Responses of three generations of a xylem-feeding insect, Neophilaenus lineatus (Homoptera), to elevated CO2
Article first published online: 24 DEC 2001
Global Change Biology
Volume 5, Issue 4, pages 395–401, April 1999
How to Cite
Brooks, G. L. and Whittaker, J. B. (1999), Responses of three generations of a xylem-feeding insect, Neophilaenus lineatus (Homoptera), to elevated CO2. Global Change Biology, 5: 395–401. doi: 10.1046/j.1365-2486.1999.00239.x
- Issue published online: 24 DEC 2001
- Article first published online: 24 DEC 2001
- Received 15 March 1998; revised version received 11 June and accepted 20 June 1998
- elevated carbon dioxide;
- xylem feeding
A population of the xylem-feeding spittlebug, Neophilaenus lineatus, on blocks of natural vegetation transferred to large hemispherical chambers was studied over two generations with continuous exposure to elevated CO2 (600 ppm). The third generation was transferred from the blocks to potted Juncus squarrosus to enable measurements of fecundity. The principal food plant throughout was Juncus squarrosus. Survival of the nymphs was reduced by more than 20% in elevated CO2 relative to ambient (350 ppm) in both years of the main experiment. Elevated CO2 also delayed development by one or more nymphal instars in each year. Fecundity was not significantly affected.
The C/N ratio of whole Juncus leaves was increased in elevated CO2 and the transpiration rates of the plants were reduced. These changes may have been responsible for the effect of elevated CO2 on spittlebug performance. However, other factors such as plant architecture and microclimate may also be important.