Document Detail

Bistability and an Allee effect as emergent consequences of stage-specific predation.
MedLine Citation:
PMID:  15935390     Owner:  NLM     Status:  MEDLINE    
The Allee effect, a reduction of individual fitness at low population density that can lead to sudden and unannounced extinctions, has been shown to come about through a number of mechanisms, usually associated with group behavior or mate search. Recent papers show that it may arise through size-selective predation, without explicit assumptions relating individual fitness to population density. It arises from the shift that a predator induces in the population stage distribution of its prey. We study the parameter conditions that lead to such an emergent Allee effect. The emergent Allee effect occurs under fairly broad conditions. We show that stage-specific predation can also induce bistability between alternative states where both prey and predator are present. A perturbation analysis on the equilibria shows that all equilibria are highly robust to changes in predator density. Our work shows that when size-specific interactions are taken into account, bistabilities and catastrophic collapses are possible even in purely exploitative food webs, which has substantial implications for questions related to food web theory and conservation issues.
Tobias van Kooten; André M de Roos; Lennart Persson
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  237     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-08-29     Completed Date:  2006-02-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  67-74     Citation Subset:  IM    
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94084, 1090 GB Amsterdam, The Netherlands.
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MeSH Terms
Food Chain*
Models, Biological
Models, Statistical*
Population Density
Population Dynamics
Predatory Behavior*

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