Identification of Human-Derived Volatile Chemicals that Interfere with Attraction of <Emphasis Type="Italic">Aedes aegypti</Emphasis> Mosquitoes |
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Authors: | James?G?Logan Michael?A?Birkett Suzanne?J?Clark Stephen?Powers Nicola?J?Seal Lester?J?Wadhams A?Jennifer?Mordue John?A?Pickett |
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Affiliation: | (1) Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK;(2) School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK |
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Abstract: | It is known that human individuals show different levels of attractiveness to mosquitoes. In this study, we investigated the
chemical basis for low attractiveness. We recorded behaviors of Aedes aegypti toward the hands of human volunteers and toward the volatile chemicals produced by their bodies. Some individuals, and their
corresponding volatiles, elicited low upwind flight, relative attraction, and probing activity. Analyzing the components by
gas chromatography coupled to electrophysiological recordings from the antennae of Aedes aegypti, enabled the location of 33 physiologically relevant compounds. The results indicated that higher levels of specific compounds
may be responsible for decreased “attractiveness.” In behavioral experiments, five of the compounds caused a significant reduction
in upwind flight of Aedes aegypti to attractive human hands. Thus, unattractiveness of individuals may result from a repellent, or attractant “masking,” mechanism. |
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Keywords: | Mosquito Differential attraction Semiochemical Attractant “ masking” effect |
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