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The rise and fall of Anopheles arabiensis (Diptera: Culicidae) in a Tanzanian village

Published online by Cambridge University Press:  10 July 2009

J.D. Charlwood ,
J. Kihonda ,
S. Sama ,
P.F. Billingsley ,
H. Hadji ,
J.P. Verhave ,
E. Lyimo ,
P.C. Luttikhuizen  and
T. Smith
J.D. Charlwood
Affiliation:
Ifakara Centre, Tanzania & Department of Entomology, Wageningen Agricultural University, The Netherlands
J. Kihonda
Affiliation:
Ifakara Centre, Tanzania
S. Sama
Affiliation:
Ifakara Centre, Tanzania
P.F. Billingsley
Affiliation:
Department of Biology, Imperial College of Science, Technology and Medicine, London, UK
H. Hadji
Affiliation:
Ifakara Centre, Tanzania
J.P. Verhave
Affiliation:
Department of Medical Microbiology, University of Nijmegen, The Netherlands
E. Lyimo
Affiliation:
Ifakara Centre, Tanzania & Department of Entomology, Wageningen Agricultural University, The Netherlands
P.C. Luttikhuizen
Affiliation:
Department of Animal Taxonomy, Wageningen Agricultural University, The Netherlands
T. Smith*
Affiliation:
Department of Public Health & Epidemiology, Swiss Tropical Institute, Basel, Switzerland & Ifakara Centre, Tanzania
*
Dr. T. Smith, Dept. Public Health & Epidemiology, Swiss Tropical Institute, PO Box, CH-4002 Basel, Switzerland.
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Abstract

The continual recruitment of new individuals makes it difficult to study both the survival of multivoltine mosquitoes, and the size of the infectious reservoir in narural populations of malaria vectors. During long-term surveillance of a population of Anopheles gambiae Giles sensu lato in a Tanzanian village by daily light trapping, a temporary dry spell resulted in the cessation of recruitment for a period of 33 days, and a decline in numbers of A. arabiensis Patton caught from over 2000 to less than 10 in a sentinel house. Traps placed elsewhere in the village indicated similar proportionate declines although numbers caught varied according to location. A survival rate of 83% per day was estimated from the rate of population decline. Survival was unrelated to the size of the mosquitoes. The infectious reservoir (the chance of a mosquito acquiring an infection) was estimated to be 2% per feed. The exploitation of fortuitous events which temporarily eliminate a single stage in the life cycle has general applicability in the study of the bionomics of multivoltine insects.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 85 , Issue 1 , March 1995 , pp. 37 - 44
Copyright
Copyright © Cambridge University Press 1995

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