红彩真猎蝽对斜纹夜蛾和烟青虫的捕食功能反应

Predation of Harpactor fuscipes on Helicoverpa assulta and Spodoptera litura

在室内条件下研究了红彩真猎蝽雌成虫对斜纹夜蛾和烟青虫2龄幼虫的捕食作用和种内干扰作用。结果表明,红彩真猎蝽雌成虫的捕食量随着斜纹夜蛾和烟青虫幼虫的密度增加而增大,其捕食功能反应符合Holling II型方程,红彩真猎蝽对斜纹夜蛾2龄幼虫的捕食量符合Na=0.4665Nt/(1+0.0036 Nt),对烟青虫2龄幼虫的捕食量符合Na=0.4275Nt/(1+0.0041Nt)。红彩真猎蝽的捕食作用有较强的种内干扰反应,捕食率与个体间相互干扰的关系符合Hassell模型,红彩真猎蝽的捕食量与害虫密度正相关,寻找效应与害虫密度负相关。

The predation of adult Harpactorfuscipes on the third instars of Helicoverpa assulta and Spodoptera litura was studied in laboratory. The results showed that the functional response of adults of It. fuscipes to the second instars of H. assulta and Sp.litura was fitted to Holling II-type equation,i.e. ,Na=0.4275Nt/（1 ＋0.0041Nt） on H. assuha,Na=0.4665Nt/（1 ＋0.0036 Nt） on Sp.litura. The predation capacity of H. fuscipes on H. assuha and Sp.litura was strongly interfered by its own density, and the re]~ationship between predation efficiency and intraspecific interference could be described with Hassell model. The predation rate ofH. fuscipes was positively related with prey densities, as its searching efficiency was negatively associated with prey densities.