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ABSTRACT
A simple cultivation method was used to describe bacterial communities according to the concept of r- and K-strategists. Bacterial colonies appearing on agar plates were daily quantified for a period of six days. Significant differences were found in the distribution in relation of water depth layers and of organic content. In general microbial community on the surface was dominated by r-strategists and following depth gradient was replaced by a community dominated by K-strategists (in the hypolimnion). Later-on in the bottom layer, bacterial community was dominated again by r-strategists. Eco-physiological index showed that with depth distribution of r- and K-strategists became more even while in the epilimnion both groups have uneven distribution.