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Circadian flight activity of Simulium spp. (Diptera: Simuliidae) sampled with a vehicle-mounted net in central Nigeria

Published online by Cambridge University Press:  10 July 2009

D. M. Roberts  and
R. J. Irving-Bell
D. M. Roberts
Affiliation:
Department of Zoology, University of Jos, P.M.B. 2084, Jos, Nigeria
R. J. Irving-Bell
Affiliation:
Department of Zoology, University of Jos, P.M.B. 2084, Jos, Nigeria
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Abstract

A vehicle-mounted net was used to study the circadian flight activity of several species of Simulium in a northern Guinea savanna area in Nigeria during the dry season. The sampling method yielded large numbers of both sexes of Simulium squamosum (Endertein) of the, S. damnosum Theobald complex, S. hargreavesi Gibbins, S. vorax Pomeroy, S. adersi Pomeroy, S. hirsutum Pomeroy and other species. The main peak of activity of all species recorded occurred just after sunset and there was a smaller peak just before sunrise. Flies continued to be caught at a low level 2·5 h after sunset when sampling ceased. Differences in the activity patterns of S. squamosum males and females and of the other species were analysed. Of the S. squamosum females caught, 12% were blood-fed; these and gravid females were mainly active in the evening, while the blood-thirsty flies had a high level of activity throughout the day. Differences between species in the relative activity of blood-thirsty and gravid flies, and nulliparous and parous flies are noted.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 75 , Issue 1 , March 1985 , pp. 23 - 34
Copyright
Copyright © Cambridge University Press 1985

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