Influence of Sugar Availability and Indoor Microclimate on Survival of Anopheles gambiae (Diptera

Culicidae) under Semifield Conditions in Western Kenya

Bernard A. Okech, Louis C. Gouagna, Gerard F. Killeen, Bart G J Knols, Ephantus W. Kabiru, John C Beier, Guiyan Yan, John I. Githure

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The influence of indoor microclimate on survival of female Anopheles gambiae sensu stricto Giles (Diptera: culicidae) mosquitoes fed on different nutrition sources was evaluated in a semifield experimental hut exposed to ambient climate in western Kenya. Cages of mosquitoes (n ≈ 50 per cage) were placed in nine positions within the hut combining three different sides and three different heights. At each height and side, mosquitoes were offered either human blood (once every 2d), glucose (6% wt:vol) or a combination of the two diets over three experiments so that each cage position received one diet source. The effect of diet on survival was significant with mean survival times of 14 d for mosquitoes fed blood alone, 29 d for sugar alone and 33 d for blood plus sugar. Sugar availability decreased the odds of mortality ≈85% compared with the blood group. Micro heterogeneities of temperature but not relative humidity also influenced survival although to a much lesser extent. The side but not height within the hut at which mosquitoes were placed, influenced survival but could not be explained by either temperature or relative humidity differences. The potential influence of seemingly minor heterogeneities of indoor microclimate upon vector longevity and vectorial capacity may merit further investigation. Also, the availability of sugar was shown to be a potentially crucial determinant of vectorial capacity. Compared with blood alone, the availability of sugar served to increase survival potential of vectors beyond ages at which they are old enough to transmit malaria.

Original languageEnglish
Pages (from-to)657-663
Number of pages7
JournalJournal of Medical Entomology
Volume40
Issue number5
StatePublished - Sep 1 2003
Externally publishedYes

Fingerprint

Microclimate
Anopheles gambiae
Kenya
Culicidae
microclimate
Diptera
sugars
vectorial capacity
cages
Survival
blood
Diet
Humidity
relative humidity
diet
vector competence
Temperature
blood groups
Blood Group Antigens
Climate

Keywords

  • Anopheles survival
  • Blood
  • Indoor climate
  • Sugar
  • Vectorial capacity

ASJC Scopus subject areas

  • Insect Science
  • veterinary(all)

Cite this

Influence of Sugar Availability and Indoor Microclimate on Survival of Anopheles gambiae (Diptera : Culicidae) under Semifield Conditions in Western Kenya. / Okech, Bernard A.; Gouagna, Louis C.; Killeen, Gerard F.; Knols, Bart G J; Kabiru, Ephantus W.; Beier, John C; Yan, Guiyan; Githure, John I.

In: Journal of Medical Entomology, Vol. 40, No. 5, 01.09.2003, p. 657-663.

Research output: Contribution to journalArticle

Okech, Bernard A. ; Gouagna, Louis C. ; Killeen, Gerard F. ; Knols, Bart G J ; Kabiru, Ephantus W. ; Beier, John C ; Yan, Guiyan ; Githure, John I. / Influence of Sugar Availability and Indoor Microclimate on Survival of Anopheles gambiae (Diptera : Culicidae) under Semifield Conditions in Western Kenya. In: Journal of Medical Entomology. 2003 ; Vol. 40, No. 5. pp. 657-663.
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