月斑虎甲对中华稻蝗的捕食作用

Predation of Cicindela lactescripta Motschulsky on Oxya chinensis(Thunberg)

在室内研究了月斑虎甲成虫(Cicindela lactescripta Motschulsky)对1、2龄中华稻蝗〔Oxya chinensis (Thunberg)〕的功能反应和种内干扰效应。结果表明,月斑虎甲对中华稻蝗的捕食功能反应均属于HollingⅡ型方程,方程分别为Na1=1.14Nt/(1+0.17814Nt)和Na2=1.01Nt/1+0.26886Nt)。月斑虎甲的捕食作用有较强的种内干扰反应,随着捕食者密度的增大,平均捕食量逐渐减少,捕食作用率也相应降低,捕食率与个体相互干扰的关系符合Hassell模型,拟合方程分别为E1=0.710840Pt-0.455081和E2=0.526348Pt-0.522152。模拟后各方程经过x2检验理论值与实测值差异不显著。

The functional response of Cicindela lactescripta Motschulsky adult to the first and second instar nymphs of Oxya chinensis （Thunberg） was investigated in the laboratory. The results showed that the functional responses of C. lactescripta to the first- and second-instar nymphs of O. chinensis fitted Holling Ⅱ type equation, which were Na1 = 1.14 Nt/（1 ＋ 0. 17814 Nt ） and Na2 = 1.01 Nt/（1 ＋ 0. 26886 Nt ）, respectively. Furthermore, obvious intraspecific interference was also found in the experiment, the average predation number, predation ratio（E） and natural enemy density（P） was described with Hassell model equations, namely E1 =0. 710840 Pt^-0.455081 （first-instar nymph） and E2 = 0. 526348 Pt^-0.522152 （second-instar nymph）, x^2 test showed that the theoretical expectation calculated fitted well with the observed value.