Document Detail

Allometry and catastrophic regime shifts in food chains.
MedLine Citation:
PMID:  20708628     Owner:  NLM     Status:  MEDLINE    
Population dynamics can reflect the body mass distribution of species because there is an allometric relationship between the average body mass of species and its metabolic timescale. Since predators are generally larger than their prey, a hierarchical structure from fast timescales to slow timescales can be a general structure in food webs. In this paper, we show that changes of the metabolic timescale ratio can cause catastrophic shifts. Then, we investigate a two-dimensional parameter space with the timescale ratio and the carrying capacity of basal species, and reveal that the timescale ratio characterizes the response of the system to environmental variation. Finally, in a bistable regime, we try to clarify the relationship between the trophic position of a species and the extent to which the species induces attractor switching. We saw that, in a 4-species food chain, top predators and second consumers induce attractor switching easily compared to first consumers and basal species.
Kenta Suzuki; Takashi Ikegami
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Publication Detail:
Type:  Journal Article     Date:  2010-08-12
Journal Detail:
Title:  Journal of theoretical biology     Volume:  267     ISSN:  1095-8541     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-09-27     Completed Date:  2011-01-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  121-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Department of General Systems Studies, The Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Tokyo 153-8902, Japan.
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MeSH Terms
Body Weight
Food Chain*
Population Dynamics
Predatory Behavior*
Species Specificity

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