Irving-Bell R J, Inyang E N, Tamu G
Department of Zoology, University of Jos, Plateau State, Nigeria.
Trop Med Parasitol. 1991 Mar;42(1):63-6.
When granite rockpools are artificially flooded during the long (4-5 months) dry season, Aedes vittatus larvae appear. The source of these, whether from gravid females or from eggs surviving in a desiccated state, was tested for by sealing 8 rockpools with plastic mesh screening after the last rains. Two pools yielded Ae. vittatus and Ae. aegypti larvae after the first rain 4.5 months later, during which dry season soil temperatures reached 40 degrees C and air relative humidity fell as low as 5%. A laboratory experiment showed that Ae. vittatus did not oviposit through plastic mesh screening and therefore the larvae which appeared were from eggs present before the pools were screened. Known numbers of Ae. vittatus eggs laid on damp mud were placed in dry rockpools for 10 weeks and kept dry for a further 6 weeks in the laboratory. This resulted in a 7% hatch rate compared to 44% in the laboratory control and 79% in freshly laid eggs. It is concluded that the survival of Ae. vittatus eggs over the dry season is sufficient to lead to a rapid population explosion when the rains start.
在漫长的旱季（4 - 5个月）人为淹没花岗岩岩石池时，会出现白线伊蚊幼虫。为了测试这些幼虫的来源，是来自孕卵雌蚊还是以干燥状态存活的卵，在最后一场雨后用塑料网筛封闭了8个岩石池。4.5个月后的第一场雨后，有两个池出现了白线伊蚊和埃及伊蚊幼虫，在此旱季期间，土壤温度达到40摄氏度，空气相对湿度低至5%。一项实验室实验表明，白线伊蚊不会通过塑料网筛产卵，因此出现的幼虫来自在池子被筛之前就已存在的卵。将已知数量产在潮湿泥土上的白线伊蚊卵放置在干燥的岩石池中10周，然后在实验室中再保持干燥6周。这导致孵化率为7%，相比之下，实验室对照组为44%，新产的卵为79%。得出的结论是，白线伊蚊卵在旱季的存活足以在雨季开始时导致种群迅速激增。
