Document Detail

The effects of resource enrichment, dispersal, and predation on local and metacommunity structure.
MedLine Citation:
PMID:  16639564     Owner:  NLM     Status:  MEDLINE    
Community structure is the observable outcome of numerous processes. We conducted a laboratory experiment using a microbial model system to disentangle effects of nutrient enrichment, dispersal, and predation on prey species richness and predator abundance at local and metacommunity scales. Prey species included: Chilomonas sp., Colpidium striatum, Colpoda cucullus, Paramecium tetraurelia, P. caudatum, Philodina sp., Spirostomum sp., Tetrahymena thermophila, and Uronema sp., and Stentor coeruleus was the predator used. We hypothesized that: (1) increased basal resources should maintain greater species richness and higher predator abundance; (2) dispersal should maintain greater species richness; and (3) predation should reduce species richness, especially in the high resource treatments relative to no-predator treatments. Our results support all three hypotheses. Further, we show that dispersal affects richness at the local community scale but not at the metacommunity scale. However, predation seems to have major effects at both the local and metacommunity scale. Overall, our results show that effects of resource enrichment, dispersal, and predation were mostly additive rather than interactive, indicating that it may be sometimes easier to understand their effects than generally thought due to complex interactive effects.
Marc W Cadotte; Allison M Fortner; Tadashi Fukami
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-04-26
Journal Detail:
Title:  Oecologia     Volume:  149     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-09-11     Completed Date:  2006-11-20     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  150-7     Citation Subset:  IM    
Complex Systems Group, Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA.
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MeSH Terms
Analysis of Variance
Bacterial Physiological Phenomena
Eukaryota / physiology
Food Chain*
Models, Theoretical*
Population Dynamics

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