Effects of Water Temperature and Light Intensity on Growth Rate and Death Rate of Freshwater Dinoflagellate Peridinium bipes.
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概要
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The technique of judging cells dead or alive with a fluorescence microscope has been adapted to studying the growth and death rates of a dinoflagellate Peridinium bipes which periodically formed freshwater red tides in the Asahi reservoir, Nara Prefecture. Clonal axenic population and synthetic medium (AFH) were used. The controlling factors of the cultivation were water temperature (5-25°C) and light intensity (0-114 μE m<SUP>-2</SUP> sec<SUP>-1</SUP>, 14L: 10D).<BR>Effects of water temperature and light intensity on the growth rate of P. bipes were expressed by the influential functions of water temperature and light intensity as follows : fT={(T/19.7) exp (1-T/19.7)}<SUP>4.08</SUP> and fI=I/(I+3.52). The growth rate of P. bipes was given by μm=μ<SUB>max</SUB> fT fI. The death rate of P. bipes was also written in the form dM=dT<SUB>=20</SUB>, I<SUB>=0</SUB> f'T f'I in which the influential functions of water temperature and light intensity were expressed as follows : f'T=1.11T<SUP>-20</SUP> and f'I=1-0.88I/(I+5.6). As a result of calculation by the functions mentioned above and the average values of dissolved nitrogen and dissolved phosphorus in the Asahi reservoir during 7 years, P. bipes was estimated to be capable of multiplying there as the water temperature was more than 5°C and the light intensity was more than 5μE m<SUP>-2</SUP> sec<SUP>-1</SUP>.<BR>No studies have ever tried to evaluate the relation among the death rate, water temperature and light intensity. These results were considered to yield useful information for developing red tide models.
- 日本陸水学会の論文
日本陸水学会 | 論文
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