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Tsetse survey in Mukono district, south-east Uganda: Population structure, distribution and blood meal status

  • E. Katunguka-Rwakishaya
  • E. K. Kabagambe
Article

Summary

The population structure, feeding state and distribution of tsetse ofGlossina fuseipes fuscipes species in Ssugu parish of Mukono district, south-east Uganda were investigated. Tsetse caught with pyramidal traps were counted, sexed and dissected for age grading. It was observed that most tsetse were caught in valley habitats in the dry season, but the distribution was almost uniform within the parish in the wet season. The apparent density and prevalence of blood meals in tsetse fluctuated in different months. There were more males with a fresh blood meal than females (P < 0·05).

In the population there was a preponderance of young tsetse of less than 60 days. There were significantly more teneral males than teneral females ( P < 0·05). In all months the percentage of females was higher than that of males and ranged between 51·1% to 64·6 per cent. The epidemiological implications of these findings are that the risk of contracting trypanosomasis is high during the period of uniform distribution; since this is associated with an increase in apparent density and therefore high man-tsetse-animal contact. Furthermore, these results have shown that it is possible to prevent increase in the population of tsetse by applying insecticides on animals and targets in September and early October, since recruitment in tsetse population follows the rains.

Keywords

Blood Meal Trypanosomiasis Dicha Tsetse Population Blood Meal Size 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Etude des mouches tse tse dans le district de mukons au sud-est de l’Ouganda: Structure de la population, distribution et composition des repas de sang

Résumé

La structure de la population, l'habitude alimentaire et la distribution chez la moucbe tsé-tséGlossina fuscipes fuscipes dans la paroisse de Ssugu du district de Mukono au sud-est de l’Ouganda furent étudieés. Les mouches tsé-tsé attrapeés par des pièges pyramidaux furent comptées et disséquées pour con-naître leur âge, et les sexes furent répertoriés. La plupart des moucbes furent prises dans les valleys pendant la saison sèche alors que la distribution fut casi uniforme dans la paroisse pendant la saison humide. La densitè apparente et la prévalence des repas de sang cbez les mouches varièrent sur differents mois. Il y cut plus de mâles que de femelles avec des repas frais de sang (p < 0, 05).

Dans la population il y eut plus de mouches de moins de 60 jours. Il y eut de façon significative plus de mâles à jeun que de femelles (p < 0,05). Sur tous les mois le pourcentage de femelles fut supârieur à celui des mâ~les variant de 51,1% li 64,6%. Les répercussions épidémiologiques de ces observations montrent que les riques de contracter une trypanosomiase sont élevés pendant la période de distribution uniforme car ceci est relié avec l’augmentation en densité apparente, et de ce fait dans l’augmentation des contacts homme-mouche-animal. En outre ces résultats ont montré qu'il est possible de limiter l’accroissement de la popu-lation de mouche par l’application d’insecticides sur les animaux en septembre et au début d'octobre, car léessor de la population de mouche suit la période des pluies.

Estudio de la mosca tse-tse en el distrito de Mukono en el sudeste de Uganda: Estructura de la poblacion, distribucion y alimentacion

Resumen

Se investigó la estructura de la población, alimentación y distributción de la mosca tse-tseGlossina fuscipes fuseipes en la región de Ssugu, distrito de Mukono, sudeste de Uganda. Las moscas tse-tse capturadas con trampas de tipo piramidal fueron contadas, sexadas y diseccionadas con objeto de de-terminar su edad. Se observó queen la época seca la mayoría de las moscas fueron capturadas en valles, mientras que durante la época húmeda la distribución de los animales fue homogénea en toda la zona es-tudiada. La densidad aparente y la prevalencia de animales que habían ingerido sangre dependió del mes. El número de machos que habían ingerido sangre recientemente rue superior at de hembras en la misma situa-ción (p < 0·05).

Se encontró una preponderancia de animales jóvenes de menos de 60 días. El número de machos tener-ales rue significativamente superior al número de hembras tenerales ( p < 0·05). En todos los meses la edad percentual de las hembras fue superior a la de los machos y varió entre el 51·1%, y el 64·6%. Las implica-ciones epidemiológicas de estos resultados son que el riesgo de contraer tripanosomiasis es alto durante el período de distribución uniforme ya que dicha distribución se asocia con un aumento en la densidad apar-ente yen consecuencia con un riesgo de contacto alto entre moscas tse-tse y personas. Ademàs, estos resul-tados han demostrado que es posible evitar el aumento en la población de moscas tse-tse aplicando insecticidas en los animales en septiembre y principios de octubre, ya que el aumento en las poblaciones de moscas tse-tse se produce después de la época de lluvias.

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Copyright information

© Centre for Tropical Veterinary Medicine 1996

Authors and Affiliations

  • E. Katunguka-Rwakishaya
    • 1
  • E. K. Kabagambe
    • 2
  1. 1.Department of Veterinary MedicineFaculty of Veterinary Medicine, Makerere UniversityKampalaUganda
  2. 2.Department of Veterinary Public Health and Preventive MedicineFaculty of Veterinary Medicine, Makerere UniversityKampalaUganda

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