三带喙库蚊和淡色库蚊滞育反应的对比研究

COMPARATIVE STUDIES ON DIAPAUSE RESPONSES BETWEEN CULEX TRITAENIORHYNCHUS AND CULEX PIPIENS PALLENS

从已知就地越冬的淡色库蚊和尚未明确如何越冬的三带喙库蚊的滞育反应比较中发现:两种滞育蚊的卵巢滞育指标、中肠变化和拒绝吸血均较一致。但三带喙库蚊滞育后体重和脂肪含量的增加和耐寒力均不及滞育淡色库蚊,其临界光周期日期比淡色库蚊提前20d,临界光周期前后的生殖营养分离远较淡色库蚊多见,并和淡色库蚊不同,在自然界临界光周期后极不易获得滞育蚊.尚对三带喙库蚊季节迁飞的可能性作了讨论。

By comparing the diapause responses between locally hibernating species, C. piptens pallens, and C. tritaeniorhynchus the overwintering way of which is yet unknown, we found the relative identities of these 2 species in their ovarian diapause criteria, change of the mid-gut and the behaviour of refusing blood feeding. The increases in body weight and fatty contents in the diapaused tritaeniorhynchus were much less than those in diapaused pipiens species. Moreover, their ability to resist low temperature was also found significantly weaker. In Shanghai area, the date of the critical photoperiod for C. tritaeniorhynchus was found around the 25th of September with a daylight exposur-length (including twilight) of about 13 hours and 43 minutes, being 20 days earlier than that of the locally hibernating species C. pipiens pallens. The gonotrophic dissocia-tion during critical photoperiod occurred more frequently in tritaeniorhynchus than in pipiens mosquitoes. In contrast to pipiens species, it is extremely difficult to obtain diapaused tritaeniorhynchus in nature post critical photoperiod. The possibility of a seasonal migrative behaviour of C. tritaeniorhynchus was discussed.