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The range of attraction of animal baits and carbon dioxide for mosquitoes. Studies in a freshwater area of West Africa

Published online by Cambridge University Press:  10 July 2009

M. T. Gillies  and
T. J. Wilkes
M. T. Gillies
Affiliation:
School of Biological Sciences, University of Sussex, Brighton, BNI 9BQ, U.K.
T. J. Wilkes
Affiliation:
School of Biological Sciences, University of Sussex, Brighton, BNI 9BQ, U.K.
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Extract

In an inland area of the Gambia the density of flying mosquitoes at successive distances from a pair of bait-calves or an equivalent source of carbon dioxide was measured with ramp-traps to determine the maximum range at which orientation towards the bait was initiated. Thirty-six traps were operated at intervals of 7·5 m up to a distance of 60 m from the bait, on 66 nights. Anopheles ziemanni Grünb., Mansonia uniformis (Theo.) and Aedes spp. were responding to the presence of the baitcalves from a distance of 22·5–30 m; with carbon dioxide as bait the same species showed a clear response at 15 m but, with the doubtful exception of M. uniformis, not at 22·5–30 m. M. africana (Theo.) responded to both calf and carbon dioxide baits at 15 m but not at more distant ranges. Culex thalassius Theo. and C. univittatus Theo. showed a response at 7·5 m but not at any greater distance. C. decens group showed no response to either bait even in the nearest traps (7·5 m). The parous rate in Mansonia spp. varied with distance from the bait. Similar variation in the proportion of females infested with mites was not detected.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 61 , Issue 3 , February 1972 , pp. 389 - 404
Copyright
Copyright © Cambridge University Press 1972

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