FREE FATTY-ACIDS OF SURFACE-FILM OF WATER IN THE SYDINSKY BAY OF THE KRASNOYARSK RESERVOIR

During the summer of 1990 composition and concentrations of free fatty acids (FFA) in the surface film of water were investigated. 23 FFA sp ecies were identified. Using cluster analysis in conjunction with ANOV AR correspondence of FFA contents in the surface film with seasonal pa tterns of pelagic plankton was proved. Three different groups of FFA w ere revealed, acids of every group had similar seasonal dynamics and p resumably were of similar origination. Data obtained gave a chance to suppose that main part of FFA were originated by exudation of living c ells of phytoplankton as well as postmortal exudation of bacterioplank ton. On the basis of FFA contents in a single sample from the surface film identification of sign of derivatives of phytoplankton biomass wa s suggested. This express-assay may be useful for monitoring.