RESUMO
The aim of this work was to quantify the biopolymers associated to esterase enzymes and identify bacterial respiratory activity in four cores collected in Suruí Mangrove, Guanabara Bay - RJ. Biopolymer concentration was 1000 times lower than previously reported in the literature, indicating the need for creating and establishing eutrophication indicative rates and records compatible with tropical coastal systems. The biochemical representative relationships in the cores were equivalent to those from studies on coastal marine environments made in the Northern Hemisphere. The esterase enzymes in the sediment proved efficient in the mineralization of biopolymers, even with preferentially anaerobic metabolic physiology. Despite the lack of incipient geomicrobiological studies, the results highlighted the possible application of microbiology to a better understanding of geological processes.
Assuntos
Bactérias/isolamento & purificação , Biopolímeros/análise , Monitoramento Ambiental/métodos , Sedimentos Geológicos/microbiologia , Água do Mar/microbiologia , Oceano Atlântico , Bactérias/metabolismo , Biopolímeros/metabolismo , Brasil , Consumo de OxigênioRESUMO
Coprostanol (contribution characteristic from anthropogenic pollution) and other lipid biomarkers (sterols, fatty alcohols and fatty acids) were identified and quantified in recent sediment extracts from Rodrigo de Freitas Lagoon, a touristy spot of Rio de Janeiro-Brazil, using gas chromatography with mass selective detector (GC-MSD). The determination of lipid biomarkers profile indicates an autochthonous biogenic contribution due to the presence of phytoplankton, zooplankton, bacteria and dinoflagellates. The allochthonous biogenic contribution was confirmed by detection of biomarkers from higher plants in the sediments due to the influence of the Atlantic Forest inserted in the studied region. The concentration of the studied compounds varied from 5.53 to 216.47 microg.g(-1) for sterols, 0.47 to 5.35 microg.g(-1) for fatty alcohols, 20.15 to 66.22 microg.g(-1) for fatty acids and 0.08 to 3.98 microg.g(-1) for coprostanol. The presence of coprostanol was attributed to illegal untreated sewage discharge in the pluvial collector which ends up in the Lagoon.