高效氯氟氰菊酯对东亚小花蝽捕食功能反应的影响

Effect of Lambda-cyhalothrinon on Predatory Function Response of Orius sauteri

为了研究高效氯氟氰菊酯对东亚小花蝽雌成虫捕食功能反应的影响,比较分析了LC25、LC50、LC75高效氯氟氰菊酯胁迫3日龄东亚小花蝽雌成虫后,对大豆蚜捕食量、寻找效应、猎物密度效应、种内分摊竞争效应和功能反应等的影响。研究表明,对照组与LC25、LC50高效氯氟氰菊酯胁迫的东亚小花蝽成虫受猎物密度效应影响明显,而LC75高效氯氟氰菊酯胁迫的东亚小花蝽成虫受猎物密度效应影响不明显;在药剂浓度为0 mg/L和140 mg/L时,捕食量达到的最大值和最小值分别为12.33和0.83头,寻找效应达到的最大值和最小值分别为0.96和0.10;受不同浓度药剂胁迫的东亚小花蝽成虫对大豆蚜的捕食能力和寻找效应均随着药剂浓度的增加而下降;捕食量随大豆蚜虫口密度增加而增多,种内竞争分摊强度随小花蝽数量增加而增强,平均捕食量降低;在LC50高效氯氟氰菊酯胁迫下,东亚小花蝽成虫捕食作用率方程为E=0.1255P-0.2956,分摊竞争强度方程为I=0.5401logP^-0.0033。

Influence of lambda-cyhalothrin on female adults of Orius sauteri was studied in the predators stressed by lambda-cyhalothrin at LC25, LC50 and LC75 in terms of soybean aphid predation, searching efficiency, prey density effect, intraspecific allocation competition strength, and functional response. The results showed that, in O. sauteri adults stressed with LC25 and LC50 and in the control, prey density effect was obvious while in the insects stressed with LC75, it was not obvious. When the pesticide concentration was 0 mg/L, predation reached the maximum of 12.33 and searching efficiency peaked at 0.96;when the pesticide concentration was 140 mg/L, predation was reduced to the minimum of 0.83 and searching efficiency was reduced to 0.10. With the increase of pesticide concentration, the stressed O. sauteri adults showed decreased predatory capacity and searching efficiency. The predation number increased with the increase of soybean aphid density, the intraspecific allocation competition strength enhanced with the increase of the number of O. sauteri, while the average predation number was reduced. With LC50, the predation efficiency equation of O. sauteri adult is E=0.1255 P-0.2956, the allocation competition strength equation is I=0.5401 logP^-0.0033.