Document Detail


Constraints on food chain length arising from regional metacommunity dynamics.
MedLine Citation:
PMID:  21367786     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Classical ecological theory has proposed several determinants of food chain length, but the role of metacommunity dynamics has not yet been fully considered. By modelling patchy predator-prey metacommunities with extinction-colonization dynamics, we identify two distinct constraints on food chain length. First, finite colonization rates limit predator occupancy to a subset of prey-occupied sites. Second, intrinsic extinction rates accumulate along trophic chains. We show how both processes concur to decrease maximal and average food chain length in metacommunities. This decrease is mitigated if predators track their prey during colonization (habitat selection) and can be reinforced by top-down control of prey vital rates (especially extinction). Moreover, top-down control of colonization and habitat selection can interact to produce a counterintuitive positive relationship between perturbation rate and food chain length. Our results show how novel limits to food chain length emerge in spatially structured communities. We discuss the connections between these constraints and the ones commonly discussed, and suggest ways to test for metacommunity effects in food webs.
Authors:
Vincent Calcagno; François Massol; Nicolas Mouquet; Philippe Jarne; Patrice David
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-03-02
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  278     ISSN:  1471-2954     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-09-13     Completed Date:  2012-01-17     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  3042-9     Citation Subset:  IM    
Affiliation:
Université Montpellier 2, CNRS, Institut des Sciences de l'Evolution, Place Eugène Bataillon, 34095 Montpellier cedex 5, France. vincent.calcagno@mcgill.ca
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MeSH Terms
Descriptor/Qualifier:
Animals
Ecosystem
Extinction, Biological
Food Chain*
Models, Biological*
Population Dynamics
Comments/Corrections

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