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ID: 233535.0, MPI für Evolutionsbiologie / Ecophysiology
Experimental demonstration of chaos in a microbial food web
Authors:Becks, Lutz; Hilker, Frank M.; Malchow, Horst; Jürgens, Klaus; Arndt, Hartmut
Language:English
Date of Publication (YYYY-MM-DD):2005-06-30
Title of Journal:Nature
Volume:435
Issue / Number:7046
Start Page:1226
End Page:1229
Review Status:not specified
Audience:Not Specified
Abstract / Description:Discovering why natural population densities change over time and vary with location is a central goal of ecological and evolutional disciplines. The recognition that even simple ecological systems can undergo chaotic behaviour has made chaos a topic of considerable interest among theoretical ecologists(1-4). However, there is still a lack of experimental evidence that chaotic behaviour occurs in the real world of coexisting populations in multi-species systems. Here we study the dynamics of a defined predator - prey system consisting of a bacterivorous ciliate and two bacterial prey species. The bacterial species preferred by the ciliate was the superior competitor. Experimental conditions were kept constant with continuous cultivation in a one-stage chemostat. We show that the dynamic behaviour of such a two-prey, one-predator system includes chaotic behaviour, as well as stable limit cycles and coexistence at equilibrium. Changes in the population dynamics were triggered by changes in the dilution rates of the chemostat. The observed dynamics were verified by estimating the corresponding Lyapunov exponents. Such a defined microbial food web offers a new possibility for the experimental study of deterministic chaos in real biological systems
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Affiliations:MPI für Limnologie/Abt. Ökophysiologie
External Affiliations:Univ Cologne, Inst Zool, Dept Gen Ecol & Limnol
D-50923 Cologne, Germany; Univ Osnabruck, Inst Environm Syst Res, Dept Math & Comp Sci, D-49069 Osnabruck, Germany; Balt Sea Res Inst D-18119 Rostock Germany
Identifiers:ISSN:0028-0836 [ID-No:1]
DOI:10.1038/nature03627 [ID-No:2]
LOCALID:2395/S 38384 [Listen-Nummer/S-Nummer]
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