短期驯化对米蛾卵饲养的东亚小花蝽捕食瓜蚜功能反应的影响

The effects of short-time food acclimation on the functional response of Orius sauteri reared to Corcyra cephalonica eggs

为探究米蛾Corcyra cephalonica卵饲养的东亚小花蝽Orius sauteri对瓜蚜Aphis gossypii的控害潜能及对其是否进行短期驯化的必要性,以水果黄瓜斯托克为寄主植物,在实验室条件下分别进行了米蛾卵饲喂及预先饲喂瓜蚜2 d的东亚小花蝽(5龄若虫和雌成虫)对瓜蚜的捕食功能反应研究。结果显示,2种处理的东亚小花蝽5龄若虫和雌成虫对瓜蚜的捕食功能反应均符合HollingⅡ型反应模型,即随着猎物密度的增加,其对瓜蚜的捕食量先增加,后趋于稳定;其中预先饲喂2 d瓜蚜的东亚小花蝽5龄若虫在瓜蚜密度每皿为30头、雌成虫在每皿15头时,其捕食量均显著高于相同瓜蚜密度处理下一直饲喂米蛾卵的东亚小花蝽;其余瓜蚜密度下2种处理间无显著差异。瓜蚜驯化后的东亚小花蝽5龄若虫和雌成虫对瓜蚜的瞬间攻击率均高于未经瓜蚜驯化的。表明短期饲喂驯化可在一定程度上提高东亚小花蝽对靶标害虫瓜蚜的捕食能力和识别能力。

The present study estimated the potential suppression of pest aphid Aphis gossypii by Orius sauteri fed on Corcyra cephalonica eggs,and the influences of short adaptive pre-feeding on A. gossypii.Using the fruit cucumber variety ‘Stoke'( Israel) as the host plant,the functional response of O. sauteri( 5th-instar nymphs and female adults) reared on C. cephalonica eggs and A. gossypii for two days were tested. The results showed that the functional response of O. sauteri( 5th-instar nymphs and female adults) under two different rearing conditions fitted to Holling Ⅱ model. At the densities of 5,15,30 and 50 aphids per petri dish,the predation rates increased with increasing prey density. The predation of O. sauteri at 30 / petri dish( 5th-instar nymphs) and 15 / petri dish( female adult) after pre-rearing on aphids for two days were significantly higher than that of the flower bugs reared on C. cephalonica eggs.There were no significant differences in predation among other prey densities. The instant attack rates of O. sauteri reared on A. gossypii for two days were higher than those of O. sauteri reared only on C.cephalonica eggs. These results indicated that the pre-rearing of O. sauteri on the target prey for adaptivefitness may enhanced the predation rates to a certain extent.