Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain.

Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain. Research Abstract Details 

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Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain. Abstract Text:

A P Beckerman,M Uriarte,O J Schmitz,

Predators of herbivorous animals can affect plant populations by altering herbivore density, behavior, or both. To test whether the indirect effect of predators on plants arises from density or behavioral responses in a herbivore population, we experimentally examined the dynamics of terrestrial food chains comprised of old field plants, leaf-chewing grasshoppers, and spider predators in Northeast Connecticut. To separate the effects of predators on herbivore density from the effects on herbivore behavior, we created two classes of spiders: (i) risk spiders that had their feeding mouth parts glued to render them incapable of killing prey and (ii) predator spiders that remained unmanipulated. We found that the effect of predators on plants resulted from predator-induced changes in herbivore behavior (shifts in activity time and diet selection) rather than from predator-induced changes in grasshopper density. Neither predator nor risk spiders had a significant effect on grasshopper density relative to a control. This demonstrates that the behavioral response of prey to predators can have a strong impact on the dynamics of terrestrial food chains. The results make a compelling case to examine behavioral as well as density effects in theoretical and empirical research on food chain dynamics.

Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain. Publishing Authors By Initials

AP Beckerman,M Uriarte,OJ Schmitz,

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Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 94

Page Numbers: 10735-8

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 30

MONTH: Sep

YEAR: 1997

Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Experimental evidence for a behavior-mediated trophic cascade in a terrestrial food chain.

AFFILIATION: Yale University, School of Forestry and Environmental Studies, 370 Prospect Street, New Haven, CT 06511.

Country: United States

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MEDLINETA: Proc Natl Acad Sci U S A

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