Composition and Content of Lipids and Fatty Acids in Alien Mollusks of the Genus Dreissena in the Kuybyshev Reservoir (Russia)

This paper presents the results of a study of the composition and content of lipids and fatty acids (FA) in soft tissues of invasive mollusks of the genus Dreissena inhabiting the Kuybyshev Reservoir. An identical composition of phospholipids (PL) and neutral lipids (NL) in bodies, mantle tissues, liver, and gills were found in the species D. polymorpha and D. bugensis occurring in different parts of the reservoir. Phosphatidylcholine (PC) and phosphatidylethanolamine (PEA) predominate in the PL structure with PC in the gills of D. polymorpha quantitatively exceeding PEA in the other organs. Among the NLs, cholesterol (CH) and triacylglycerides (TAG) dominate. High concentrations of fat in liver and whole individuals of both species indicate favorable habitat conditions in the areas studied. The FA profile of the mollusks is approximately the same; the most significant acids in the liver are palmitic acid, eicosenoic acid, eicosapentaenoic acid, and docosapentaenoic acid. D. polymorpha shows a predominance of polyunsaturated FA, whereas D. bugensis shows a predominance of monounsaturated FA.