Phytosocyologic characterization and associated sediment in a mangrove area with impacts of oil spill, Todos os santos bay, Bahia, Brazil

This article presents the phytosociological characteristics of the São Paulo River estuary, northeastern part of Todosos Santos Bay, a mangrove area with impacts of oil spill as well as the physical-chemical composition of the plant of individuals associated with sediments. For qualitative, phytosociological research, the multiple plot method was applied, with a total of five 20x25 m2 plots. All living species present, Lagunculariaracemosa, Avicenniaschaueriana and Rhizophorae mangle identified with a breast height circumference (HBC) less than 15 cm were marked and their height and circumference values sampled. The results indicated that the mangrove ecosystem of the São Paulo estuary has a fringe face with intermediate size, indicating the species of A. schaueriana as dominant species. The granulate had a predominantly silty texture and low levels of the elements Ba, Co, Cr, Cu, Mn, Ni, Pb, V and Zn that are within the range of variation of this type of environment. Geochemical analysis of sediments reveals significant differences between plots. Diagnostic reasons pointed to a predominantly pyrogenic origin. Therefore, they consider mixed sources of polycyclic aromatic hydrocarbons (PAHs) contaminating this location as a result of the incomplete burning of fossil fuels and the presence of domestic effluents.