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Evaluation of the influence of electric nets on the behaviour of oviposition site seeking Anopheles gambiae s.s
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Dugassa, Sisay, Lindh, Jenny M, Torr, Steve, Lindsay, Steven W and Fillinger, Ulrike (2014) Evaluation of the influence of electric nets on the behaviour of oviposition site seeking Anopheles gambiae s.s. Parasites & Vectors, Volume 7 (Number 1). Article number 272. doi:10.1186/1756-3305-7-272 ISSN 1756-3305.
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Official URL: http://dx.doi.org/10.1186/1756-3305-7-272
Abstract
Background:
Electric nets (e-nets) are used to analyse the flight behaviour of insects and have been used extensively to study the host-oriented flight of tsetse flies. Recently we adapted this tool to analyse the oviposition behaviour of gravid malaria vectors, Anopheles gambiae s.s., orienting towards aquatic habitats and traps by surrounding an artificial pond with e-nets and collecting electrocuted mosquitoes on sticky boards on the ground next to the nets. Here we study whether e-nets themselves affect the responses of gravid An. gambiae s.s..
Methods:
Dual-choice experiments were carried out in 80 m2 screened semi-field systems where 200 gravid An. gambiae s.s. were released each night for 12 nights per experiment. The numbers of mosquito landing on or approaching an oviposition site were studied by adding detergent to the water in an artificial pond or surrounding the pond with a square of e-nets. We also assessed whether the supporting framework of the nets or the sticky boards used to retain electrocuted mosquitoes influenced the catch.
Results:
Two similar detergent treated ponds presented in choice tests caught an equal proportion of the mosquitoes released, whereas a pond surrounded by e-nets caught a higher proportion than an open pond (odds ratio (OR) 1.7, 95% confidence interval (CI) 1.1 - 2.7; p < 0.017). The separate evaluation of the impact of the square of electric nets and the yellow boards on the approach of gravid females towards a pond suggests that the tower-like construction of the square of electric nets did not restrict the approach of females but the yellow sticky boards on the ground attract gravid females to a source of water (OR 2.7 95% CI 1.7 – 4.3; p < 0.001).
Conclusion:
The trapping efficiency of the electric nets is increased when large yellow sticky boards are placed on the ground next to the e-nets to collect electrocuted mosquitoes, possibly because of increased visual contrast to the aquatic habitat. It is therefore important when comparing two treatments that the same trapping device is used in both. The importance of contrast around artificial habitats might be exploited to improve collections of An. gambiae s.s. in gravid traps.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QH Natural history Q Science > QH Natural history > QH426 Genetics Q Science > QL Zoology |
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Tsetse-flies -- Eggs, Tsetse-flies -- Behavior, Tsetse-flies -- Reproduction, Aquatic habitats, Insect traps | ||||||||
Journal or Publication Title: | Parasites & Vectors | ||||||||
Publisher: | BioMed Central Ltd. | ||||||||
ISSN: | 1756-3305 | ||||||||
Official Date: | 19 June 2014 | ||||||||
Dates: |
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Volume: | Volume 7 | ||||||||
Number: | Number 1 | ||||||||
Article Number: | Article number 272 | ||||||||
DOI: | 10.1186/1756-3305-7-272 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 27 December 2015 | ||||||||
Date of first compliant Open Access: | 27 December 2015 | ||||||||
Funder: | African Regional Postgraduate Programme in Insect Science (ARPPIS), International Centre of Insect Physiology and Ecology (icipe), Deutscher Akademischer Austauschdienst (DAAD), National Institute of Health (NIH) | ||||||||
Grant number: | R01AI082537 (NIH) |
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