Studies on harmful phytoplanktons in South East Asia

1989年，在Zambales Masinloc湾和马尼拉湾Bataan Remay沿海水域进行化学环境研究的同时，开展了调查巴哈梅二镨和有毒贝类分布的研究。1992年2月17日至19日在Masinloc湾的4个监测站进行了测量。地表水盐度为33.6 ~ 35.4*。位于马辛洛克湾南部的班班湾外中下层，检测到略低盐度（33.6 ~ 34.6*）和高浓度硅酸盐（SiO_2为0.153 ~ 0.562 mg/l）的水体。悬浮固体浓度为1.2 ~ 4.7 mg/l，浮游总色素浓度为1.1 ~ 5.7 mg/l。在马辛洛克湾东北部地区，利用沉积物捕集器测量的质量通量为1.73 g/m^2/d。1991年4 ~ 6月是巴哈梅花期，5月密度最高，达18.9万株/l。开花在八月初就结束了，可能是由于稠密的火山灰和该地区气候条件的变化还有皮纳图博火山的喷发。该物种的开花在12月开始再次出现。今年2月，日本研究小组进行实地调查时，在班班湾内部4米深度和外部10米深度分别观察到21,860个和29,220个细胞/l的密度。然而。水变色不明显。沿着里梅岛海岸的调查，巴丹岛。马尼拉湾军演于2月19日至20日进行。地表水盐度27.7 ~ 33.6 *，底水盐度23.03 *。硅酸盐在0.38 ~ 0.72 mg/l范围内，SiO_2含量较高。悬浮固体和浮游总色素浓度分别为0.45 ~ 8.26mg/l和1.0 ~ 9.5 mg/l。质量通量为3.61 g/m^2/day。这些数值似乎来自于海湾的富营养化。1991年6月，黎may海域出现赤潮，细胞密度达7,54.9万个细胞/l。1992年2月，该物种出现的数量很低，丽梅海域80个细胞/l，猎户座海域1360个细胞/l。将bahamense var. compressum的细胞分离后接种于富营养化海水培养基Tl中，大部分细胞仍存活，正在进行培养研究。在马辛洛克湾采集的双壳类动物麻痹性贝类毒素的分析正在进行中。在马辛洛克湾和马尼拉湾共采集了4个长岩心，以阐明近几十年来甲藻囊群的演替。累积的研究结果将被印刷出来，预计将作为西太平洋地区赤潮和贝类中毒调查手册的材料。少

In 1989 the studies were developed to survey the distribution of Pyrodimium bahamense and toxic shellfish together with the chemical environmental research in Masinloc Bay, Zambales and the coastal water area of Remay, Bataan of Manila Bay.Surveys in Masinloc Bay were carried out at 4 stations on February 17-19, 1992. Salinities of the surface water were 33.6-35.4*. The water mass of slightly low salinity (33.6-34.6*) and high concentration of silicate (0.153-0.562 mg/l as SiO_2) were detected in middle and lower layer outside Bamban Bay where located at the southern part of Masinloc Bay. The concentration of suspended solid and total planktonic pigments were 1.2-4.7 mg/l and 1.1-5.7 mug/l respectively. Mass flux which was measured by using the sediment traps was 1.73 g/m^2/day at north-east region of Masinloc Bay. P. bahamense var. essum bloomed from April to June, 1991 and reached the maximum density of 189, 000 cells/l in May. The blooming, was terminated in early August, maybe, by … More the effect of the dense ash falls and changes in weather conditions of the area the eruption of Mt. Pinatubo. The bloom of the species started to recur again in December. In February when the Japanese team made a field survey, dense density of 21, 860 cells/l and 29, 220 cells/l were observed at 4m-depth inside and 10m-depth outside Bamban Bay, respectively. However. water discoloration was not prominent.The survey along the coast of Rimay, Bataan. Manila Bay was carried out on February 19-20. The salinities were 27.7-33.6 * in surface water and 23.03 * in bottom water. Silicate were in the high range of 0.38-0.72 mg/l as SiO_2. The concentrations of suspended solid and total planktonic pigments were 0.45-8.26mg/l and 1.0-9.5 mug/l respectively. Mass flux was 3.61 g/m^2/day. These values seemed to be derived from the eutrophication of the Bay. P. bahamense var. essum bloomed and appeared as red tide off Limay in June, 1991 and the cell density was counted as much as 7, 549, 000 cells/l. In February, 1992, the species appeared in quite low quantities, 80 cells/l off Limay, and 1, 360 cells/l off Orion.Cells of P. bahamense var. compressum were isolated and inoculated into enriched sea water medium Tl and then the most of them are still alive and under culture investigation. The analysis of Paralytic shellfish poison of the bivalves collected at Masinloc Bay is under progress.Totally four long cores were collected in Masinloc Bay and Manila Bay in order to clarify the succession of the dinoflagellate cyst assemblage since the last few decades.Cumulative results of the research will be printed and that should be expected as materials for the survey manual on red tide and shellfish poisoning in western pacific region. Less