Functional response of the predator <Emphasis Type="Italic">Scolothrips takahashii</Emphasis> to hawthorn spider mite, <Emphasis Type="Italic">Tetranychus viennensis</Emphasis>: effect
of age and temperature |
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Authors: | Li Ding-Xu Tian Juan Shen Zuo-Rui |
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Affiliation: | (1) Department of Horticulture, Henan University of Science and Technology, Luoyang, Henan Province, 471003, P.R. China;(2) Department of Entomology, China Agricultural University, Beijing, 100094, P.R. China |
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Abstract: | A leaf disc bioassay was employed to examine the effects of temperature and predator age on functional response of an acarophagous
thrips, Scolothrips takahashii Priesner, to hawthorn spider mite, Tetranychus viennensis Zacher, in the laboratory. The results indicated that the predatory thrips exhibited type-II functional responses against
the mites under various temperatures, and that females are more voracious than males. Analysis showed that temperature had
significant effects on the predatory capacity of adult thrips over the range of 20–35 °C. Attack rate in females linearly
increased with temperature while in males it was independent of temperature. Handling times in both males and females decreased
linearly with increasing temperature. Extended response models describing the functional response with temperature incorporated
as a parameter were developed, yielding an estimated maximum numbers of prey attacked at four temperatures were 38.38, 55.06,
71.74 and 88.42 eggs per day for females, and 15.11, 26.11, 37.11 and 48.01 eggs per day for males, respectively. The age
of predator affected both the type of the functional response shown and the magnitude of predation by S.␣takahashii on the spider mite. Females of various ages exhibited Type-II functional responses with similar attack rates, but handling
time prolonged linearly as age increased: the handling times in 15- and 18-d-old females were significantly longer than in
6-d-old thrips. However, Type-I functional responses were determined for males aged 12 d or more; the maximum number of prey
eaten in 24 h decreased as age increased. The implications of the results for the management of hawthorn spider mite are discussed. |
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Keywords: | age functional response Scolothrips takahashii temperature Tetranychus viennensis |
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