赤潮鞭毛藻に関する研究-7-1978年伊勢湾に出現したProrocentrum micans(levantinoides Type)
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概要
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Extensive bloom of Prorocenｔrum micans (levantinoides type) oｃcurred in Ise Bay,in June 1978. The bloom spread out almost all over the bay and continued for a month in accompanying an offensive odor and mortality of many marine life. The organism waｓ isolated from the water and obtained in axenic culture by micropipette washings. P. micans was euryhaline and preferred higher salinity compared with other neritic red tide flagellates. The optimal salinity for growth was 31.0 ‰ S. The organism could tolerate a wide range of pH changes, and grew moderately well at pH 7.0-9.0. Nitrate, ammonium salt,urea,glycine, asparagine were utilized as N-sources and both inorganic and organic phosphate were utilized as P-sources. P. micans needed only vitamin B12 for growth. Thiamine accelerated the growth in presence of B12. The critical consentration of B12 for growth was 10 ng/l in presence of thiamine, and 20 ng/l without thiamine. The growth was stimulated with organic substances such as adenine, methylcytosine, thymine, uracil, yeastolate,trypticase, yeast extract, thioton, DNA, ando sucrose. Enrichment of the seawater ( Ise Bay) with nitrate and phosphate had relatively little effect, however, with nitrate, phosphate, and vitamin B12 enhanced the growth, morever the addition of chelated iron or acid extract (at pH 3.0) of the marine mud greatly increased the growth. It is probable, therefore, that B12, organometallic compounds, and organic substances play a significant role in blooming of organism in Ise Bay.
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