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Vertical estimates of survivor of larvae and pupae of Anopheles gambiae Giles complex in Baringo District Kenya


Vertical estimates of survivor of larvae and pupae of Anopheles gambiae Giles complex in Baringo District Kenya



Insect Science and its Application 14(1): 39-48



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 probably an important mortality factor.

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