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The effect of a reduction in expired carbon dioxide on the attractiveness of human subjects to mosquitoes

Published online by Cambridge University Press:  10 July 2009

W. F. Snow
W. F. Snow
Affiliation:
School of Biological Sciences, University of SussexBrighton, Sussex, England
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Extract

The attractiveness, to mosquitoes, of human subjects breathing normally and wearing a breathing apparatus which removed 95·5% of expired carbon dioxide were compared in the field. Significantly fewer mosquitoes approached the subject with a reduced carbon-dioxide output. Species differences were apparent in the degree of reduction of mosquitoes at the bait, as measured by the ratio of numbers attracted to subjects without and with the breathing apparatus. From the results of trials in the Gambia, West Africa, this ratio gave values of 0·67 for Mansonioides spp., 0·46 for Anopheles gambiae Giles/A. melas Theo. and 0·19 for Culex thalassius Theo., while complementary work in southern England gave a value of 0·34 for Aedes cantans (Mg.)/Ae. annulipes (Mg.). A reduced carbon-dioxide output had no effect on the proportion of mosquitoes attempting to feed once within close range of the host. These findings confirm that carbon dioxide is a long- or medium-range attractant.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 60 , Issue 1 , August 1970 , pp. 43 - 48
Copyright
Copyright © Cambridge University Press 1970

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