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DECREASED LEAF-MINER ABUNDANCE IN ELEVATED CO 2 : REDUCED LEAF QUALITY AND INCREASED PARASITOID ATTACK

DECREASED LEAF-MINER ABUNDANCE IN ELEVATED CO 2 : REDUCED LEAF QUALITY AND INCREASED PARASITOID... Most studies on the effects of elevated CO 2 have focused on the effects on plant growth and ecosystem processes. Fewer studies have examined the effects of elevated CO 2 on herbivory, and of these, most have examined feeding rates in laboratory conditions. Our study takes advantage of an open-top CO 2 fertilization study in a Florida scrub-oak community to examine the effects of elevated CO 2 on herbivore densities, herbivore feeding rates, and levels of attack of herbivores by natural enemies. Higher atmospheric CO 2 concentration reduced plant foliar nitrogen concentrations, decreased abundance of leaf-mining insect herbivores, increased per capita leaf consumption by leafminers, and increased leafminer mortality. As suggested by other authors, reduced foliar quality contributed to the increase in herbivore mortality, but only partly. The major factor increasing mortality was higher attack rate by parasitoids. Thus increasing CO 2 concentrations may reduce the survivorship of insect herbivores directly, by reducing plant quality, but also indirectly, by changing herbivore feeding and eliciting greater top-down pressure from natural enemies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecological Applications Ecological Society of America

DECREASED LEAF-MINER ABUNDANCE IN ELEVATED CO 2 : REDUCED LEAF QUALITY AND INCREASED PARASITOID ATTACK

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Publisher
Ecological Society of America
Copyright
Copyright © 1999 by the Ecological Society of America
Subject
Articles
ISSN
1051-0761
DOI
10.1890/1051-0761%281999%29009%5B0240:DLMAIE%5D2.0.CO%3B2
Publisher site
See Article on Publisher Site

Abstract

Most studies on the effects of elevated CO 2 have focused on the effects on plant growth and ecosystem processes. Fewer studies have examined the effects of elevated CO 2 on herbivory, and of these, most have examined feeding rates in laboratory conditions. Our study takes advantage of an open-top CO 2 fertilization study in a Florida scrub-oak community to examine the effects of elevated CO 2 on herbivore densities, herbivore feeding rates, and levels of attack of herbivores by natural enemies. Higher atmospheric CO 2 concentration reduced plant foliar nitrogen concentrations, decreased abundance of leaf-mining insect herbivores, increased per capita leaf consumption by leafminers, and increased leafminer mortality. As suggested by other authors, reduced foliar quality contributed to the increase in herbivore mortality, but only partly. The major factor increasing mortality was higher attack rate by parasitoids. Thus increasing CO 2 concentrations may reduce the survivorship of insect herbivores directly, by reducing plant quality, but also indirectly, by changing herbivore feeding and eliciting greater top-down pressure from natural enemies.

Journal

Ecological Applications – Ecological Society of America

Published: Feb 1, 1999

Keywords: carbon : nitrogen ratios ; field experiment ; herbivore-enemy interactions ; increased leaf consumption ; increased parasitism ; plant-herbivore interactions ; plant nitrogen ; CO 2 , response to elevation in

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