Comparison of Sterol Biomarkers for Sewage with other Measures in Victoria Harbour,B.C., Canada |
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| Institution: | 1. Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy;2. Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, 50134 Florence, Italy;1. The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan Road, Tianhe District, Guangzhou, 510640, China;2. Guangzhou Marine Geological Survey, Guangzhou 510760, China;3. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151, China;1. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India;2. Department of Earth and Atmospheric Sciences and the Purdue Climate Change Research Center, Purdue University, West Lafayette 47907, USA;3. Department of Botany, Calcutta University, Kolkata 700 019, India;1. Department of Animal Biology (Invertebrates) and Biodiversity Research Institute (IrBIO), Faculty of Biology, University of Barcelona, Barcelona, Catalunya, Spain;2. Department of Microbiology, Faculty of Biology, University of Barcelona, Barcelona, Catalunya, Spain;3. Department of Health Microbiology and Parasitology, Faculty of Pharmacy, University of Barcelona, Barcelona, Catalunya, Spain |
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| Abstract: | A lipid biomarker survey was conducted in Victoria Harbour, Canada, to compare the distribution of sewage-derived organic matter with existing results from bacterial studies. Previous surveys Miller (1993) Report prepared by Capital Regional District Engineering Department, Victoria, B.C. Canada and Milleret al. (1995) Report prepared by CRD Environmental Services Group and Aquatic Science Consultants Ltd., B.C., Canada] of sewage contamination in the harbour were based principally on infrequent faecal coliform counts. The use of lipid biomarkers to determine time-averaged concentrations of sewage components in sediments may be a more appropriate method for defining areas where sewage is causing environmental or human health risks. 5β-Coprostanol was measured together with other sterols, fatty acids and fatty alcohols. Generally, sewage contamination shown by these lipid biomarkers was coincident with high faecal coliform counts from previous studies. However, this survey suggests, contrary to faecal coliform counts, that Portage Inlet was a region where sewage had accumulated in the sediments, possibly due to nearby overflow facilities or tidal pumping. Although the bacterial counts were low, sewage-derived organic matter was accumulating in the slack areas. In sediments of the Gorge and West Bay there were low faecal biomarker concentrations; this was probably due to the strong tidal currents which do not allow faecal matter to settle in sediments. Faecal coliform counts, however, indicated poor water quality in these same regions but this probably reflects fresh discharges passing through this area without leading to settlement. |
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