Abstract
Lipid compounds from five sediment-water interface samples and a sediment core with 75 cm depth were used to assess sources of organic matter in Conceição Lagoon, located on Santa Catarina Island. The results which were based on the molar C:N:P ratios, relative abundance of sterols (dominated by the C27 sterols), n-alkanols (0.2-1.2 µg g-1), n-alkanes (0.4-5.0 µg g-1) and the Carbon Preference Index (CPI), indicated that the organic matter is predominantly of terrestrial origin (C/N > 10 and CPI > 2). Total phosphorus (TP, average 5.20 µmol g-1) and organic carbon (TOC, average 2.90 mmol g-1) contents were well correlated with the silt and clay fractions at all locations. In the sediment core, chronologically dated with the radionuclide 210Pb, the depth interval from 55 to 75 cm was dominated by the sand fraction (> 50%). However, parameters such as TOC, TP and n-alkane contents increased considerably at this depth suggesting a change in organic matter input sources.
Highlights
Lipid compounds constitute a minor but important fraction of the total organic matter in aquatic sediments
Our study provides background information dealing with biogenic parameters such as total organic carbon (TOC), nitrogen (N) and phosphorus and the nature and Distribution of Lipid Compounds in Sediments from Conceição Lagoon
These values are higher than those found in the sediments of Ratones Mangrove (59 to 61%), with no contribution of anthropogenic sources, but similar to those reported for the highly sewage contaminated sediments of Itacorubi Mangrove (79-87%), both located on Santa Catarina Island.[22]
Summary
Lipid compounds constitute a minor but important fraction of the total organic matter in aquatic sediments. Sources of lipids include primary production, inputs of terrestrial material from the watershed region and products associated with microbial activity in the water and sediment.[1,2] Of particular relevance to sediments of estuaries and lagoons are organic compounds such as ketones, sterols, fatty acids, hydroxy acids, n-alkanes and n-alkanols.[3,4] These preserved components are known as geolipids or biomarkers, because they can be linked with biological precursor compounds. Organic compounds are subject to extensive biochemical. Several reports have emphasized the great importance of Conceição Lagoon as a tourist resort and a fishing resource for the local people.[7,8] Our study provides background information dealing with biogenic parameters such as total organic carbon (TOC), nitrogen (N) and phosphorus (total, TP; organic, OP; and inorganic, IP) and the nature and Distribution of Lipid Compounds in Sediments from Conceição Lagoon
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