%0 Journal Article
%T Organic Extract Chemical Characterization of Sediments in Oyster and Mussel Culture Areas in the South Bay of Florian車polis, SC [Caracteriza  o Qu赤mica do Extrato Organico de Sedimentos em 芍reas de Cultivo de Ostras e Mexilh es na Ba赤a Sul de Florian車polis, SC]
%A Anderson M. Sewald
%A Martinho Raul
%A Natalia M. Rudorff
%A Carla Bonetti
%J Revista Virtual de Qu赤mica
%D 2012
%I Sociedade Brasileira de Qu赤mica
%X Santa Catarina is the greatest oyster and mussel producer in Brazil. The main cultivated species are the exotic oyster Crassostrea gigas, the native Crassostrea rhizophorae and the mussel Perna perna. Most of the production is concentrated in the capital city Florian車polis. This work aimed to assess possible alterations in the organic chemical composition of marine sediments caused by the intense cultures. For this purpose 17 sedimentary samples have been collected inside and outside of two oyster and mussel farms in the south bay region of Florian車polis. Values of atomic C/N ratio varied between 4.5 and 6.3, whereas H/C ratio averaged 0.8, indicating predominance of planktonic derived organic matter. Concentration of total phosphorus for all samples from both farms varied from 73 to 355  g g-1 of dry weight sediment. Below the producing areas the concentration of organic phosphorus (OP) was higher than the inorganic phosphorus (IP). Aliphatic hydrocarbons, extending from n-C11 to n-C40, were found in all samples of both regions. Sterols of planktonic and terrigenous sources were also found in all samples, with total concentrations extending from 3 to 22  g g-1. With the exception of cholesterol, no significant difference between concentration of sterols found in the samples below and outside of the culture areas could be associated with oyster production. The composition of monocarboxylic saturated and unsaturated acids were similar for both farms. The biodetritus, faeces and pseudofaeces organic extract of Crassostrea gigas oyster showed no sterols or monocarboxylic acids distinct from those identified in the sedimentary samples. In terms of chemical composition the increase in OP and cholesterol values in the sediments seem to be related to the cultures.
%K Oysters
%K lipids
%K sediment
%K Florian車polis.
%U http://www.uff.br/RVQ/index.php/rvq/article/view/231/249