Avaliação da ocorrência de espécies de Anopheles e de outros culicídeos na hidrelétrica de Balbina, durante e após cinco anos do enchimento do reservatório

Abstract

An entomological survey was carried out in the area of ​​influence from the Balbina hydroelectric plant, located 146 km from Manaus, Amazonas, to assess possible effects on Anopheles populations and other Culicidae. The data obtained in 1987 and 1988, during the filling of the reservoir, were compared with those obtained in 1994. Five years after the formation of the lake, A. nuneztovari is the species more frequent in the area, also occurring A. darlingi and A. triannulatus. specimens of the first two species proved to be positive for plasmodium with immunoenzymatic tests. THE prevalence of positive mosquitoes was 1:35 for A. darlingi and only 1:548 for A. nuneztovari. The density of the other Culicidae was smaller in 1994 compared to that observed in 1987 and 1988, although the diversity was comparable to that recorded in other hydroelectric dams in the Amazon, built on white water rivers or clear. In the black waters of Balbina, an initial proliferation of macrophytes was followed by their reduction, possibly due to lack of nutrients in the water. The scarcity of Mansonia sp. in the area must be related to the decrease in the growth of macrophytes.