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The dynamics of trypanosome infections in natural populations of tsetse (Diptera: Glossinidae) studied using wing-fray and ovarian ageing techniques

Published online by Cambridge University Press:  10 July 2009

S. G. A. Leak  and
G. J. Rowlands
S. G. A. Leak
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
G. J. Rowlands
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
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Abstract

Trypanosome infections in approximately 110,000 tsetse of 12 species or subspecies, at sites in six African countries, were studied over various periods from 1983 to 1994. Infection rates ranged from 0.2% in Glossina fuscipes quanzensis Pires at a site in Zaire, to 18% in Glossina tabaniformis Westwood at a site in Gabon. Statistical models were fitted to data for nine species or sub-species of tsetse (G. pallidipes Austen, G. morsitans morsitans Westwood, G. morsitans submorsitans Newstead, G. fuscipes fuscipes Newstead, G. fuscipes quanzensis Pires, G. palpalis palpalis Robineau-Desvoidy, G. palpalis gambiensis Vanderplank, G. tachinoides Westwood and G. tabaniformis Westwood), recorded across eight sites. The prevalence of mature trypanosome infections increased with age, as determined by wing-fray category, for both Trypanosoma vivax- and T. congolense-type infections, although for G. palpalis, G. tabaniformis and G. tachinoides the rate of T. vivax-type infections decreased in older age categories. Infection rates for T. brucei were very low and statistical analysis was not possible for this species. Overall prevalences of Trypanosoma vivax-type infections were significantly higher in female than male flies in four tsetse species; G. pallidipes, G. palpalis, G. tabaniformis and G. tachinoides. At sites where ovarian ages were also determined, close correlations between wing-fray category and ovarian age were found.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 87 , Issue 3 , June 1997 , pp. 273 - 282
Copyright
Copyright © Cambridge University Press 1997

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