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Seasonal population dynamics of the immature stages of Aedes africanus (Theobald) (Diptera: Culicidae) in Zika Forest, Uganda

Published online by Cambridge University Press:  10 July 2009

S. D. K. Sempala
S. D. K. Sempala
Affiliation:
Uganda Virus Research Institute, P.O. Box 49, Entebbe, Uganda
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Abstract

The seasonal population trends of the immature stages of Aedes africanus (Theo.), an important vector of yellow fever virus and other arboviruses, were studied in Zika Forest, Uganda, for two years during 1974–75. Data were collected from natural breeding places in tree holes and from bamboo pots placed 80 cm above the ground. Developing larvae and pupae were present at all times of year, and there were monthly, seasonal and annual fluctuations in density. These fluctuations followed the seasonal distribution of rainfall and were more marked in the natural breeding places, which were subject to irregular fluctuations in water level, than in the bamboo pots, which were constantly supplied with water. Thus, in addition to the drought-resistant eggs whose erratic hatching by instalments could ensure the presence of A. africanus throughout the year, there are probably also present at any given time females that are capable of ovipositing. As a measure of the seasonal population changes, it was found that both the percentage of positive containers index and the mean number per container index were almost equally sensitive.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 73 , Issue 1 , March 1983 , pp. 11 - 18
Copyright
Copyright © Cambridge University Press 1983

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