Document Detail


Intraguild predation reduces redundancy of predator species in multiple predator assemblage.
MedLine Citation:
PMID:  17009759     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. Interference between predator species frequently decreases predation rates, lowering the risk of predation for shared prey. However, such interference can also occur between conspecific predators. 2. Therefore, to understand the importance of predator biodiversity and the degree that predator species can be considered functionally interchangeable, we determined the degree of additivity and redundancy of predators in multiple- and single-species combinations. 3. We show that interference between two invasive species of predatory crabs, Carcinus maenas and Hemigrapsus sanguineus, reduced the risk of predation for shared amphipod prey, and had redundant per capita effects in most multiple- and single-species predator combinations. 4. However, when predator combinations with the potential for intraguild predation were examined, predator interference increased and predator redundancy decreased. 5. Our study indicates that trophic structure is important in determining how the effects of predator species combine and demonstrates the utility of determining the redundancy, as well as the additivity, of multiple predator species.
Authors:
Blaine D Griffen; James E Byers
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of animal ecology     Volume:  75     ISSN:  0021-8790     ISO Abbreviation:  J Anim Ecol     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-10-02     Completed Date:  2006-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  959-66     Citation Subset:  IM    
Affiliation:
University of New Hampshire, Zoology Department, 46 College Road, Durham, NH 03824, USA. bgriffen@cisunix.unh.edu
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MeSH Terms
Descriptor/Qualifier:
Amphipoda / physiology
Animals
Brachyura / physiology*
Ecosystem*
Food Chain
Predatory Behavior / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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