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Vertical estimates of survivorship of larvae and pupae of Anopheles gambbiae Giles complex in Baringo District, Kenya

Published online by Cambridge University Press:  19 September 2011

Ifeanyi Aniedu
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
Mutuku J. Mutinga
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya
Clifford M. Mutero
Affiliation:
The International Centre of Insect Physiology and Ecology (ICIPE), P. O. Box 30772, Nairobi, Kenya

Abstract

The stage-specific and age-specific survivorship of the immature stages of Anopheles gambiae Giles s. l. were studied in Baringo District Kenya, using vertical life-table methods.

Survivorship from first instar to adult emergence was 0.085, giving a mortality of 91.5% during the rainy season. However, survivorship dropped to zero (100% mortality) in the dry season.

Mortality was most severe in the first and second instars in all cases. Mean life expectancy increased significantly for larvae that survived beyond the first 3 days of life. Suspected predators of mosquito pre-imagines in the breeding sites were collected and counted. From their large numbers and diversity it was inferred that predation was probablyan important mortality factor.

Résumé

L'état spécifique et l'age spéciflque des stades immature d'Anopheles gambiae Giles s. l. ont été étudiés dans le District de Baringo au Kenya, en utilisant des méthodes verticales de table de survie.

La survie de 1er stade jusqu'à I'immergence de l'adulteétait de 0.085, avec une mortalité s'élévant à 91.5% pendant la saison des pluies. Cependant, la survie tombait à 0 (100% de mort) pendant la saison seche.

Dans tous les cas, la mortallté était élévée pendant le 1er et le 2e stade de developpement. La moyenne de survie à augmenté d'une façon significative pour les larves qui ont survecu au déla de leur trois premiers jours de vie. Les prédateurs suspectcs des moustiques immatures dans les lieux de ponte étaient collectés et comptés. A partir de leur nombre éléve et leur diversité, il était conclu que la prédation était probablement un facteur important de mortalité.

Type
Research Articles
Copyright
Copyright © ICIPE 1993

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