effect of adaptive foraging on food web complexity, the diet choice model produces no such effect. Second, the effect of adaptive foraging through the search image model attenuates when parameter values cease to be species-independent. Finally, for the diet choice model we observe no (significant) effect of adaptive foraging on food web complexity. All these observations suggest that adaptive foraging does not always lead to more complex food webs. As a corollary, future studies of food web dynamics should pay careful attention to the choice of type of adaptive foraging model as well as of parameter values.
Authors:
Ludek Berec; Jan Eisner; Vlastimil Krivan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-30
Journal Detail:
Title:  Journal of theoretical biology     Volume:  266     ISSN:  1095-8541     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-13     Completed Date:  2010-11-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  211-8     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Theoretical Ecology, Institute of Entomology, Biology Centre ASCR, and Institute of Mathematics and Biomathematics, Faculty of Science, University of South Bohemia, Branisovská 31, 37005 Ceské Budejovice, Czech Republic. berec@entu.cas.cz
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Biological / physiology*
Animals
Appetitive Behavior / physiology
Computer Simulation
Diet*
Food Chain*
Food Preferences / physiology*
Models, Biological*
Population Dynamics
Species Specificity

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