Analysis of the Growth Factor of Freshwater Dinoflagellate Peridinium bipes fo. occultatum by Numerical Simulation Model.
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Freshwater red tides caused by a dinoflagellate, Peridinium bipes fo. occultatum, occur frequently especially in man-made lakes in western Japan. It was suggested that nutrients such as phosphorus and nitrogen supplied from inflowing rivers might be the main factors controlling the growth of P. bipes in these reservoirs. The following numerical simulation model for P. bipes was constructed to test this assumption :<BR>N<SUB>1+1</SUB>=Ni×exp(μmax×f<SUB>T</SUB>×f<SUB>P</SUB>×f<SUB>N</SUB>-g<SUB>T</SUB>)<BR>f<SUB>T</SUB>=[(WT/20)×exp(1-WT/20)]<SUP>12</SUP><BR>f<SUB>P</SUB>=C<SUB>P</SUB>/ (C<SUB>P</SUB>+0.005)<BR>f<SUB>N</SUB>=C<SUB>N</SUB>/(C<SUB>N</SUB>+0.051)<BR>g<SUB>T</SUB>=aWT<SUP>2</SUP>+bWT+c<BR>The standing crops of P. bipes were calculated for the Asahi Reservoir in Nara Prefecture over the period from 1982 to 1988. The seasonal and yearly fluctuations of the standing crop predicted by the model agreed well with measurements. For the years excluding 1983, P. bipes grew from May to November with peaks in growth rate from June to August and with peaks in standing crop from September to November. Seasonal fluctuations of growth were mainly dependent on water temperature because the net growth rate had a positive correlation with f<SUB>T</SUB>.<BR>Further examination of three factors (f<SUB>P</SUB>, f<SUB>N</SUB> and f<SUB>T</SUB>) indicated that water temperature was the limiting factor for the period from December to April and phosphorus for the period from May to November. For 1982-1988 excluding 1983, mean net Peridinium growth rate over the period from May to November was positively correlated with the mean value of f<SUB>P</SUB>×f<SUB>N</SUB>. A sensitivity analysis indicated that the fluctuations of the standing crop between years was mainly dependent on river inflow. In this model, the concentrations of phosphorus and nitrogen were estimated by the volume of river inflow. These results indicated that the growth of P. bipes was controlled by river inflow volume. During 1983, the growth of P. bipes peaked between late March and early April, probably due to germination of the cysts that were produced during the previous year.
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日本陸水学会 | 論文
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