Abstract
The filtration rate of a natural Zooplankton community at the time of the spring bloom in Akkeshi Bay was estimated using changes in concentration of chlorophyll a, of particulate carbon, and changes in cell numbers. The size range of phytoplankton cells utilized indicated that the maximum length of chain consumed depended upon the size-range of the Zooplankton community. Evidence for size-selection of food by animals is presented. The possible explanation of relation between the filtration efficiency — the ratio of respiration rate to the product of filtration rate and dissolved oxygen — and the quantity and quality of food is discussed. When there is a wide range of phytoplankton sizes or a small amount of phytoplankton, the filtration efficiency decreases.
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