Effects of sewage discharges on lipid and fatty acid composition of the Patagonian bivalve Diplodon chilensis |
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| Institution: | 1. Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, INQUIBICEN-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Pab. II, Ciudad Universitaria, 1428 Buenos Aires, Argentina;2. Instituto de Investigaciones Bioquímicas de la Plata (INIBIOLP), Facultad de Ciencias Médicas, Universidad Nacional de La Plata – CONICET CCT La Plata, Av. 60 y 120, 1900 La Plata, Argentina;3. Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo). CEAN, ruta prov. 61 km 3. 8371, Junín de los Andes, Neuquén, Argentina;1. IQUIBICEN-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160 CABA, Argentina;2. Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160 CABA, Argentina;3. Laboratorio de Ecotoxicología Acuática (INBIOMA, CONICET-UNCo), Junín de los Andes, Neuquén, Argentina;1. Wise Laboratory of Environmental and Genetic Toxicology, University of Southern Maine, P.O. Box 9300, 96 Falmouth St., Portland, ME 04104, USA;2. Maine Center for Toxicology and Environmental Health, University of Southern Maine, P.O. Box 9300, 96 Falmouth St., Portland, ME 04104, USA;3. Department of Applied Medical Sciences, University of Southern Maine, 178 Science Building, Portland, ME 04104, USA;4. Center for Environmental Sciences and Engineering, University of Connecticut, 3107 Horsebarn Hill Road, U-4210, Storrs, CT 06269, USA;5. Yale School of Public Health, P.O. Box 208034, 60 College Street, New Haven, CT 06520, USA;1. AZTI – Txatxarramendi ugartea z/g, 48395 Sukarrieta, Spain;2. AZTI – Herrera Kaia, Portualdea z/g, 20110 Pasaia, Spain;3. MARE – Marine and Evironmental Sciences Centre, Departamento de Ciências e Engenharia, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;1. Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, USA;2. Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA |
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| Abstract: | Lipid and fatty acid (FA) composition and selected oxidative stress parameters of freshwater clams (Dipolodon chilensis), from a sewage-polluted (SMA) and a clean site, were compared. Trophic markers FA were analyzed in clams and sediment. Saturated FA (SAFA), and bacteria and sewage markers were abundant in SMA sediments, while diatom markers were 50% lower. Proportions of SAFA, branched FA, 20:5n ? 3 (EPA) and 22:6n ? 3 (DHA) were higher in SMA clams. Chronic exposure of D. chilensis to increasing eutrophication affected its lipid and FA composition. The increase in EPA and DHA proportions could be an adaptive response, which increases stress resistance but could also lead to higher susceptibility to lipid peroxidation TBARS, lipofuscins (20-fold) and GSH concentrations were higher in SMA clams. FA markers indicated terrestrial plant detritus and bacteria are important items in D. chilensis diet. Anthropogenic input in their food could be traced using specific FA as trophic markers. |
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| Keywords: | Freshwater bivalve Pollution Domestic effluents Oxidative stress Lipofuscins Fatty acid markers |
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