The distribution of Culex (Culex) quinquefasciatus Say (1823) along of the margins of the Pinheiros river and the main factors that lead to the proliferation of the species were studied doing weekly collections of adult mosquitoes, in the period of one year, in three equidistant points in the margins of the river. For the collections of mosquitoes battery vacuum cleaner was used, for a period of five minutes. The mosquitoes were identified, differentiated according to the sex and counted. For verification of the physiological state, the females were differentiated in empty, with blood or eggs. A total of 35.684 mosquitoes were captured, all of them were identified as Cx. quinquefasciatus, being 39.4% females and 60.6% males. The frequencies took different proportions between the points of collections and in a temporary series. The damaged environment of the Pinheiros river represents an excellent breeding site of Cx. quinquefasciatus, confirmed by the occurrence of picks accentuated in the frequency of mosquitoes, with development in an explosive way and accumulation between the generations, after the rains and in summer times.
Culicidae; mosquitoes; population dynamic
