Ecological study on Aedes albopictus in Amami-Oshima

Abstract

1. Ecological study on the mosquito Aedes albopictus was made at a cemetery in Amami-Oshima from 1962 to 1963. 2. In summer the larvae and pupae of the mosquito can inhabit every conceivable domestic containers. 3. In summer the density of population of the larvae and pupae is 15.480 (per 100cc water) and the mean number of basins available for the mosquito is 1.112 (per 1m^2). The quantity of water containing in the basins averages 120cc. Thus, the number of adults of the mosquito emerging from the basins in the areas studied is, at least, 12, 000 per day. 4. Most larval sites in winter are flower vase made of bamboo, which stood in the areas not exposed from seasonal wind geographically (Fig.1). Winter density of population is as followas : Dec. (1.108) Jan. (0.228) Feb. (0.052) Mar. (0.008) 5. A discussion was made in relation to the reason why bamboo-stump is suitable for overwinter of the larvae.