Document Detail

Experimental warming transforms multiple predator effects in a grassland food web.
MedLine Citation:
PMID:  19780788     Owner:  NLM     Status:  MEDLINE    
This experimental study tests new theory for multiple predator effects on communities by using warming to alter predator habitat use and hence direct and indirect interactions in a grassland food web containing two dominant spider predator species, a dominant grasshopper herbivore and grass and herb plants. Experimental warming further offers insight into how climate change might alter direct and indirect effects. Under ambient environmental conditions, spiders used habitat in spatially complementary locations. Consistent with predictions, the multiple predator effect on grasshoppers and on plants was the average of the individual predator effects. Warming strengthened the single predator effects. It also caused the spider species to overlap lower in the vegetation canopy. Consistent with predictions, the system was transformed into an intraguild predation system with the consequent extinction of one spider species. The results portend climate caused loss of predator diversity with important consequences for food web structure and function.
Brandon T Barton; Oswald J Schmitz
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-09-23
Journal Detail:
Title:  Ecology letters     Volume:  12     ISSN:  1461-0248     ISO Abbreviation:  Ecol. Lett.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-25     Completed Date:  2010-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101121949     Medline TA:  Ecol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  1317-25     Citation Subset:  IM    
School of Forestry and Environmental Studies, Yale University, 370 Prospect St., New Haven, CT 06511, USA.
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MeSH Terms
Climate Change*
Food Chain*
Hot Temperature
Population Density
Predatory Behavior*

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