影响布氏潜蝇茧蜂子代性比的因素

布氏潜蝇茧蜂可以寄生不同龄期的橘小实蝇幼虫,寄生蜂子代雌蜂率随寄主龄期的增加而升高,寄生4日龄寄主时,其子代雌蜂率为58.27%,而寄生1日龄寄主时,其子代雌蜂率仅为15.29%。在不同寄生蜂密度条件下,雌蜂比率随寄生蜂密度的增加不断下降,20只寄生蜂存在时,其子代雌蜂率只有24.32%,而供1只寄生蜂寄生时,其子代雌蜂率可达53.65%。寄生蜂在羽化后5 d产卵寄生时,其子代雌蜂率为31.97%,10 d时雌蜂率为44.39%,随着寄生蜂龄期的增加雌蜂率逐渐升高,10-30 d子代雌蜂率无显著差异。寄生蜂在35℃时产卵会影响其子代雌蜂比率,15℃条件下产卵与正常温度相比子代性比无显著差异。供给寄生蜂不同食物,不影响寄生蜂子代的雌性比率。

Impact factors determining offspring sex ratio of Fopius vandenboschi

Fopius vandenboschi(Fullaway) operated as a parasite of Bactrocera dorsalis(Hendel) larval at various ages,the female sex ratio of F.vandenboschi emerging from parasitized 4-day-old hosts was 58.27%,and that from 1-day-old hosts was 15.29%.The female sex ratio of progeny increased as the age of the host increased.The female sex ratio decreased with increasing wasp density,B.dorsalis larvae were exposed to 20 parasitoids produced progeny with the smallest female sex ratio 24.32%.Whereas the greatest female sex ratio 53.65% was obtained for those exposed to 1 parasitoid.The female sex ratio of progeny was 31.97% when hosts parasitoid by females aged 5 days,parasitoid by females aged 10 days was 44.39%.The female sex ratio rose as the age of the female wasps increased.But the sex ratio varied in significantly among progeny produced by females aged 10 to 30 days.A high temperature(35 ℃) affected the female sex ratio of the progeny of F.vandenboschi,but there was no effect at 15 ℃.No distinction was found in the female sex ratio of the progeny from female parasitoids depending on varied foods.