Nonlinear responses of spider mites to drought‐stressed host plants
作者:
GREGORY M. ENGLISH‐LOEB,
期刊:
Ecological Entomology
(WILEY Available online 1989)
卷期:
Volume 14,
issue 1
页码: 45-55
ISSN:0307-6946
年代: 1989
DOI:10.1111/j.1365-2311.1989.tb00752.x
出版商: Blackwell Publishing Ltd
关键词: Spider mites;drought stress;population dynamics;outbreaks;nonlinear
数据来源: WILEY
摘要:
Abstract.1. This study examines the shape of the population response curve of the two‐spotted spider mite, Tetranychus urticae Koch, feeding on bean plants, Phaseolus vulgaris L., which have been subjected to one of a range of drought stresses.2. Abundance of spider mites declined at slight drought stress, increased at intermediate intensities of stress, and declined again at severe stress.3. Fecundity showed the same pattern found for total abundance. Developmental rates of immatures, on the other hand, generally increased with stress intensity. Survivorship of immatures and adult females appeared unrelated to stress intensity.4. These results indicate that responses of mites to drought‐stressed beans are nonlinear. Such a pattern helps explain contradictory results obtained for spider mites and other arthropod herbivo
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