Document Detail

Relation between complexity and stability in food webs with adaptive behavior.
MedLine Citation:
PMID:  17543344     Owner:  NLM     Status:  MEDLINE    
We investigate the influence of functional responses (Lotka-Volterra or Holling type), initial topological web structure (randomly connected or niche model), adaptive behavior (adaptive foraging and predator avoidance) and the type of constraints on the adaptive behavior (linear or nonlinear) on the stability and structure of food webs. Two kinds of stability are considered: one is the network robustness (i.e., the proportion of species surviving after population dynamics) and the other is the species deletion stability. When evaluating the network structure, we consider link density as well as the trophic level structure. We show that the types of functional responses and initial web structure do not have a large effect on the stability of food webs, but foraging behavior has a large stabilizing effect. It leads to a positive complexity-stability relationship whenever higher "complexity" implies more potential prey per species. The other type of adaptive behavior, predator avoidance behavior, makes food webs only slightly more stable. The observed link density after population dynamics depends strongly on the presence or absence of adaptive foraging, and on the type of constraints used. We also show that the trophic level structure is preserved under population dynamics with adaptive foraging.
Satoshi Uchida; Barbara Drossel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-04-27
Journal Detail:
Title:  Journal of theoretical biology     Volume:  247     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-07-27     Completed Date:  2007-09-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  713-22     Citation Subset:  IM    
Institute of Solid-State Physics, Darmstadt University of Technology, Hochschulstrasse 6, D-64289 Darmstadt, Germany.
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MeSH Terms
Adaptation, Physiological*
Computer Simulation*
Feeding Behavior*
Food Chain*
Models, Biological
Population Dynamics
Predatory Behavior

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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