Ma. titillans (n = 2,401) was 27.3% of all culicideans and 58.8% of Mansoniini. Its abundance was equally important among the capture sites. Ma. titillans females (98,4%) were more frequently seen than males in the traps.Interspecific competition with Coquillettidia and other Mansonia species did not play a major role in this study, since relative abundance of all species of this genus was consistently lower then Ma. titillans during the two and a half years studied.The weather was typical for the region during the studied period. The dry season take place between late fall and early spring, during 4 months, with some period variation. Rainy season began in September-October, and the heaviest rainfall period was from December to February (Figure 1).Three population peaks were recorded (Figure 2), all of them occurred in September [2002] or October [2003/2004], coinciding with the end of the dry season and beginning of the wet one at this region.First of all, the normality of the samples distribution was tested through Shapiro-Wilk Test and, as expected, normality of the sample was rejected (p < 0.001 , W = 0,67)The Kruskal-Wallis Test was performed to search for preference among the seasons. The null hypothesis, that the samples from different seasons have the same median, was accepted (H = 7.6779, p = 0.05316, df = 3), indicating that the seasonality of Ma. titillans was not directly determined by rainfall.Spearman's rank correlation coefficient showed little correlation between rainfall and Ma. titillans abundance (ρ = 0.173), and also was little when compared Other Mansoninii with rainfall (ρ = 0.008) and Ma. titilans and other Mansoninii abundance (ρ = 0.017).On Pairwise Wilcoxon Rank Sum Test, a significant difference was found between the Fall and Spring samples (0.049), while all other comparisons were non-significant. DiscussionAlthough statistical insignificance, Kruskal-Wallis' p-value was placed at the boundary of H 0 acceptance. This data is complemented by Pairwise Wilcoxon, which had significant difference. The combination of both tests can be interpreted by Ma. titillans having a relative stable abundance along the year, with one peaks of great abundance. So is clear that there are cyclical peaks of abundance, somehow related to the seasons of the year.The statistical analysis of the data did not reveal a connection between abundance and rainfall; this result can be explained by its ecology. Ma. titillans immature stages live on permanent breeding sites, which abundance and quality are not directly dependent of rainfall allowing Ma. titillans to be abundant throughout the year. An explanation on abundance peaks can be its breathing technique; using aerenchymas allow Mansoniini, and Ma. titillans specifically, to find they optimum environment, while others, lwhen also living on eutrophized waters, find hard times during dry season. De Kruijf (1975) also registered an abundance peak at similar season.
Like any enterprise that locally modify the water regime, the construction of dams supply modifies the ecology of Culicidae, which may lead to the emergence of epidemic outbreaks. In the present study was studied and compared as was the response of this community in the construction of dams and Paratirinda Bitiriba-Mirim, between 2002 and Both are part of the Alto Tiete System Producer, responsible for supplying most of metropolitan Sao Paulo. Sampling took place at Shannon trapping method, based on data collected were calculated index of ecological components, such as wealth, constancy, abundance, similarity, and others.The analysis of these components revealed that the faunas of the two dams had different stages, soon had the impact difererentes reactions. In Biritiba Mirim was present a wildlife forestry, which greatly diminished with the flood, while the fauna associated with macrophytes and temporary breeding sites grew, this led to decreased diversity in the period studied. In forestry Paraitinga fauna was absent, so the modifications were minor qualitative and quantitative. We have found the
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