Voorbeelden van tsetse fly

• Macrogeographic population structure of the tsetse fly population groups 3 and 4 to show more diversities than the others.

• The presence of tsetse fly and the semi-arid conditions of the region had historically precluded settlement by large populations.

• With the definitions given in the previous section, consider a population where the initial generation consists of one female tsetse fly.

• The area-wide sampling of tsetse fly, aided by satellite imagery, is the subject of two separate papers.

• The other estimates varied from two to 41 reproductive females and the lesser estimates are biased because tsetse fly generations greatly overlap.

• However, there were substantial differences in tsetse fly distribution and density between 1982 and 1996 (figs 2 and 3).

• In this paper a simple density-dependent reinvasion model is described and used to estimate tsetse fly populations on the basis of removal trapping experiments.

• They are transmitted between mammalian hosts by the bite of the tsetse fly.

• It sets out to describe the environmental changes observed over the past 15 years by using recent and historical satellite data and to assess their impact on tsetse fly populations.

• In these circumstances a stochastic model is preferable and the simple life history of the tsetse fly makes it amenable to modelling as a branching process.

• Where the geomorphological structure was not well suited to agricultural activity, riverine vegetation and tsetse fly populations were relatively unaffected, even with intense agricultural activity nearby.

• A study of the tsetse fly problem.

• It is not disputed that where the tsetse fly and game exist in a territory the keeping of domestic stock is not possible.

• With regard to the tsetse fly, here again we can open up fresh areas for grazing, both by aircraft spraying and by antrycide.

• I venture to suggest, in this connexion, that we should not be parsimonious in financing the research work in regard to the tsetse fly.