白纹伊蚊自然种群生命表研究

本研究设计了一套能排除外界新蚊卵产入的特定年龄生命表的研究方法。从1984年至1988年,共组建了15个自然种群生命表。通过生存曲线分析得出,在食物营养丰富生境下,曲线呈明显的上弓形,虫体大多活到生理寿命后死亡;而在食物营养贫乏生境下的生存曲线上弓形不明显,虫体在幼虫期便大量死亡。结合医学昆虫研究特点,采用上下代成虫数建立种群趋势指数,并提出两项趋势指数,较全面地揭示了种群的趋势动态。关键因子及虫期分析得出,种群关键虫期为3～4龄幼虫期,其次为1～2龄幼虫期,而食物营养因子是整个自然种群的关键因子。种群密度制约性分析得出,1～2龄幼虫致死因子的作用是密度制约的。

Studies on Life Table of the Natural Population of Aedes albopictus

A new method was designed to study age-specific life table of Aedes albopictus. Sixteen life tables of the natural population were made up from 1984 to 1988. According to the survivorship curve, the curve appears obviously upper bowshaped in the nourishing habitats, and most of the mosquitoes can finish physiolo gical life-span. On the other hand, the curve doesn't appear upper bow-shaped in the poor habitats, and the mosquitoes die greatly in larval stage. The adult number was used to observe and study population trend in the light of specific conditions of medical entomology, and two kinds of population trend index were put forward to reveal the population trend. According to analysis, the key phase of the population change is the 3rd-4th instar larvae and the 1st-2nd instar larvae take second place. The key factor caus-ing the population change is food nutrition factor. In addition, the factors causing death of 1st and 2nd instar larvae are density-dependent, and the rest are density-independent.