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Species composition, feeding and resting behaviour of the common anthropophilic anopheline mosquitoes in relation to malaria transmission in Gambella, south west Ethiopia

Published online by Cambridge University Press:  19 September 2011

Wondatir Nigatu ,
Beyene Petros ,
Mesfin Lulu ,
Nesibu Adugna  and
Robert Wirtz
Wondatir Nigatu
Affiliation:
National Research Institute of Health, P.O. Box 1242, Addis Ababa, Ethiopia
Beyene Petros
Affiliation:
Department of Biology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
Mesfin Lulu
Affiliation:
National Research Institute of Health, P.O. Box 1242, Addis Ababa, Ethiopia
Nesibu Adugna
Affiliation:
National Research Institute of Health, P.O. Box 1242, Addis Ababa, Ethiopia
Robert Wirtz
Affiliation:
Department of Entomology, Walter Reed Army Institute of Research, Washington D.C. 20307–5100
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Abstract

Species composition and behavioural patterns were determined for anopheline mosquito samples collected between October and September 1990, from Gambella region, south west Ethiopia. At least eight anopheline species, which differed in their habits, were found to be prevalent in the region. Findings of indoor-resting collection and hut density determinations showed the relative prevalence, in decreasing order of magnitude, to be Anopheles pharoensis, A. gambiae s.l., A. nili, A. coustani, and A. ziemanni. On the other hand, the relative frequency of occurrence based on outdoor human-bait capture was A. pharoensis, A. ziemmani, A. coustani, A. squamosus, A. paludis and A. funestus, in decreasing order of importance. The rate of human feeding of A. nili, A. gambiae s.l., A.pharoensis and A. coustani were 37.5, 33.0, 22.5 and 6.7%, respectively. Among the endophilic mosquitoes assayed, the overall infectivity rate was found to be 0.56%. Sporozoite rates of 0.77% for A. gambiae s.l. and 0.47% for A. pharoensis were determined.

Résumé

La composition de l'espèce et les types de comportement chez les echantillons de moustiques anophelines collectionnés entre octobre et septembre 1990 dans la région de Gambella, Sud-ouest de l'Ethiopie, ont été déterminés. Au moins huit espèces d'anopheline, qui différaient en habitudes étaient fréquentes dans la région. Les résultats des collections des moustiques a l'intérieur et de la détermination de leur densité dans les huttes ont montré que la fréquence relative, en décadence, était: Anopheles pharoensis, A. gambiae s.l., A. nili, A. coustani, et A. ziemanni. D'autre part, la fréquence relative basée sur des collections extérieure selon l'appât humain etait A. pharoensis, A. ziemanni, A. coustani, A. squamosus, A. paludis et A. funestus, en order de déclin. Le taux de A. nili, A. gambiae s. l., A. pharoensis et A. coustani se nourrissant sur l'humain etait, respectivement, 37.5%, 33.0%, 22.5% et 6.7%.

Parmiles moustiquesqui préféraient l'intérieure, létaux d'infection était, en général de 036%. Des taux de sporozoites de 0.77% pour A. gambiae et de 0.47% pour A. pharoensis ont été determinés.

Keywords

Anophelesbehaviourresettlement and agricultureAnophelescomportementreinstallation et agriculture
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 3 , June 1994 , pp. 371 - 377
Copyright
Copyright © ICIPE 1994

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