七星瓢虫成虫对狭冠网蝽的捕食功能反应研究

Research on the functional responses of Coccinella septempunctata L. to prey on Stephanitis anagustata Bu. sp. nov

在实验室自然温度条件下,初步研究了七星瓢虫(Coccinella septempunctata L.)对狭冠网蝽 (Stephanitis anagustata Bu.sp.nov)若虫的捕食功能反应。结果表明,七星瓢虫成虫对狭冠网蝽若虫密度的功能反应属于Ⅱ型,可用Holling圆盘方程拟合;随着狭冠网蝽若虫密度的增大,七星瓢虫成虫的捕食量也逐渐增加,其最大捕食量为370．4头;在供试的狭冠网蝽若虫、云杉大蚜和杉针黄叶甲3种猎物中,七星瓢虫成虫对狭冠网蝽若虫均表现出较强的选择性;当七星瓢虫与狭冠网蝽的数量同比例增加时,七星瓢虫个体间的相互干扰系数为0．076 9; 当狭冠网蝽数量不变而七星瓢虫数量增加时,七星瓢虫个体间的相互干扰系数为0．694 0。

The functional responses of, C., septempunctata L. to prey on nymphae Stephanitis anagustata Bu. sp. nov were studied initially in labortatory under natural temperature. The research results show that the functional responses of the predators to the prey can be described by the models of Holling Ⅱ . With the increasing density of the nymphae Stephanitis anagustata Bu. sp. nov,the prey amount was promoted gradually and the maximum quantity reached 370. 4. Nymphae Stephanitis anagustata Bu. sp. nov was the most favorite food of Ladybird,the interaction between the efficiency of pray and individual could be fitted by Hassell Model and the interaction coefficient was 0. 076 9,the functional responses of the imago to the density of themselves could be fitted by Watt model and the coefficient was 0. 694 0.