异色瓢虫密度对槐蚜捕食的干扰效应研究

Studies on the interference effects of Harmonias axyridis Pallas on Aphis sophoricola Zhang

在特定空间条件下,异色瓢虫34、龄幼虫和成虫对槐蚜的寻找效应随自身密度的增加而降低,干扰效应则相反;密度的增加对老熟幼虫和成虫的寻找效应以及干扰效应影响较低龄幼虫更为明显。各干扰模型中,经χ2检验,理论值和实测值拟合较好。

The results indicated that the searching efficiency of the 3rd or 4th instar larvae and adults of Harmonias axyridis Pallas decreased with the increase of predator density in a specific space, but the interference effect was just the opposite. Its effects on on the 4th instar larvae and adults were more evident than on the 3rd instars with the increase of predator density. The interference model of H. axyridis larvae and adults was constructed, and 7.2 test showed that the theoretical expectation calculated by the interference model fitted well with the observed values