Decreased leaf-miner abundance in elevated CO2: Reduced leaf quality and increased parasitoid attack

Peter Stiling, Anthony M. Rossi, Bruce Hungate, Paul Dijkstra, C. Ross Hinkle, W. M. Knott, B. Drake

Research output: Contribution to journalArticle

104 Scopus citations

Abstract

Most studies on the effects of elevated CO2 have focused on the effects on plant growth and ecosystem processes. Fewer studies have examined the effects of elevated CO2 on herbivory, and of these, most have examined feeding rates in laboratory conditions. Our study takes advantage of an open-top CO2 fertilization study in a Florida scrub-oak community to examine the effects of elevated CO2 on herbivore densities, herbivore feeding rates, and levels of attack of herbivores by natural enemies. Higher atmospheric CO2 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 CO2 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.

Original languageEnglish (US)
Pages (from-to)240-244
Number of pages5
JournalEcological Applications
Volume9
Issue number1
DOIs
StatePublished - Feb 1999
Externally publishedYes

Keywords

  • CO, response to elevation in
  • Carbon
  • Field experiment
  • Herbivore-enemy interactions
  • Increased leaf consumption
  • Increased parasitism
  • Nitrogen ratios
  • Plant nitrogen
  • Plant-herbivore interactions

ASJC Scopus subject areas

  • Ecology

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