Consequences of enriched atmospheric CO{sub 2} and defoliation for foliar chemistry and gypsy moth performance
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Entomology
Elevated concentrations of atmospheric CO{sub 2} are likely to interact with other factors affecting plant physiology to alter plant chemical profiles and plant-herbivore interactions. The authors evaluated the independent and interactive effects of enriched CO{sub 2} and artificial defoliation on foliar chemistry of quaking aspen (Populus tremuloides) and sugar maple (Acer saccharum), and the consequences of such changes for short-term performance of the gypsy moth (Lymantria dispar). They grew aspen and maple seedlings in ambient and enriched CO{sub 2} environments at the University of wisconsin Biotron. Seven weeks after budbreak, trees in half of the rooms were subjected to 50% defoliation. Afterwards, foliage was collected for chemical analyses, and feeding trials were conducted with fourth-stadium gypsy moths. Enriched CO{sub 2} altered foliar levels of water, nitrogen, carbohydrates, and phenolics, and responses generally differed between the two tree species. Defoliation induced chemical changes only in aspen. They found no significant interactions between CO{sub 2} and defoliation for levels of carbon-based defenses (phenolic glycosides and tannins). CO{sub 2} treatment altered the performance of larvae fed aspen, but not maple, whereas defoliation had little effect on performance on insects. In general, results from this experimental system do not support the hypothesis that induction of carbon-based chemical defenses, and attendant effects on insects, will be stronger in a CO{sub 2}-enriched world.
- OSTI ID:
- 290113
- Journal Information:
- Journal of Chemical Ecology, Journal Name: Journal of Chemical Ecology Journal Issue: 10 Vol. 24; ISSN JCECD8; ISSN 0098-0331
- Country of Publication:
- United States
- Language:
- English
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