ツヅミモStaurastrum dorsidentiferum var. ornatumの培養と増殖

概要

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We have isolated a green alga, Staurastrum var, ornatum, which is a dominant species in Lake Biwa from summer to early autumn, and have investigated effects of environmental conditions on the growth of this alga. In this study, we adopted the total chlorophyll (chlorophyll a and b) as an indicator of the algal mass and revealed following properties : 1) The optimum temperature is about 25℃ judging from the growth rate and the final yield. 2) The luminous intensity becomes saturated with about 4,000 luxes. 3) The optimum condition of pH in the growth medium is about 8.0. 4) The optimum concentration of nitrogen (NO3-N, expressed by nitrogen weight) is about 19 ppm. The excess of nitrogen in the medium is rather inhibitory. The shortage decreases the final yield. 5) The optimum concentration of phosphorus (PO4-P, expressed as phosphorus weight) is 3.0-30 ppm. These results are discussed in relation to the water condition during the period when Staurastrum dorsidentiferum var. ornatum dominates in Lake Biwa.
滋賀大学の論文
1985-03-20