竹盲走螨对竹裂爪螨的捕食功能

Predation of Typhlodromus bambusae Ehara on Schizotetranychus bambsae.

在实验室模拟条件下，系统研究了竹盲走螨对竹裂爪螨的控制作用．结果表明，在25±0．5℃条件下，竹盲走螨对竹裂爪螨各螨态的功能反应均属HollingⅡ型．在同一温度条件下，雌竹盲走螨成螨对竹裂爪螨各螨态的处置时间依次为卵〈幼螨〈前若螨〈后若螨〈雌成螨．竹裂爪螨卵、幼螨、若螨、雌成螨共存时，竹盲走螨嗜食卵、幼螨和前若螨（Q〉1），但其对卵与幼螨及幼螨与前若螨无偏嗜现象．当竹裂爪螨密度低于9头时，竹盲走螨的产卵量随密度增加而增加；9～15头时，其日平均产卵量保持在每雌2粒左右；超过15头以后，产卵量反而下降，说明猎物密度过高对捕食者生存、繁殖存在干扰作用．

The simulation study under laboratory condition showed that the functional responses of Typhlodromus bambuse to Schizotetranychus bambuse at different development stages could be expressed by the curve of Holling Type Ⅱ. The number of prey consumed by predator quickly increased with initial prey density, but soon leveled off. At 25 ± 0.5°, the handling time （Th） of T. bambuse to S. bambusae at the stages of egg, larva, protonymph, deurtonymph and female was in order of egg〈 larva〈 protonymph〈 deurtonymph〈 female, and the selection coefficient （ Q ） of T. bambusae to S. bambusae egg, larva, protonymph, deurtonymph and female adult was 1,47, 1,34, 1. 16,0.90 and 0.15, respectively. The numerical response of T. bambusae to S.bambusae revealed that the fecundity of the Phytoseiidae mite was significantly affected by the prey density. When the ratio of predator to prey was 1 ： 1 - 9, the daily oviposition of the predator varied from 0.5 to 2.0 eggs per female, which was increased with increasing prey density, while if the ratio was 1 ： 15 or more, the daily oviposition decreased to about 1, 8 eggs per female, which was probably due to the interference of high prey density to predation.