作　　者： ; ; ; ; ;

机构地区： 华南农业大学

出　　处： 《生态学报》 2005年第1期73-77,共5页

摘　　要： 通过组建卷蛾分索赤眼蜂 Trichogrammatoidea bactrae Nagaraja在米蛾 Corcyra cephalonica(Stainton)卵上实验种群生命表的方法 ,考察了梯度恒温 17、2 0、2 3、2 6、2 9、32℃和 35℃对该蜂发育、存活和繁殖的影响。在试验温度范围内 ,卷蛾分索赤眼蜂的世代发育历期随着温度的升高而缩短 ,发育历期由 17℃时的 2 0 .77d降至 35℃时的 7.2 5 d。卷蛾分索赤眼蜂的临界发育温度为 11.92和 38.95℃ ,适宜的生长发育温区则介于 2 0～ 2 9℃之间 ,最适发育温度为 2 3.0 7℃。在适宜温度 (2 0～ 2 9℃ )范围内 ,卷蛾分索赤眼蜂的幼期存活率维持在 90 %以上 ,雌成蜂具有较长的寿命 ,7.6 7～ 10 .87d;内禀增长率 (rm)及净生殖力 (R0 ) ,分别介于 0 .2 395～ 0 .4 890和 4 2 .32～ 6 4 .2 3之间。极端温度对卷蛾分索赤眼蜂的生长发育和生殖均有明显的抑制作用 ,在 35℃时 ,其幼期存活率为 12 .98% ,雌成蜂寿命不足 1d,且不能进行正常的生殖活动。温度对卷蛾分索赤眼蜂的子代性比有着显著的影响 ,在 17～ 35℃范围 ,子代雌雄性比随着温度的升高而不断下降 ,17,2 0 ,2 3,2 6 ,2 9℃和 32℃时的子代雌雄性比分别为 6 .73,3.4 8,2 .88,2 .4 5 ,2 .4 1和 1.75 ,温度与子代性比的作用关系可用公式 s=exp(3.5 1- 0 .10? Trichogrammatoidea bactrae Nagaraja is a common indigenous natural egg parasitoid of the diamondback moth (DBM) in South China. It has been identified as the most suitable candidate to control DBM in laboratory studies in recent years. However, compared to Trichogramma little was known about the biology and ecology of the Trichogrammatoidea. In this paper the effects of seven constant temperatures on the reproductive potential of experimental populations of T. bactrae Nagaraja parasitizing eggs of Corcyra cephalonica(Stainton)was analyzed through life tables. In our experiment eggs of C. cephaloica were glued on paper cards (40mm×50mm) and were exposed for 1-hour to UV-Sterilization treatment. Each egg card was put inside a vial of size 32 mm×100 mm and exposed to the adult parasitoids for half hour at 26 ℃. The vials were then placed in each of seven constant temperature cabinets at (17±1), (20±1), (23±1), (26±1) (29±1), (32±1)℃ and (33±1) ℃, 14∶10 (L∶D) photoperiod and relative humidity 75 %. Development times from egg to adult, survival rates of immatures during development and emergence numbers each day were recorded. Thirty-fifty newly emerged and mated females 12-hours old from each temperature treatment were confined individually in 11 mm × 55mm vials and were exposed to the same constant temperatures. Sufficient numbers of host eggs (n>200 per female) were provided to the parasitoids every day. Daily fecundity, longevity of adults and sex ratio (females/males) of offspring were recorded. During the experiment 25% honey solution was stuck on the wall inside the vial to provide the parasitoids with nutrients. There were 3 replicates for each treatment.Development time of the immature stages decreased with an increase of temperature, 20.8d at 17℃ to 7.2 d at 35℃. The minimum and maximum temperatures for T. bactrae development were 11.9 and 38.9℃, respectively. Favorable temperature ranges for development and reproduction of T. bactrae were 20～29℃, with an immature survival r

关 键 词： 卷蛾分索赤眼蜂 温度 生命表 性比

领　　域： [生物学] [生物学] [生物学] [生物学]