【摘要】 以米蛾卵作为繁育寄主,通过系统解剖不同发育期(0~144h)玉米螟赤眼蜂的卵巢,探讨了雌蜂抱卵量、繁殖力与其年龄和个体大小之间的关系。结果表明,玉米螟赤眼蜂在羽化初期(0~3h),卵巢中只有部分卵处于成熟状态,随着雌蜂年龄的增加,其抱卵量不断增加,至72h时接近其卵巢容纳量。抱卵量与雌蜂年龄之间的关系可以用以下公式来表示y=a{1-exp[-b(x+c)]}。用后足胫节长度(HTL)来表示雌蜂个体大小时,HTL短于0.150mm、介于0.150~0.159mm之间以及长于0.160mm的个体羽化后24h的平均抱卵量分别为40.4、50.5和58.2粒,各占其卵巢容纳量的72.8%、79.3%和86.9%,占整个成虫期总产卵量的49.4%、47.9%及51.9%。玉米螟赤眼蜂羽化后24h内的产卵量接近于羽化后24h的抱卵量。雌蜂个体大小与抱卵量及总产卵量之间关系密切,抱卵量与总产卵量随着雌蜂个体的增大而不断增加,呈线性正相关。个体大小可以作为评估玉米螟赤眼蜂生殖潜能高低的一个良好的指标。更多还原

【Abstract】 Relationships between female body size, egg load and fecundity of Trichogramma ostriniae Pang et Chen were analyzed through dissecting ovaries at different ages (0-144 h) of female wasps. The results showed that only a fraction of mature eggs were observed in ovaries at the early stage after emergence, however, egg load increased as the female age increased and almost corresponded to ovary storage capacity by 72 h of adult life. The dependence of egg load on age could be well described by the formula, y=a｛1-exp[-b(x+c)]｝. Female wasps with hind tibia length (HTL) shorter than 0.150 mm, between 0.150-0.159 mm and longer than 0.160 mm produced 40.4, 50.5 and 58.2 eggs in 24 h after emergence, respectively, accounting for 72.8%, 79.3% and 86.9% to their respective ovary storage capacity, corresponding to 49.4%, 47.9% and 51.9% of their respective total lifetime egg complement in the presence of unlimited hosts. On the first day of oviposition, the mean number of eggs laid was fairly close to the egg load. There was a significant positive linear relationship between egg load and female body size of T. ostriniae, so was between the female body size and lifetime fecundity.更多还原