ECOLOGICAL FEATURES OF AEDES-AEGYPTI IN A FRICA AND ASIA

Aedes aegypti is originated from Africa and expanded around the tropic al World with a pantropical distribution in 1930. Because of mosquito control, this extension decreased, brit is still very important and th reatening because of disease transmission. Eggs of Ae. aegypti cart su rvive unfavorable conditions. Larvae and pupae of Ae. aegypti breed in to natural or artificial containers, the lash being the most important . Artificial breeding-sires are mostly water storage containers and di scarded containers. The water storage containers, cabled <<canaris>> i n West Africa, can assume different shape according to the human popul ations in which they al-e Sound. In Asia, water is stored everywhere, including in large towns. The adult females of Ae. aegypti ave mostly diurnal and indoor feeders. Adult densities are variable and can I-eac h huge numbers, Active dispersion of females is weak, one female usual ly visit one or two houses in its life. Ar the opposite, passive dispe rsion is extreme. The mean life duration of a female is about 2 to 3 w eeks, thus when infected with dengue viruses, because of the duration of the extrinsic cycle of the viruses, a female has a low probability to survive enough to transmit the disease. Nevertheless, the system wo rks quite well. Although Ae. aegypti is a a domestic,, mosquito, its e cology remains largely misunderstood.