中红侧沟茧蜂逐日产卵规律及子代性分配

Daily Parasitizing Behavior and Progeny Daily Sex Allocation of Microplitis mediator

研究了中红侧沟茧蜂在一定的人工繁殖条件下,雌蜂的逐日产卵规律及子代逐日性分配规律.结果表明,成虫羽化后无论交配与否当天均可产卵.如果不进行交配,则进行孤雌产雄生殖.在22±1.5℃、湿度40%～60%、光照强度4700～5100lx条件下,雌蜂寿命平均8.3d,产卵持续时间平均为7d,最长可连续产卵15d.单雌产卵量平均84.4粒,最高可达231粒.中红侧沟茧蜂单雌日产卵量与雌蜂日龄有密切的关系,1～12日龄7.8～17.4粒;13～15日龄1.3～5.0粒;15d时,雌蜂死亡率达90%,存活雌蜂不再产卵.在整个产卵期,中红侧沟茧蜂子代逐日性分配呈现雌性比例逐渐降低的趋势.雌雄比在第1～3d,处于1.36～1.59∶1之间;第4～8d在0.79～1.12∶1之间;9d以后下降为0～0.60∶1.

The pattern of laying egg and progeny sex allocation of Microplitis mediator were studied in laboratory. The results showed that females could oviposit at the day of their emergence despite having mated or not. If they did not mate the female would make arrhenotokous parthenogenesis. Under the condition of temperature 22 ± 1.5℃, RH 40% - 60%, light intensity 4700 - 5100lx, the average life span of females was 8.3 d, the average persisting time of egg-laying was 7 d and the longest time could reach 15 d. The average number of eggs produced by one female was 84.4 and the maximum number was 231. Number of eggs produced daily by one female was significantly related to the age of the female. From the 1st - 12th days, average number of eggs produced per day by one female was 7.8 - 17.4. Afterward the number reduced to 1.3 - 5.0. The 90% female died after 15 d and the survivals could not oviposit any more During the oviposition of M. mediator, daily sex allocation of the progeny decreased gradually The sex ratio were 1.36 - 1.59： 1 within the first 3 days, 0.79 - 1.12：1 within the 4th to 8th day, after 9th day, non-femal occured.