加州新小绥螨对猎物的选择行为及其扩散行为

本文研究了柑橘全爪螨Panonychus citri （McGregor）不同螨态及其丝网对加州新小绥螨Neoseiuluscalifornicus的吸引作用和影响加州新小绥螨扩散行为的因素。结果表明，柑橘全爪螨完整丝网对加州新小绥螨吸引最强，在试验的5 h中，对加州新小绥螨吸引作用在第1 h效果显著，第2~5 h效果极显著，其中第3 h时的吸引作用最强达78.33%；柑橘全爪螨雌成螨、若螨和幼螨对加州新小绥螨均具有不同强度的吸引能力，吸引作用最强时分别达76.67%、71.67%和68.33%；猎物密度影响不同取食经历下加州新小绥螨的扩散行为，其扩散时间与生境中的柑橘全爪螨卵初始密度呈正相关，处于饥饿状态和自身密度较高时会加速加州新小绥螨的扩散行为，加州新小绥螨雌后若螨扩散时间低于加州新小绥螨雌成螨。

Prey Preference and Diffusion Behavior of Neoseiulus californicus (McGregor) (Acari: Phytoseiidae)

Preference of Neoseiulus californicus (McGregor) for different stages (larva, nymph, female adult) and web-nest of Panonychus citri (McGregor) and the factors affecting the predator diffusion were investigated. The results showed that N. californicus preferred the most for the intact web-nest of P. citri. The predators were significantly attracted to the prey web since 1 h after the starting of evaluation, with the highest rate 78.3% reaching at the 3 h time point over a 5-h observation. The female adult, nymph, and young P. citri mites attracted N. californicus at varying rates, the highest being 76.67%, 71.67%, and 68.33%, respectively. Diffusion behaviors of N. californicus were examined in association with P. citri density and with different feeding experience. Diffusion rate of N. californicus was positively correlated with the initial prey egg density. Starvation and high density of the predator enhanced diffusion. Diffusion rate also differed between stages, lower in the female nymphs than in the female adults.