The fatty acid composition of total lipids estuary and marine populations of Cystoseira barbata (Gooden. et Woodw.) C. Agardh and marine C. crinita (Desf.) Bory was investigated. It is shown that their composition and value are species-specific in nature. Wider adaptation to environmental conditions in C. barbata, compared to C. crinita, achieved by increased synthesis of unsaturated fatty acids and acid forming part sulpholipids.

Keywords: fatty acids, Cystoseira, Black Sea, estuary

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