コガタアカイエカの生態,とくに吸血と産卵を中心にして

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  • Observations on the Habits of Feeding and Oviposition of <i>Culex tritaeniorhynchus</i> GILES
  • コガタアカイエカ ノ セイタイ , トクニ キュウケツ ト サンラン オ チュウシン ニ シテ

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Some ecological surveys and experiments on Culex tritaeniorhynchus GILES were carried out with 406 strain and wild-caught mosquitoes. The former strain has been established in the 406th Medical General Laboratory U.S. Army, Atsugi, Japan and the latter was collected with a light trap at a pigpen in the suburb of Yokohama. The average number of eggs per raft collected from July to September 1966 was 207.2 eggs, while 406 strain, when fed on mice, laid 172.3 eggs which was significantly less than the former. However, the hatching rates of egg batches of both groups were same, being 94% in fifty rafts counted. In a test using 406 strain mosquitoes, the number of eggs per raft decreased at the rate of about 15% in each gonotrophic cycle, namely 174.1, 148.9 and 126.7 eggs per raft for three successive cycles respectively. In the rearing cabinet (27°C, RH 80%), some of the females of 406 strain mosquitoes were able to repeat four gonotrophic cycles for about 25 days. The parous rates of the wild mosquitoes were checked from April to October in 1966. It was 16.2% in April and 10.6% in May and these were the lowest throughout the season. In June, July and August the parous individuals increased more than those in the previous two months and the rates were calculated as 31.0%, 35.4%, and 32.9%, respectively. From September to October, the wild female population became rapidly older as compared with the preceding months, being the parous rates 57.7% and 92.8% respectively. By age-grouping method, the parous mosquitoes from the field were found to have either one, two or three relics and among them uniparous females accounted for 94.9% of all parous ones. However, it is very probable that there were more biparous or triparous females, since many engorged individuals were usually found in the parous female populations. From these results, it was suggested that the hibernating adult females should be developed since early September and most of them did not fly to the host-sheds but migrated toward other hiding places to hibernate, although some of the female adults which engorged and laid egg-rafts during September and October would also possibly survive until the following spring, especially in the south of Japan.

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