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Seasonal variation in nutritional levels of male tsetse flies Glossina morsitans morsitans (Diptera: Glossinidae) caught using fly-rounds and electric screens

Published online by Cambridge University Press:  09 March 2007

P. Van den Bossche  and
J.W. Hargrove
P. Van den Bossche*
Affiliation:
Regional Tsetse and Trypanosomiasis Control Programme, Box A560, Avondale, Harare, Zimbabwe
J.W. Hargrove
Affiliation:
IPMI Tsetse Research Project, Harare, Zimbabwe
*
* Fax: (263 4) 722684 E-mail: petervdb@rttcp.org.zw
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Abstract

A total of 4420 male Glossina morsitans morsitans Westwood were captured on man fly-rounds in Katete District, Eastern Province, Zambia between February 1991 and December 1993. Of these flies, 1680 were captured before June 1992, during which period 989 flies were also captured on odour-baited electric screens operated in the same area. Non-teneral flies were analysed for fat, haematin and residual dry weight and their wing-vein length was measured. There were well marked annual cycles in wing length, fat and residual dry weight. Flies were biggest at the end of the rainy season, and smallest at the end of the hot dry season. Fat levels were lowest before the onset of the rains and highest in the cool season. Residual dry weight was a function of haematin content and the degree of wing-fray; these factors were used to correct the residual dry weight to zero haematin. Corrected residual dry weight and wing-vein lengths were most highly correlated with relative humidity in the month prior to capture (r > 0.8 and 0.6 respectively). Correlations with saturation deficit were weaker; temperature accounted for <20% of the variance. Fly-round flies had a consistently higher residual dry weight than those from the electric screen, but their fat levels were lower. The distributions of log haematin levels differed little between the two sampling methods and were adequately described by a model where capture and feeding rates increased exponentially after each meal. The increase in the feeding rate after each meal differed little with season and was closely similar to that estimated for female G. pallidipesAusten in Zimbabwe.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 4 , April 1999 , pp. 381 - 387
Copyright
Copyright © Cambridge University Press 1999

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References

Bursell, E. (1961) Post-teneral development of the thoracic musculature in tsetse flies. Proceedings of the Royal Entomological Society of London, (A) 36, 69–74.CrossRefGoogle Scholar
Dixon, W.J. (Ed.) (1992) BMDP statistical software. Los Angeles, University of California Press.Google Scholar
Dransfield, R.D., Brightwell, R., Kiilu, J., Chaudhury, M.F. & Adabie, D.A. (1989) Size and mortality rates of Glossina pallidipes in the semi-arid zone of southwestern Kenya. Medical and Veterinary Entomology 3, 83–95.CrossRefGoogle ScholarPubMed
Hargrove, J.W. (1980) Improved estimates of the efficiency of traps for Glossina morsitans morsitans Westwood and G. pallidipes Austen (Diptera, Glossinidae), with a note on the effect of the concentration of accompanying host odour on efficiency. Bulletin of Entomological Research 70, 579–587.CrossRefGoogle Scholar
Hargrove, J.W. (1991) Ovarian ages of tsetse flies (Diptera: Glossinidae) caught from mobile and stationary baits in the presence and absence of humans. Bulletin of Entomological Research 81, 43–50.CrossRefGoogle Scholar
Hargrove, J.W. (1999a) Nutritional levels of female tsetse Glossina pallidipes from artificial refuges Medical and Veterinary Entomology 13, 150–164.CrossRefGoogle ScholarPubMed
Hargrove, J.W. (1999b) Lifetime changes in the nutritional characteristics of female tsetse Glossina pallidipes caught in odour-baited traps. Medical and Veterinary Entomology 13, 165–176.CrossRefGoogle ScholarPubMed
Hargrove, J.W. & Packer, M.J. (1993) Fat and haematin contents of male tsetse flies Glossina pallidipes and G. m. morsitans (Diptera: Glossinidae), caught in odour-baited traps and artificial refuges. Bulletin of Entomological Research 83, 29–46.CrossRefGoogle Scholar
Jackson, C.H.N. (1946) An artificially isolated generation of tsetse flies (Diptera). Bulletin of Entomological Research 37, 291–299.CrossRefGoogle ScholarPubMed
Jackson, C.H.N. (1953) Seasonal variation in the mean size of tsetse flies. Bulletin of Entomological Research 43, 703–706.CrossRefGoogle Scholar
Langley, P.A., Hargrove, J.W. & Wall, R.L. (1990) Maturation of the tsetse fly Glossina pallidipes (Diptera: Glossinidae) in relation to trap-orientated behaviour. Physiological Entomology 15, 179–186.CrossRefGoogle Scholar
Loder, P.M.J., Hargrove, J.W. & Randolph, S.E. (1998) A model for blood meal digestion and fat metabolism in male tsetse flies (Glossinidae). Physiological Entomology 23, 43–52.CrossRefGoogle Scholar
McCabe, C.T. & Bursell, E. (1975) Interrelationships between amino acid and lipid metabolism in the tsetse fly, Glossina morsitans. Insect Biochemistry 5, 781–789.CrossRefGoogle Scholar
Newberry, K. (1978) Seasonal variations in populations of Glossina morsitans centralis Machado (Diptera, Glossinidae) sampled at deflying pickets in Zambia. Zambia Journal of Science and Technology 3, 35–41.Google Scholar
Randolph, S.E. & Rogers, D.J. (1978) Feeding cycles and flight activity in field populations of tsetse (Diptera: Glossinidae). Bulletin of Entomological Research 68, 655–671.CrossRefGoogle Scholar
Rogers, D.J. (1984) The estimation of sampling biases for male tsetse flies. Insect Science and its Application 5, 369–373.Google Scholar
Shereni, W. (1984) The use of cloth screens and acetone vapour as alternatives to a bait-ox for sampling populations of tsetse flies (Diptera: Glossinidae). Transactions of the Zimbabwe Scientific Association 62, 22–27.Google Scholar
Vale, G.A. (1974a) New field methods for studying the response of tsetse flies and other Diptera. Bulletin of Entomological Research 64, 199–208.CrossRefGoogle Scholar
Vale, G.A. (1974b) The responses of tsetse flies (Diptera: Glossinidae) to mobile and stationary baits. Bulletin of Entomological Research 64, 545–588.CrossRefGoogle Scholar