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Close encounters: contributions of carbon dioxide and human skin odour to finding and landing on a host inAedes aegypti
Physiological Entomology ( IF 1.5 ) Pub Date : 2014-01-07 , DOI: 10.1111/phen.12048
Emerson S Lacey 1 , Anandasankar Ray 1 , Ring T Cardé 1
Affiliation  

In a wind‐tunnel study, the upwind flight and source location of female Aedes aegypti to plumes of carbon dioxide (CO2) gas and odour from human feet is tested. Both odour sources are presented singly and in combination. Flight upwind along the plumes is evident for both CO2 and odour from human feet when the odours are presented alone. Similarly, both odour sources are located by more than 70% of mosquitoes in less than 3 min. When both CO2 and odour from human feet are presented simultaneously in two different choice tests (with plumes superimposed or with plumes separated), there is no evidence that females orientate along the plume of CO2 and only a few mosquitoes locate its source. Rather, the foot odour plume is navigated and the source of foot odour is located by over 80% of female Ae. aegypti. When a female is presented a plume of CO2 within a broad plume of human foot odour of relatively low concentration, the source of CO2 is not located; instead, flight is upwind in the diffuse plume of foot odour. Although upwind flight by Ae. aegypti at long range is presumably induced by CO2 and the threshold of response to skin odours is lowered, our findings suggest that, once females have arrived near a prospective human host, upwind orientation and landing are largely governed by the suite of human odours, whereas orientation is no longer influenced by CO2.

中文翻译:

近距离接触:二氧化碳和人体皮肤气味对在埃及伊蚊中寻找和着陆宿主的贡献

在一项风洞研究中,测试了雌性埃及伊蚊的逆风飞行和来源位置,以及来自人脚的二氧化碳 (CO2) 气体和气味的羽流。两种气味来源单独或组合呈现。当气味单独出现时,CO2 和来自人脚的气味明显沿着羽流逆风飞行。同样,在不到 3 分钟的时间内,超过 70% 的蚊子都可以找到这两种气味来源。当 CO2 和来自人脚的气味同时出现在两个不同的选择测试中(羽状物叠加或羽状物分开)时,没有证据表明雌性蚊子沿着 CO2 羽状物定向,只有少数蚊子找到了它的来源。相反,脚臭羽流被导航并且脚臭源位于超过 80% 的女性 Ae。埃及人。当女性在相对较低浓度的人体脚臭的广泛羽状物中呈现二氧化碳羽状物时,二氧化碳的来源未定位;相反,在弥漫的脚臭味中,飞行是逆风的。虽然由 Ae 逆风飞行。远距离的埃及伊蚊大概是由二氧化碳引起的,并且对皮肤气味的反应阈值降低了,我们的研究结果表明,一旦雌性接近预期的人类宿主,逆风方向和着陆在很大程度上受人类气味的影响,而方向不再受 CO2 影响。
更新日期:2014-01-07
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