The planktonic bacterial populations in the surface water of the hypertrophic Himon‐ya Pond were separated into four fractions (>35 μm, 35‐5 μm, 5–1 μm, and <1 μm) by size fractionation of suspended particles in the water. The seasonal variations in bacterial numbers over a two year period differed for each of the four fractions. The bacterial counts in the >35 μm fraction were mainly dependent on the biomass of Microcystis colonies. Their peaks were observed in summer. In the 35‐5 μm and 5–1 μm fractions, several peaks in bacterial numbers were observed, influenced by the quality and quantity of the particles associated with the bacteria. The bacterial counts in the <1 μm fraction contributed a high proportion of the total throughout all seasons except summer.
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Toshifumi Konda (1984) studied this question.