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; Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo). CEAN, ruta prov. 61 km 3. 8371, Junín de los Andes, Neuquén, Argentina.
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.
Mar Pollut Bull. 2014 Feb 15;79(1-2):211-9. doi: 10.1016/j.marpolbul.2013.12.011. Epub 2013 Dec 25.
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.
比较了来自污水污染（SMA）和清洁地点的淡水贻贝（Dipolodon chilensis）的脂质和脂肪酸（FA）组成以及一些氧化应激参数。在贻贝和沉积物中分析了营养标记 FA。SMA 沉积物中含有丰富的饱和 FA（SAFA）、细菌和污水标记物，而硅藻标记物则降低了 50%。SMA 贻贝中 SAFA、支链 FA、20:5n-3（EPA）和 22:6n-3（DHA）的比例更高。D. chilensis 长期暴露于不断增加的富营养化中，影响了其脂质和 FA 组成。EPA 和 DHA 比例的增加可能是一种适应性反应，它可以提高抗应激能力，但也可能导致更高的脂质过氧化敏感性，TBARS、脂褐素（增加 20 倍）和 GSH 浓度在 SMA 贻贝中更高。FA 标记物表明，陆地植物碎屑和细菌是 D. chilensis 饮食中的重要项目。可以使用特定的 FA 作为营养标记物来追踪它们食物中的人为输入。
