MICROBIAL UTILIZATION OF LIPIDS IN LAKE WATER

This report evaluates the importance of lipids as a source of substrat es for metabolism of heterotrophic bacteria based on measurements of u ptake of [H-3]palmitic acid and lipase activity in lakes of differing degrees of eutrophication. The highest rates of utilization of lipids by bacteria (i.e. specific and actual rates of uptake of [H-3]palmitic acid and specific lipase activity) were observed in pelagic water of mesotrophic lake where the highest concentration and the shortest turn over time of natural pool of palmitic acid was found. Lipids in highly eutrophicated lakes were less important for metabolism of aquatic bac terial communities. Lipid content in lake water depended on species co mposition of plankton in the studied lakes.