Monitoring of Glossina austeni Newstead populations in the forested areas of Unguja island of Zanzibar has since November 1990 routinely been carried out with the sticky panel trap because commonly used tsetse traps (Biconical, Epsilon, F3) have proved to be unsuccessful in catching G. austeni. Initial studies on the catching ability of various types of sticky panels for G. austeni indicated that the monopanel was as efficient in catching flies as the 3-dimensional version and the smaller legpanel. No significant differences in catch rate and sex ratio were observed with monopanels in various colours and colour combinations. Legpanels coloured white on one panel side and blue on the other side caught significantly more flies compared with other colour combinations, but female flies were under-sampled (32%). The type of sticky material applied on the panel influenced significantly the catch rate and female ratio. During long-term trapping with baby blue and white monopanels, females were under-sampled (38-46%) except when polyisobutyleneLMW was used as sticky material. Analysis of the age composition of the sampled G. austeni females revealed that tenerals and nulliparous were well represented (11-24%). More than 20% of the trapped females were older flies, i.e. females with four or more ovulations, but this percentage dropped to 10% when Tanglefoot was used as sticky material.
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.Resume-Des etudes ont ete effectuees sur Glossina austeni capture avec des panneaux gluants pendant la saison seche et la saison des pluies dans la partie nord et centrale de la foret Jozani sur l'ile d'Unguja, Zanzibar. La densite de la population des mouches tsetse etait plus elevee d'une maniere significative dans la partie nord de la foret par rapport a la partie centrale. Les captures quotidiennes des males et femelles restaient stable dans le temps dans la partie nord de la foret, mais la densite de la population male diminuait d'une maniere significative dans la partie centrale de la foret a la fin de la saison seche. L'endroit du piege, aussi bien au nord que dans la partie centrale, influait beaucoup sur la grandeur de la capture et la proportion des femelles dans les echantillons. Seuls les echantillons dans la partie centrale de la foret penchaient vers une majorite d'un des sexes dependant des saisons. La composition d'age des mouches males ne dependait pas de l'endroit ou de la saison, mais dans la partie centrale, les saisons influaient sur la composition d'age des mouches femelles. Le taux de reproduction et d'avortement etaient comparables dans les deux endroits aussi bien pendant la saison des pluies que pendant la saison seche. La stabilite de la population des mouches en termes de densite et de composition est probablement le reflet de conditions optimales de l'environnement dans cet habitat de foret primaire.
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