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Notes on the Ecology of a Natural Glossina austeni (Diptera: Glossinidae) Population in the Jozani Forest, Unguja Island of Zanzibar

Published online by Cambridge University Press:  19 September 2011

Marc J. B. Vreysen  and
Issa S. Khamis
Marc J. B. Vreysen*
Affiliation:
International Atomic Energy Agency, P.O. Box 100, A-1400 Vienna, Austria
Issa S. Khamis
Affiliation:
Commission of Agriculture, Livestock and Natural Resources, P.O. Box 159, Zanzibar, United Republic of Tanzania
*
Corresponding author: MV. IAEA Project RAF/5/040, P.O. Box 19917, Addis Ababa, Ethiopia. E-mail: [email protected]
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Abstract

Studies were made of Glossina austeni captured with sticky panels during the dry and wet season in the northern and central part of the Jozani forest on the island of Unguja, Zanzibar. The density of the fly population was significantly higher in the northern part of the forest than in the central. Female and male daily catches remained stable in time in the northern part of the forest but the density of the male fly population declined significantly in the central part of the forest at the end of the dry season. The magnitude of the catch and the sex ratio of the samples was highly affected by the trap site in both locations. Only samples in the central part of the forest were biased towards one of the sexes depending on the seasons. The age composition of the male flies was independent of locality and season but the one of female flies was influenced by the seasons in the central part of the forest. The breeding and abortion rate of flies were similar in the two locations both during the wet and dry seasons. The stability of the fly population in terms of density and composition is probably a reflection of the optimal environmental conditions in this primary forest habitat.

Résumé

Des études ont été effectuées sur Glossina austeni capturé avec des panneaux gluants pendant la saison sèche et la saison des pluies dans la partie nord et centrale de la forêt Jozani sur l'île d'unguja, Zanzibar. La densité de la population des mouches tsétsé était plus élevée d'une manière significative dans la partie nord de la forêt par rapport à la partie centrale. Les captures quotidiennes des mâles et femelles restaient stable dans le temps dans la partie nord de la forêt, mais la densité de la population mâle diminuait d'une manière significative dans la partie centrale de la forêt à la fin de la saison sèche. L'endroit du piège, aussi bien au nord que dans la partie centrale, influait beaucoup sur la grandeur de la capture et la proportion des femelles dans les échantillons. Seuls les échantillons dans la partie centrale de la forêt penchaient vers une majorité d'un des sexes dépendant des saisons. La composition d'âge des mouches mâles ne dépendait pas de l'endroit ou de la saison, mais dans la partie centrale, les saisons influaient sur la composition d'âge des mouches femelles. Le taux de reproduction et d'avortement étaient comparables dans les deux endroits aussi bien pendant la saison des pluies que pendant la saison sèche. La stabilité de la population des mouches en termes de densité et de composition est probablement le reflet de conditions optimales de l'environnement dans cet habitat de forêt primaire.

Keywords

Glossina austenisticky panelecologysample size and compositionsite effectsGlossina austenipanneau gluantécologiegrandeur et composition d'échantillonseffet de l'endroit du piège
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 19 , Issue 2-3 , September 1999 , pp. 99 - 108
Copyright
Copyright © ICIPE 1999

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