| Environmental fluctuations can stabilize food web dynamics by increasing synchrony. | |
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MedLine Citation:
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PMID: 17727665 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Natural food webs are species-rich, but classical theory suggests that they should be unstable and extinction-prone. Asynchronous fluctuations in the densities of competing consumers can stabilize food web dynamics in constant environments. However, environmental fluctuations often synchronize dynamics in nature. Using the same 'diamond-shape' food web model first used to demonstrate the stabilizing effects of asynchrony in constant environments, we show that weak-to-moderate environmentally induced fluctuations in consumer mortality rates stabilize food webs while disrupting asynchrony. Synchrony actually promotes stability because: (i) synchronous declines in consumer density reduce the maximum abundance of top predators and (ii) resource competition quickly converts synchronous increases in consumer density into synchronous declines. These results are robust to details of food web topology and the implementation of environmental fluctuations. The fluctuation strengths that enhance stability are within the range experienced naturally by many species, suggesting that stabilization via environmental fluctuations is a realistic possibility. |
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Authors:
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David A Vasseur; Jeremy W Fox |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-08-28 |
Journal Detail:
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Title: Ecology letters Volume: 10 ISSN: 1461-0248 ISO Abbreviation: Ecol. Lett. Publication Date: 2007 Nov |
Date Detail:
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Created Date: 2007-10-03 Completed Date: 2007-11-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101121949 Medline TA: Ecol Lett Country: England |
Other Details:
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Languages: eng Pagination: 1066-74 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4. dvasseur@ucalgary.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biodiversity* Competitive Behavior* Ecosystem* Environment Food Chain* Population Density Population Dynamics Predatory Behavior* Spatial Behavior |
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