The magnitude of seasonal changes in larval populations of Aedes aegypti in Bangkok, Thailand.

Weekly surveys of Aedes aegypti larvae were made during 1966-67 in three localities in Bangkok in order to detect and measure any changes in the population which might be correlated with the seasons. The larval habitats were divided into water-jars and miscellaneous containers. Only the data from alternate weekly surveys were analysed. Analysis of variance showed that the changes in the numbers of habitats occupied varied greatly both by month and by locality. It is concluded that there was some reduction in the larval population during the cool and hot seasons and that the magnitude and timing of the fall varied from place to place. The reduction was of the order of 11%-26%. Local environmental changes, as well as climatic changes, greatly influenced the Ae. aegypti population.