Document Detail

Consumers that are not 'ideal' or 'free' can still approach the ideal free distribution using simple patch-leaving rules.
MedLine Citation:
PMID:  19486205     Owner:  NLM     Status:  MEDLINE    
1. The ideal free distribution (IFD) has been widely used to determine whether consumers distribute themselves optimally. However, this theory is based on three assumptions that are clearly violated in many systems. The theory assumes that all individuals know the quality of each available site, are equally free to move between all sites, and have equal competitive abilities. 2. I examine the utility of this theory to predict the distribution of the invasive European green crab Carcinus maenas, a species that likely violates all of these assumptions. I demonstrate three main findings. 3. First, understanding how density-dependent interference and size alter individual foraging behaviour is important for understanding the density and biomass distribution of C. maenas in invaded habitats. 4. Second, once behavioural mechanisms of crab foraging are accurately included in the model, the IFD does a good job of predicting the distribution of C. maenas, even though C. maenas violates the theory's fundamental assumptions. 5. Third, C. maenas' distribution can be obtained using simple decision rules and reasonable movement patterns.
Blaine D Griffen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-21
Journal Detail:
Title:  The Journal of animal ecology     Volume:  78     ISSN:  1365-2656     ISO Abbreviation:  J Anim Ecol     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-08-17     Completed Date:  2009-10-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  919-27     Citation Subset:  IM    
Department of Biological Sciences and Marine Science Program, University of South Carolina, Columbia, SC 29208, USA.
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MeSH Terms
Bivalvia / physiology
Brachyura / physiology*
Computer Simulation
Consummatory Behavior / physiology*
Models, Biological*
Population Density
Population Dynamics
Time Factors

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

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