Observations on the multiple gonotrophic cycles completed by Simulium takahasii (Diptera: Simuliidae) in the laboratory.

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The newly-emerged females of the anautogenous blackfly, <I>Simulium (Wilhelmia) takahasii</I> (Rubtsov), were allowed to mate, feed on human blood and oviposit in the laboratory with an attempt to complete the multiple gonotrophic cycles. As a result, 85 of 87 inseminated flies which were fed on the blood and maintained at various constant temperatures (12°C to 28°C) oviposited, and the duration from blood feeding to oviposition tended to shorten with an increase of maintaining temperatures (i.e. median length, from 5.5 days at 12°C to 1.9 days at 26°C). The gap in time from the completion of oocyte development to oviposition gradually widened as the temperature lowered. Out of 85 flies ovipositing the first batch ofeggs, 20 were fully fed on the second blood within 17 hours, and subsequently deposited eggs. Moreover, 3 of these 20 flies took the third blood and 2 of them oviposited. The lengths ofduration from blood feeding to oviposition in the second and third gonotrophic cycles were 1.17 and 1.40 times as long as that in the first cycle, respectively. The mean number of eggs matured per fly reduced in the second and third gonotrophic cycles, as compared to that in the first. A single insemination has proved to enable this blackfly to produce fertile eggs at least over the first 3 gonotrophic cycles.
日本熱帯医学会の論文