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• W2138407659 abstract "In this study, a very extensive law protected mangrove area in the Eastern part of the Guanabara Bay was screened for petroleum hydrocarbons (PAHs) and bacterial activity. The aim was to understand the processes that control oil contamination in the mangrove sediments and if there is a relationship between this contamination and bacterial activity. Surface sediment samples were collected from 23 stations within the mangrove shoreline. The parameters pH, Eh, salinity and temperature were measured in situ. The sediments were immediately analyzed for bacterial activity, including: 1) electron transport system activity (ETSA); 2) activity of the esterase enzyme (EST); and 3) bacterial biomass. Analyses of the total PAHs contents were performed by UV-visible spectrofluorescence, total organic carbon was analyzed by titration and total phosphorus was analyzed by photocolorimetry, after wet oxidation. The results show that, in spite of the significant amounts of hydrocarbons loaded into the bay, Guapimirim mangrove still presents low concentrations. The presence of elevated concentrations of organic matter and nutrients provides sufficient energy for the development of an important bacterial biomass. The quality of the organic matter is determining the activity of the bacteria as indicated by ETSA and EST. When the organic matter is easily metabolized there would be predominance of esterase enzyme. The ETSA seems to be active most of the time, because bacteria is using readly available organic matter an PAHs. The results indicated that although there is a significant supply of easily metabolized organic matter, bacteria obtain part of its energy from the refractive organic matter. It is suggested that during the degradation of refractive organic matter, some petroleum hydrocarbons are also degraded. RESUMO Neste estudo uma extensa Area de Protecao Ambiental (APA) de manguezal, localizada na porcao Leste da Baia de Guanabara, foi mapeada para hidrocarbonetos poliaromaticos de petroleo (HPAs) e para a atividade bacteriana. O objetivo foi compreender os processos que controlam a contaminacao por oleo em sedimentos de manguezal e se ha relacao entre esta contaminacao e a atividade bacteriana. Amostras de superficie dos sedimentos foram coletadas em 23 estacoes, na linha de costa que separa o manguezal da baia. Os parâmetros pH, Eh, salinidade e temperatura foram" @default.
• W2138407659 created "2016-06-24" @default.
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• W2138407659 date "2006-01-01" @default.
• W2138407659 modified "2023-10-18" @default.
• W2138407659 title "HYDROCARBONS AND BACTERIAL ACTIVITY IN MANGROVE SEDIMENTS FROM GUANABARA BAY, BRAZIL" @default.
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• W2138407659 doi "https://doi.org/10.21715/gb.v20i1.232" @default.
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