Seasonal Succession of Phytoplankton in Sagami Reservoir from 1973 to 1977
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概要
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Seasonal succession of phytoplankton was investigated for five years (1973-1977) in Sagami Reservoir. Surface waters were sampled once or twice a week at the station close to the outlet. Chlorophyll <I>a</I> content was less than 10 mg/m<SUP>3</SUP> during the winter, and showed many high peaks successively from April to October. Rapid recovery of dissolved silica concentration was observed after the decline of diatom populations. It is suggested that such a rapid recovery is due to the rapid supply of dissolved silica from the hypolimnion through which a large volume of inflow-water rich in nutrients (1/13.5 per day of the effective storage capacity) passes. In the same way other nutrients are assumed to be supplied rapidly. Thus, these conditions may be explain the appearance of many peaks of chlorophyll <I>a</I>. <BR>The first peak of chlorophyll <I>a</I> corresponded to the increase of <I>Cryptomonas</I> sp.. Spring outburst of diatoms occurred in late April, and seven principal diatoms increased successively until late June. It is suggested that the main factor in the outburst is a decrease in the rate of diatom loss from the epilimnion due to the change in the flow rate of the river water. Growth of blue-green algae was influenced frequently by flooding in summer, while blooms of blue-green algae were observed until mid October in years without a flood. In the autumn <I>Cyclotella</I> sp. were usually predominant. Seasonal succession of phytoplankton in Sagami Reservoir was heavily influenced by the inflow of a large volume of eutrophic river-water.
- 日本陸水学会の論文
日本陸水学会 | 論文
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