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Using a near-infrared spectrometer to estimate the age of Anopheles mosquitoes exposed to pyrethroids

Author:
Sikulu, Maggy T., Majambere, Silas, Khatib, Bakar O., Ali, Abdullah S., Hugo, Leon E., Dowell, Floyd E.
Source:
Plos One 2014 v.9 no.3 pp. e90657
ISSN:
1932-6203
Subject:
Anopheles, adults, age structure, environmental exposure, environmental factors, insect larvae, insecticides, near-infrared spectroscopy, pyrethrins, traps
Abstract:
We report on the accuracy of using near-infrared spectroscopy (NIRS) to predict the age of Anopheles mosquitoes reared from wild larvae and a mixed age-wild adult population collected from pit traps after exposure to pyrethroids. The mosquitoes reared from wild larvae were estimated as ,7 or $7 d old with an overall accuracy of 79%. The age categories of Anopheles mosquitoes that were not exposed to the insecticide papers were predicted with 8% accuracy whereas the age categories of resistant, susceptible and mosquitoes exposed to control papers were predicted with 82%, 78% and 79% accuracy, respectively. The ages of 85% of the wild-collected mixed-age Anopheles were predicted by NIRS as #8 d for both susceptible and resistant groups. The age structure of wild-collected mosquitoes was not significantly different for the pyrethroid-susceptible and pyrethroid-resistant mosquitoes (P = 0.210). Based on these findings, NIRS chronological age estimation technique for Anopheles mosquitoes may be independent of insecticide exposure and the environmental conditions to which the mosquitoes are exposed.
Agid:
58622
Handle:
10113/58622