Evidence of an ‘invitation’ effect in feeding sylvatic Stegomyia albopicta from Cambodia

Particle and Fibre Toxicology

Olivier JT Briët¹  Louise Kelly-Hope²  Elsa VE Tomás⁴  J Derek Charlwood³ 

[1] University of Basel, PO Box, CH-4003, Basel, Switzerland;Centre for Neglected Tropical Diseases, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK;Vector Group, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK;MOZDAN (Mozambican-Danish Rural Malaria Project), PO Box 8, Morrumbene, Inhambane Province, Mozambique

关键词: Cambodia;    Landing;    Stegomyia albopicta;    Body site preference;    Invitation effect;   

Others  :  1183555
DOI  :  10.1186/1756-3305-7-324

 received in 2014-04-03, accepted in 2014-06-29,  发布年份 2014

【 摘 要 】

Background

Orientation of haematophagous insects towards a potential host is largely mediated by kairomones that, in some groups or species may include chemicals produced during feeding by the insects themselves, the so called ‘invitation’ effect.

Methods

The ‘invitation’ effect in blood-feeding diurnally active Stegomyia albopicta was investigated over 33 days in secondary forest in Mondolkiri Province, Cambodia. Two human volunteers sitting inside a shelter collected mosquitoes and noted where and when they landed. A 10% emanator of a synthetic pyrethroid with high vapour action was in use on alternate days.

Results

Overall, 2726 mosquitoes were collected, 1654 of which had the landing site recorded. The heads of the volunteers were the locations with the highest density of landings per surface area whilst the knees and elbows accounted for most of the landings received on the arms and legs. Landings recorded within three minutes of each other on a collector were about 2.5 times more likely to be on the same body part than on a random body part, weighted for landing site preference. This preference did not vary with collector or pyrethroid.

Conclusions

The ‘invitation’ effect may be due to a semio-chemical produced early in the feeding process. Incorporation of such a chemical into traps designed to control this important vector of dengue and chikungunya viruses might potentially improve their attractiveness.

【 授权许可】

   
2014 Charlwood et al.; licensee BioMed Central Ltd.

【 图 表 】

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