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Vertical Estimates of Survivorship of Larvae and Pupae of Anopheles Gambiae Giles Complex in Baringo District, Kenya

  • Ifeanyi Aniedu
  • Mutuku J. Munnga
  • Clifford M. Mutero
Research Article

Abstract

The stage-specific and age-specific survivorship of the immature stages of Anopheles gambiae Giles s.l. were studied in Barlngo 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 prédation was probably an important mortality factor.

Key Words

Mosquitoes Anopheles gambiae survivorship life tables 

Résumé

L’état spécifique et l’age spécifique 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 l’immergence de l’adulte était de 0.085, avec une mortalité s’élèvant à 91.5% pendant la saison des pluies. Cependant, la survie tombait à 0 (100% de mort) pendant la saison sèche.

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

Mots Clés

Moustiques Anopheles gambiae table de survie 

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • Ifeanyi Aniedu
    • 1
  • Mutuku J. Munnga
    • 1
  • Clifford M. Mutero
    • 1
  1. 1.The International Centre of Insect Physiology and Ecology (ICIPE)NairobiKenya

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