Effect of elevated CO 2 on the demography of a leaf-sucking mite feeding on bean

• Published in: Oecologia 2000-04, Vol.123 (1), p.75-81
• Main Authors: Boutaleb Joutei, A, Roy, J, Van Impe, G, Lebrun, P
• Format: Article
• Language: English
• ISSN: 0029-8549; 1432-1939
• DOI: 10.1007/s004420050991

The effect of elevated CO on the demography of the arachnid species Tetranychus urticae feeding on Phaseolus vulgaris plants was analysed. This class of herbivores (Arachnida) and its feeding guild (cell content feeders) are under-represented in studies of the combined effects of herbivory and CO . The growth of bean was strongly stimulated by elevated CO . The number of leaves on lateral stems and of flowers increased but pod weight decreased. Leaf nitrogen content was 25% lower at elevated CO due to an increase in non-structural sugar concentration. Leaf water content was lower at elevated CO while leaf-specific mass and epidermis thickness were higher. Females of the mite raised at ambient or elevated CO , but all fed with leaves grown at ambient CO , had similar progenies. When females were raised on plants grown at elevated CO , the numbers of their progeny were reduced by 34% and 49% in the first and second generation respectively. Later stages of development were more reduced in elevated CO , suggesting that both fecundity and rate of development were affected. This study suggests that the abundance of T. urticae, and consequently the damage to the many crops it infests, might decrease in a future elevated-CO environment.