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The Vertical Distribution of some West African Mosquitoes (Diptera,Culicidae) Over Open Farmland in a Freshwater Area of the Gambia

Gillies, M.T. and Wilkes, T.J. (1976) The Vertical Distribution of some West African Mosquitoes (Diptera,Culicidae) Over Open Farmland in a Freshwater Area of the Gambia. Bulletin of Entomological Research, 66. pp. 1-15. ISSN 0007-4853

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Abstract

Mosquitoes flying at low levels over open farmland were sampled by means of electrical suction traps. These were set up at nine levels from ground level up to 6 m. From the vertical profiles obtained it was possible to recognise three patterns of behaviour: (1) a low-flying group with relatively very high densities below 1 m, comprising Mansonia (Mansonioides) spp., Aedes spp. and some species of Anopheles; (2) an intermediate group with densities rather evenly distributed at the lower levels but declining above 2-4 m, comprising A. funestus Giles, A. gambiae Giles and Culex neavei Theo.; (3) a high-flying group with catches at 6 m greater, or much greater, than at 1 m, composed of C. antennatus (Becfcer),C. thalassius Theo. and C. poicilipes (Theo.). For all species, catches after 23.00 h showed an increase in the proportion of mosquitoes taken in traps at the lower levels, this being most marked at ground level and 0-5 m. No influence of either moonlight or wind speed could be detected to account for this. Biting catches on human baits showed a generally similar pattern to suction-trap catches, although differences between baits at 1-m intervals at the higher levels were less than with unbaited traps.

Item Type: Article
Keywords: Mosquitoes, Anopheles, Anopheles Melas, Anopheles Gambiae, Gambia, West Africa
Subjects: Malaria > Vector control
Divisions: Other
Depositing User: Mr Joseph Madata
Date Deposited: 08 Apr 2013 06:49
Last Modified: 08 Apr 2013 06:49
URI: http://ihi.eprints.org/id/eprint/1297

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