【摘要】 在重庆地区的自然条件下,观察李拭库蠓血液消化和卵巢发育间的关系及寄生虫感染和卵巢发育间的关系。李拭库蠓雌虫并不滞育,冬季也不发生脂肪的积聚;除了1—2月间较短时期外经常吸血和产卵。在繁殖期内生殖营养环具有二次以上的重复现象。生殖营养协调、失调和生殖营养分解率,各占全年总剖检数的98.063％;1.23％和0.70％。生殖营养失调和分解现象几乎全年均能查见。 李拭库蠓有三种寄生虫感染;它们是体外寄生性螨类,体内寄生的原生动物——小袋纤毛虫和嗜虫性线虫——铁线虫。铁线虫感染,可在雌虫的不同年龄和生理龄期中发生。铁线虫是一种病原体,使雌虫卵巢退化和萎缩,引起昆虫宿主的不育。不育现象不受铁线虫数量、发育期(成虫、幼虫)和性别的影响。更多还原

【Abstract】 An investigation on the relation between blood digestion and ovarian development and the influence of its parasites on the reproduction in the blood-sucking midge Culicoides riethi Kieffer in Chungking was carried out during 1960 to 1962.Fat reserves were not found in females in winter months,and blood feeding and oviposi-tion were continuous except in a short period from January to February.Except in January there are at least two recurrences of the gonotrophic cycle in every month.Out of 5,112 adult females dissected monthly from July,1960 to June,1961,5,015 (98.06%) showed the existence of gonotrophic harmony and 63 (1.23%) showed disharmony.However,gonotrophic dissociation was-also noticed in 36 females (0.70%).The phenomena of gonotrophic disharmony and dissociation appeared almost in every month.There were three species of parasites of Culicoides riethi in Chungking:an.ectoparasitic mite,an endoparasitic ciliate (Blantidium sp.) and an entomorphilic nematode belonging to Mermithidae.Female midges in different developmental stages and physiological conditions were observed to harbour the mermithid nematodes which caused ovarian degeneration and sterilization of the females.In the sterilized female midges the nematodes may differ in number,sex and developmental stages.更多还原