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Reproductive status, catch and age compositions of a natural population of Glossina morsitans submorsitans in Bahr El Arab fly belt, Sudan

Published online by Cambridge University Press:  19 September 2011

M. M. Mohamed-Ahmed ,
E. I. Abdel Karim  and
A. H. A. Rahman
M. M. Mohamed-Ahmed
Affiliation:
Veterinary Research Administration, P.O. Box 8067, El Amarat, Soba, Khartoum, Sudan
E. I. Abdel Karim
Affiliation:
Veterinary Research Administration, P.O. Box 8067, El Amarat, Soba, Khartoum, Sudan
A. H. A. Rahman
Affiliation:
Veterinary Research Administration, P.O. Box 8067, El Amarat, Soba, Khartoum, Sudan
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Abstract

Studies were conducted during the dry period February to May 1986 in River Shelliekha, Bahr El Arab fly belt, Sudan, to obtain baseline data on catch and age compositions, reproductive status and trypanosome infection rates of trapped and fly round samples of Glossina morsitans submorsitans. The objective was to assess the tsetse situation before the establishment of trypanosomiasis treatment stations at the northern limits of the fly belt. Trapped tsetse included significantly higher proportions of teneral and non-teneral females and a lower male:female ratio. Insemination rates were over 98% in both samples. In any one group, the frequency of pregnancy with egg predominated, followed by the second, first and lastly the third instar larva. There were significant differences between the two groups of females in the proportions of nullipars and pregnancy with any one of the larval instars. Abortion was the predominant reproductive abnormality and no relationship could be found between abortion rate and the sampling method, age or trypanosome infection rate of females. Age compositions were similar in the two samples, save for age categories 0 and 1 for females and two and four for males. Flies were infected with Trypanosoma vivax and T. congolense only, though T. brucei infections could also be diagnosed in livestock.

Résumé

Des études ont été conduites durant la aison séche de Févier à Mai 1986, sur la riviére Shelliekha, dans la ceinture de mouches tsé-tsé de Bahr El Arab au Soudan, en que d'obtenir des données de base sur la capture et la composition en âges, sur la reproductivité et le taux d'infection au trypanosome par les mouches, Glossina morsitans submorsitans, capturées par piégeage et par écrans attractifs. L'objectif du travail était d'estimer la population de la mouche tsé-tsé avant d'installer des stations de traitement de trypanosome dans le nord de la ceinture de mouches. Les mouches tsé-tsé capturées comprenaient un nombré élevé de mouches àjeun et de femelles adultes et une faible proportion mâle:femelle. Les taux d'insémination étaint supérieurs à 98% dans les deux types d'echantillonnage. La fréquence de femelles gravides dans les deux groupes était prédominante, suivis par le second, premier et dernier stades larvaires. II y avait de différences significatives entre les femelles de deux groupes échantillonés en ce qui concerne le nombre d'individus n'ayant pas pondu les oeufs et les femelles gravides, quels que soient les stades larvaires. L'avortement etait I'anomalie de reproduction prédominante, aucun rapport n'a été trouvé entre le taux d'avortement et la technique d'echantillonnage, i'âge ou le taux d'infection au trypanosome par les femelles. La composition en âges etait identique dans les deux échantillons à l'exception de la categorie d'âge 0 et 1 pour les femelles, et deux quatre pour les mâles. Les mouches tsé-tsé étaient essentiellment infestées avec Trypanosoma vivax et T. congolense bien que l'infection à T. brucei a pu être diagnostiquée chez le bétail.

Keywords

Glossina morsitans submorsitanstrapsfly roundinseminationpregnancyabortionageTrypanosoma vivaxT. congolenseT. brucei
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 4 , August 1993 , pp. 445 - 453
Copyright
Copyright © ICIPE 1993

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