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Background    Anopheles  mosquitoes are the only vectors of human malaria.  Anopheles  species use standing water as breeding sites. Human activities, like the creation of an artificial lake during the implementation of hydroelectric power plants, lead to changes in environmental characteristics and, therefore, may changes the species richness and composition of  Anopheles  mosquitoes. The aim of the present study was to verify whether or not there is an association between the artificial flooding resulting from the construction of the Jirau hydroelectric power plant, and the richness and composition of anophelines.    Methods  Mosquitoes samples were obtained monthly from the Jirau hydroelectric power plant area located at Porto Velho, Rondônia State, using Human Landing Catch (06:00–10:00 PM). Mosquitoes collected were transported to Laboratório de Entomologia Médica FIOCRUZ-RO where they were identified until species using dichotomous key.    Results  A total of 6347 anophelines belonging to eight different species were collected. The anophelines species richness was significantly lower during the first flooding stage. Differences in anophelines species composition were found when comparing the first flooding stage with the other stages. Furthermore, the mean number of  Anopheles darlingi , the main vector of malaria in the region, increases during the first and the third flooding stages.    Conclusions  The continual monitoring of these vectors during the late operational phase may be useful in order to understand how anophelines will behave in this area.    Electronic supplementary material  The online version of this article (doi:10.1186/s12936-017-1738-7) contains supplementary material, which is available to authorized users.

malaria journal

Change in Anopheles richness and composition in response to artificial flooding during the creation of the Jirau hydroelectric dam in Porto Velho, Brazil