Insect herbivory in an intact forest understory under experimental CO 2 enrichment

Jason G. Hamilton, Arthur R. Zangerl, May R. Berenbaum, Jeffrey Pippen, Mihai Aldea, Evan H. DeLucia

Research output: Contribution to journalArticle

Abstract

Human-induced increases in atmospheric CO2 concentration have the potential to alter the chemical composition of plant tissue, and thereby affect the amount of tissue consumed by herbivorous arthropods. At the Duke Forest free-air concentration enrichment (FACE) facility in North Carolina (FACTS-1 research facility), we measured the amount of leaf tissue damaged by insects and other herbivorous arthropods during two growing seasons in a deciduous forest understory continuously exposed to ambient (360 μl l -1) and elevated (∼560 μl l-1) CO2 conditions. In 1999, there was a significant interaction between CO2 and species such that winged elm (Ulmus alata) showed lower herbivory in elevated CO2 plots, whereas red maple (Acer rubra) and sweetgum (Liquidambar styraciflua) did not. In 2000, our results did not achieve statistical significance but the magnitude of the result was consistent with the 1999 results. In 1999 and 2000, we found a decline (10-46%) in community-level herbivory in elevated CO2 plots driven primarily by reductions in herbivory on elm. The major contribution to total leaf damage was from missing tissue (66% of the damaged tissue), with galls, skeletonized, and discolored tissue making smaller contributions. It is unclear whether the decline in leaf damage is a result of altered insect populations, altered feeding, or a combination. We were not able to quantify insect populations, and our measurements did not resolve an effect of elevated CO2 on leaf chemical composition (total nitrogen, carbon, C/N, sugars, phenolics, starch). Despite predictions from a large number of single-species studies that herbivory may increase under elevated CO2, we have found a decrease in herbivory in a naturally established forest understory exposed to a full suite of insect herbivores and their predators.

Original languageEnglish (US)
Pages (from-to)566-573
Number of pages8
JournalOecologia
Volume138
Issue number4
DOIs
StatePublished - Mar 1 2004

Fingerprint

herbivory
understory
herbivores
carbon dioxide
insect
insects
Ulmus alata
Acer rubrum
arthropod
chemical composition
arthropods
leaves
free air carbon dioxide enrichment
damage
Liquidambar styraciflua
gall
research facilities
Ulmus
deciduous forest
starch

Keywords

  • Arthropod herbivores
  • Elevated carbon dioxide
  • FACE
  • Folivory

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Insect herbivory in an intact forest understory under experimental CO 2 enrichment. / Hamilton, Jason G.; Zangerl, Arthur R.; Berenbaum, May R.; Pippen, Jeffrey; Aldea, Mihai; DeLucia, Evan H.

In: Oecologia, Vol. 138, No. 4, 01.03.2004, p. 566-573.

Research output: Contribution to journalArticle

Hamilton, Jason G. ; Zangerl, Arthur R. ; Berenbaum, May R. ; Pippen, Jeffrey ; Aldea, Mihai ; DeLucia, Evan H. / Insect herbivory in an intact forest understory under experimental CO 2 enrichment. In: Oecologia. 2004 ; Vol. 138, No. 4. pp. 566-573.
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