Metals in sediments and benthic organisms in the Mersey estuary |
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| Institution: | 1. Oil and POPs Research Group, Korea Institute of Ocean Science and Technology, Geoje 53201, Republic of Korea;2. Department of Marine Environmental Science, Korea University of Science and Technology, Daejeon 34113, Republic of Korea;1. Institute of Oceanology, Polish Academy of Sciences, Marine Chemistry and Biochemistry Department, ul. Powstańców Warszawy 55, 81-712 Sopot, Poland;2. CIIMAR, Laboratory of Ecophysiology, Rua dos Bragas 289, 4050-123 Porto, Portugal;3. Helmholtz Centre for Environmental Research – UFZ, Department of Cell Toxicology, Permoserstrasse 15, 04318 Leipzig, Germany;4. Eawag, Department of Environmental Toxicology, Überlandstrasse 133, P.O. Box 611, 8600 Dübendorf, Switzerland;5. School of Architecture, Civil and Environmental Engineering (ENAC), EPF Lausanne, GC A2 392 (Building GC), Station 18, CH-1015 Lausanne, Switzerland;1. Faculty of Interdisciplinary Studies, Institute of Social Ecology, Alpen-Adria-Universität Klagenfurt, Schottenfeldgasse 29, 1070 Vienna, Austria;2. Dept. of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA;3. Aquatic Ecosystems Program, IRTA, Carretera Poble Nou, km 5.5, 43540 Sant Carles de la Rapita, Catalonia, Spain |
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| Abstract: | Concentrations of twelve metals were determined in sediments, seaweed (Fucus vesiculosus), winkles (Littorina littorea), polychaetes (Nereis diversicolor), suspension feeding bivalves (Mytilus edulis, Cerastoderma edule) and deposit feeding bivalves (Macoma balthica, Scrobicularia plana) collected from the Mersey estuary between April 1980 and June 1984.Sediments and organisms in the Mersey are moderately contaminated with most of the metals measured, but mercury concentrations are consistently higher than in other United Kingdom estuaries. Comparisons with other sites in the North West of England indicate that mercury residues in organisms, though primarily dependent on sediment concentrations, are also influenced by complexation with particulate organic matter which reduces the availability of mercury. The biological availability of arsenic in Mersey sediments is similarly influenced by complexation with iron oxyhydroxides.Nereis diversicolor and Macoma balthica are the most suitable indicator species in terms of abundance and widespread distribution along the estuary, and, for the majority of metals, tissue concentrations increase upstream, reflecting corresponding gradients in sediment contamination. However mid-estuarine peaks for tin, chromium copper and nickel in Nereis indicate more localised inputs to the estuary. Correlations between lead in sediments and organisms are poor; it is suggested that hydrophilic alkyl lead compounds may be the predominant biologically available forms.Progressive reductions in mercury contamination in sediments and mercury and lead in organisms have occurred in recent years, which coincide with efforts to reduce inputs of these metals to teh Mersey estuary. |
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