BackgroundAnopheles darlingi is the major vector of malaria in South America, and its behavior and distribution has epidemiological importance to biomedical research. In Brazil, An. darlingi is found in the northern area of the Amazon basin, where 99.5% of the disease is reported.MethodsThe study area, known as Ramal do Granada, is a rural settlement inside the Amazon basin in the state of Acre. Population variations and density have been analysed by species behaviour, and molecular analysis has been measured by ND4 mitochondrial gene sequencing.ResultsThe results show higher density in collections near a recent settlement, suggesting that a high level of colonization decreases the vector presence. The biting activity showed higher activity at twilight and major numbers of mosquitos in the remaining hours of the night in months of high density. From a sample of 110 individual mosquitoes, 18 different haplotypes were presented with a diversity index of 0.895, which is higher than that found in other Anopheles studies.ConclusionsAn. darlingi depends on forested regions for their larval and adult survival. In months with higher population density, the presence of mosquitoes persisted in the second part of the night, increasing the vector capacity of the species. Despite the intra-population variation in the transition to rainy season, the seasonal distribution of haplotypes shows no change in the structure population of An. darlingi.
In Rondônia State, Brazil, two IntroduçãoAs transformações ambientais realizadas pelo homem visando o desenvolvimento e o crescimento da economia são necessárias dentro do contexto social e devem ser realizadas seguindo-se padrões legais, visando causar os menores impactos possíveis. Ambientes aquáticos são amplamente utilizados pelo homem com as mais diferentes finalidades, entre elas o abastecimento de água, geração de energia, irrigação, navegação, piscicultura ou mesmo paisagismo 1 .A construção de barragens para implantação de Usinas Hidrelétricas (UHE) é uma necessidade para o desenvolvimento de uma micro e/ou macro região, pois a oferta de energia elétrica atrai novos investimentos e, com isso, haverá o crescimento da economia local. A Região Norte do Brasil é rica em recursos hídricos. Segundo a Agência Nacional de Energia Elétrica (ANEEL; http://www.aneel.gov.br, acessado em 07/Set/2005), o potencial hidráulico, ou hidroenergético, do país é de 260GW, dos quais apenas 25% estão sendo utilizados para a produção de energia pelas UHE de médio e grande porte e pelas Pequenas Centrais Hidrelétricas (PCH). A Região Norte tem o maior potencial para geração hidráulica com 114GW, ou 44%.Para o Estado de Rondônia, estão planejadas a construção de seis UHE (Jirau, Santo Antônio, Madeira Binacional, Monte Cristo, Ávila e Ji-Paraná) e duas PCH (Cachimbo e Alta Floresta), que
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