Navegando por Palavras-chave "Limnological Variables"

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    Diversidade microbiana envolvida nos fluxos de gases de efeito estufa em reservatórios urbanos tropicais
    (Universidade Federal de São Paulo (UNIFESP), 2020-08-19) Pierangeli, Gabrielle Maria Fonseca [UNIFESP]; Gregoracci, Gustavo Bueno [UNIFESP]; Universidade Federal de São Paulo
    Methane (CH4) and carbon dioxide (CO2) are greenhouse gases (GHG) responsible for global climate changes and can be produced through organic matter decomposition. Several studies show that freshwater reservoirs can emit both CH4 e CO2, being the microbial metabolic activities one of the main responsible for production and consumption of these gases in these environments. Habitat characteristics influence on communities, interactions between microorganisms and, consequently, in the dynamics gas flows. The aim of this study was to analyze the communities of archaea and bacteria in sediments of three tropical urban reservoirs, in Metropolitan Region of São Paulo, Brazil, to evaluate the microbial potential to produce and/or consume CH4 and CO2 in these environments. Along the seasons, between March 2018 and January 2019, were sampled the sediment, the bottom water and the gases in air-water interface, in 4 sites in Billings reservoir, 3 sites in Rio Grande and 4 sites in Guarapiranga. The DNA from sediment was extracted, amplified to 16S gene, sequenced and processed with bioinfomatics. The statistical Kruskal-Wallis and Scott- Knott tests were performed to evaluate the influence of several limnological variables from sediment and bottom water on microbiota and CO2 and CH4 flows in water-air interface. The micro-organisms were then correlated with gas flows and limnological variables. The microbiota presented slight tendency to spatial variation, which was not show determined only by limnological variables analyzed. In reservoirs, there are potential to CH4 oxidation coupled to sulfato, nitrate, nitrite or Fe(III) reduction, which can reduce the flow of this gas to atmosphere and toxicity of these compounds. The greater methanogens abundance did not promote the greater CH4 flows, but the fermenter community was determinant for both CH4 and CO2 flows. The microorganisms correlated with the GHG flows also correlated with limnological variables that characterize anthropogenic pollution by domestic sewage discharge, showing that sanitation approaches can help to mitigate gas flows through reservoirs.