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Local variation in the population dynamics of Glossina palpalis palpalis (Robineau-Desvoidy) (Diptera: Glossinidae). I. Natural population regulation

Published online by Cambridge University Press:  10 July 2009

David J. Rogers ,
Sarah E. Randolph  and
Felix A. Kuzoe
David J. Rogers
Affiliation:
Department of Zoology, South Parks Road, Oxford, UK
Sarah E. Randolph
Affiliation:
Department of Zoology, South Parks Road, Oxford, UK
Felix A. Kuzoe
Affiliation:
Trypanosomiasis Applied Research Project, B.P. 1425, Daloa, Ivory Coast
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Abstract

Based on data collected during regular, biconical trap sampling of Glossina palpalis palpalis (R.-D.) over two and a half years during and after two insecticide programmes in Ivory Coast, various analytical techniques were developed which allow the estimation of mortality rates and life-time fertility from ovarian age distributions of female flies. Data from trapping-out experiments were used to calculate the natural resilience of local populations. The results reveal that the dynamics of the populations showed considerable local variation, with two major types of sites. At those sites with large numbers of domestic pigs, the fly population was dense and showed a high degree of natural resilience and a low mean mortality rate, so that it could be selfsustaining through reproduction alone. At sites with few pigs, the fly population was scarce and showed a lower degree of natural resilience and a higher mean mortality rate such that the population could only be maintained by continuous input of immigrant flies. Studies of the natural dynamics of tsetse can be used to predict the likely effectiveness of alternative control schemes; fly mortality rates must be permanently increased in order to reduce fly numbers or infection rates to below some threshold for disease transmission.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 74 , Issue 3 , September 1984 , pp. 403 - 423
Copyright
Copyright © Cambridge University Press 1984

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