龟纹瓢虫残食同种卵行为的研究

本文初次研究了龟纹瓢虫残食同种卵的行为。结果表明:龟纹瓢虫幼虫和成虫均有明显的残食同种卵行为。初孵幼虫取食2粒卵即可完成一龄发育,但生存时间明显延长。以其卵作食料可完成幼虫发育,但发育历期较慢;成虫残食同种卵则无生殖能力。因此认为,当自然界缺乏猎物时,龟纹瓢虫卵可作为增加它的生存机会及种群延续的一种替换食料。这种残食同种卵行为对于种群自我调节和繁衍有着重要的生物学意义。

STUDIES OF THE BEHAVIOUR OF THE LADYBIRD BEETLE PROPYLEA JAPONICA FEEDING ON EGG CANNIBALISM

The feeding behaviour of propylea japonica(Thunberg)on same species eggswas first studied and comparisions were made on the effects of those eggsas foods laid by Coccinella septempunctata,Harmonia axyridis and the eggs ofthe same kind on larval development and adult fecundity in laboratory.Theresults indicated that larva and adult of the ladybeetle prefere towards itseggs of the same kind.The newly hatched larva eating two eggs was enoughto develop into second-instar stage but the developmental duratlon wasapparently longer.The Whole larval development could be completed when onlyfed on eggs cannibalism,but the duration of growth became prolonged.Theadult showed no fecundity.The conclusion can be,therefore,drawn that onegg cannibalism as a substitute food for increasing the survival chance andpreserving the species while lack of prey in nature is considered of greatsignificance in self-regulation and population reproduction.