两种生态型空心莲子草对莲草直胸跳甲发育和繁殖的影响

The effects of feeding on different ecotypes of Alternanthera philoxeroides on the development and reproduction of Agasicles hygrophila

【目的】评价空心莲子草Alternanthera philoxeroides 2种生态型食物对莲草直胸跳甲Agasicles hygrophila生长发育和繁殖的影响。【方法】建立莲草直胸跳甲在水生型和旱生型空心莲子草上的实验种群两性生命表。【结果】2种生态型空心莲子草对莲草直胸跳甲2龄和3龄幼虫的历期、产卵前期、产卵期、雌虫寿命、雄成虫寿命和繁殖力的影响无显著差异,但取食水生型空心莲子草的莲草直胸跳甲具有较短的蛹历期(6.28 d)、较高的幼虫期存活率(99.00%)和较高的成虫前期存活率(95.00%);取食旱生型空心莲子草的莲草直胸跳甲在内禀增长率和周限增长率都显著低于水生型食物,但莲草直胸跳甲的净增殖率(R_(0))和平均世代周期(T)在旱生型和水生型食物间并无显著差异。【结论】与旱生型空习莲子草相比,水生型空心莲子草是莲草直胸跳甲的较适宜食物,但旱生型空心莲子草并不显著影响莲草直胸跳甲的发育和繁殖。

[Objectives]To evaluate the effects of feeding on different Alternanthera philoxeroides ecotypes on the development and reproduction of Agasicles hygrophila.[Methods]We compiled a TWO-Sex life table for A.hygrophila fed on different ecotypes of A.philoxeroides.[Results]A.philoxeroides ecotype had no significant effect on the duration of the 2nd and 3rd larval instars,female longevity,male longevity or fecundity,of A.hygrophila.However,A.hygrophila that fed on the aquatic ecotype of A.philoxeroides had a shorter pupal developmental duration(6.28 d),higher larval survival(99.00%)and higher pre-adult survival(95.00%),than those fed on the terrestrial ecotype.Moreover,A.hygrophila that had fed on the terrestrial ecotype of A.philoxeroides had significantly lower intrinsic and finite rates of increase than those that had fed on the aquatic ecotype.Prey ecotype had no significant effect on either net growth rate(R_(0))or mean generation time(T).[Conclusion]A.hygrophila that fed on the aquatic ecotype of A.philoxeroides had faster pupal development,higher larval survival and higher pre-adult survival than those that fed on the terrestrial ecotype.The development and reproduction of A.hygrophila were not,however,significantly affected by feeding on the terrestrial ecotype of A.philoxeroides.