Ecological studies on the breeding of Aedes aegypti and other mosquitos in shells of the giant African snail Achatina fulica

M. Trpis

Research output: Contribution to journalArticlepeer-review

Abstract

The breeding of larvae of Aedes aegypti, Aedes simpsoni, and Eretmapodites quinquevittatus in empty shells of Achatina fulica was studied in the coastal zone of Dar es Salaam, Tanzania. The average density of shells was estimated to be 228 per ha. From 11 to 35% were positive for mosquito larvae. A. aegypti were found in 82-84% of positive shells; A simpsoni in 8-13%. On Msasani peninsula, during the 3 mth rainy season, April to June 1970, the larval density of A. aegypti in shells was estimated at 1100 per ha, that of A. simpsoni and E. quinquevittatus being estimated at 60 and 280 larvae per ha, respectively. Empty shells of A. fulica may contain up to 250 ml of water (average: 56.5 ml). The number of larvae per shell varies from 1 to 35 (average: 8.4) and it was estimated that, depending on the availability of food, and other factors, approximately 10 ml of water are required per larva. Viable eggs of A. aegypti were still to be found in 4% of the shells at the end of the dry season.

Original languageEnglish (US)
Pages (from-to)447-453
Number of pages7
JournalBulletin of the World Health Organization
Volume48
Issue number4
StatePublished - Dec 1 1973

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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