STUDIES ON MOSQUITOS (DIPTERA, CULICIDAE) AND ANTHROPIC ENVIRONMENT .2. IMMATURE STAGES RESEARCH AT A RICE IRRIGATION SYSTEM LOCATION IN SOUTH-EASTERN BRAZIL

A relation between a rice irrigation system and mosquito breeding was established in a study undertaken at the Ribeira Valley Experimental S tation, from January through December 1992. Flooding favoured Anophele s (Nyssorhynchus) and Culex (Melanoconion) species, while empty paddie s condition were propitious to Aedes scapularis and Culex (Culex) spec ies. Compared with a more primitive area of the same region, several s pecies showed high a degree of adaptation to the anthropic environment . Among them, Anopheles albitarsis, a potential malaria vector that br eeds in the irrigation system, has shown immature stage production thi rteen times higher than at the natural breeding sites. In addition, Ae . scapularis, An. oswaldoi, Cx. bastagarius, and Cx. chidesteri presen ted high levels of synanthropy.