饥饿对七星瓢虫捕食作用的影响

通过不同饥饿程度七星瓢虫雌、雄成虫对麦二叉蚜捕食作用的研究，得出：①饥饿不能改变七星瓢虫雌、雄成虫捕食作用的功能反应类型；②七星瓢虫雌、雄成虫间在各种饥饿条件下的捕食量差异均不显著；③七星瓢虫雌、雄成虫对麦二叉蚜的捕食量（Ｎａ）随着时间（ｔ）的变化，其模型分别是Ｎａ＝９０／１＋ｅ０．９４５３４－０．１５７４５ｔ和Ｎａ＝９０／１＋ｅ０．８７２８５－０．１２９８５ｔ；④七星瓢虫雌、雄成虫之间在２４ｈ内的捕食速度（Ｖ）差异不显著，其与时间段（ｘ）关系的模型分别为Ｖ＝８．３５５９ｘ－１．２４６０和Ｖ＝４．３４８７ｘ－０．５９６４。

A STUDY ON PREDATION OF Coccinella septempunctata ON DIFFERENT RANGES OF STARVATION

Coccinella septempunctata adults on various ranges of starvation preying on Schizaphis graminum was studied.The results was as follows: (1)The functional reactive types of C.septempunctata adults on various range of starvation had no difference; (2)The predacious number of C.septempunctata adults on S.graminum had no difference in various starving conditions; (3)The predacious number ( Na ) of C.septempunctata adults on S.gramiunum had a variation with time ( t )as shown in the models: Na =90/(1-e 94534-0 15745 t )and Na =90/(1-e 0 87285-0 12985 t )respectively; (4)The predacious rate ( V ) of C.septempunctata adults on S.graminum had no significance difference in 24 hours,the models on the relationship between predacious number and time ( x ) shown as: V =8 3559 x -1 2460 and V =4 3487 x -0 5964 ,respectively.