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Seasonal changes in populations of phlebotomine sandflies (Dipt., Psychodidae) in Kenya

Published online by Cambridge University Press:  10 July 2009

D. M. Minter
D. M. Minter
Affiliation:
Division of Insect-borne Diseases, Medical Research Laboratory, Nairobi, Kenya
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Extract

An account is given of seasonal changes in the incidence and relative abundance of a number of Phlebotomine sandflies which rest in termite hills in two widely separated areas of Kenya.

The annual pattern of rainfall distribution is shown to be of greater importance than the total precipitation in influencing the gross distribution and local abundance of many sandflies.

Kenya sandflies fall readily into ‘ perennial ’ and ‘ rainy-season ’ groups: the former have a wide distribution and appear to breed throughout the year. The distribution of the ‘ rainy-season ’ sandflies is relatively restricted, since these species are found almost exclusively in areas with a bimodal pattern of annual rainfall; it is suggested that they may survive the intervening dry periods in larval diapause. The length rather than the severity of the dry seasons is thought to be the limiting factor in the distribution of ‘ rainy-season ’ species.

Examples are given of the seasonal changes in structure of populations made up of several species sharing, in the adult form, the same termite-hill habitat.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 55 , Issue 3 , December 1964 , pp. 421 - 435
Copyright
Copyright © Cambridge University Press 1964

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