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Title: Oxidative Stress and Biochemical Composition in Donax Trunculus (Mollusca, Bivalvia) from the Gulf of Annaba (Algeria)
Authors: Karima Sifi; Akila Amira ; Noureddine Soltani
Aff: Laboratory of Applied Animal Biology Faculty of Sciences, Department of Biology University of Annaba 23000-Annaba, Algeria
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Keywords: Donax Trunculus; Pollution; Biomonitoring; Oxidative Stress; Glutathione; Malondialdehyde; Proteins; Lipids; Carbohydrates
Abstract:contaminated by several pollutants from urban, agricultural, harbor and industrial activities. The aim of our study consisted to test two biomarkers of oxidative stress, glutathione (GSH) and malondialdehyde (MDA), and to determine the main biochemical components (proteins, lipids, and carbohydrates) in the mantle of an edible species Donax trunculus L. (Mollusca, Bivalvia) associated with environmental pollution. Samples were monthly collected in 2011 at two sites in the Annaba gulf: El Battah, a relatively clean site and Sidi Salem, a polluted site. The results showed a significant decrease in GSH amounts and a significant increase in MDA levels in Sidi Salem compared to El Battah. Furthermore, seasonal evaluation of our biomarkers, indicated that GSH levels are lower and MDA rates are higher in winter, regardless of the sampling site. The biochemical analysis revealed a significant decrease in protein, lipid and carbohydrate amounts in Sidi Salem comparatively with El Battah. In addition, the higher levels in biochemical components are recorded in spring and the lower rates in autumn and winter, this is probably related to respectively the beginning and the end of the reproduction period. Our results suggest an influence of the site quality on the health status of D. trunculus. Thus, the difference noted between the two sites may be due to thier pollution level. A level of pollution in Sidi Salem induced an oxidative stress associated with a mobilization of energetic metabolism for detoxification or for physiological processes such as growth or reproduction. Moreover, D. trunculus appears as a suitable sentinel species for the assessment of the ecotoxicological risk linked to the pollution.