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Studies on Red Tide and Toxic Phytoplankton in Coastal Areas of South Western Pacific

西南太平洋沿岸赤潮及有毒浮游植物研究

基本信息

批准号：
01041066
负责人：
OKAICHI Tomotoshi
金额：
--
依托单位：
Kagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Overseas Scientific Survey.
财政年份：
1989
资助国家：
日本
起止时间：
1989 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01041066/
关键词：
Red Tide Toxic Phytoplankton Pyrodinium Alexandrium Noctiluca Gulf of Thailand Chao Phraya River Eutrophication

项目摘要

The objective of the studies on Red Tide and Toxic Phytoplankton in Coastal Areas of South Western Pacific is to make clear the relationship between eutrophication and outbreaks of red tide phenomena in south east asia.According to the report on the appearance of Pyrodinium bahamense var. compressa, which cause PSP toxication, along the coast of Bandar Beri Segawan of Burnei Darussalum, the survey carried out the end of May, 1989. The theacate shell excysted was found in bottom sediment. In Masinrok Bay which locate north east of Manila, Philippines about 100 cysts of P.bahamense in 1 g bottom mud were counted and the red tide is anticipated in next year. The survey in Gulf of Thailand and Chao Phraya River were carry on November 1989. Five dinoflagellates were isolated. Among them Chattonella sp. cf. marina was the first isolation from the water of Gulf of Thailand. Noctilica scintillas of the Gulf of Thailand have a symbiotic alga, Pedinomonas noctiluca. The culture of P.noctiluca was also tried and the medium devised by the survey sustained the culture of species at about 2 weeks. Nutrient concentrations in water of Chao Phraya River and the Gulf of Thailand were also estimated. Chao Phraya River water were eutrophicated in high levels but they was considerably decreased in sea water. This seems to be caused by the adsorption of the nutrients on suspended matter at the river mouth. The deterioration of sediments near the river mouth seems to be proceeding to deteriorate.

西南太平洋沿岸赤潮和有毒浮游植物研究的目的是弄清富营养化与东南亚赤潮爆发的关系。1989年5月底，在缅甸达鲁萨兰国的班达尔湾沿岸沿着，对引起PSP中毒的compressa进行了调查。在底质中发现了脱囊的贝壳。在菲律宾马尼拉东北部的马辛罗克湾，每克底泥中约有100个巴哈马贝氏藻囊，预计明年将发生赤潮。1989年11月在泰国湾和湄南河进行了调查。分离出5种甲藻。其中Chattonella sp. cf.码头是第一个与泰国湾水域隔离的地方。泰国湾的夜光藻有一种共生菌，Pedinomonasacidtiluca。还尝试了P.acetuluca的培养，并且通过调查设计的培养基维持了约2周的物种培养。对湄南河和泰国湾的营养盐浓度也进行了估算。湄南河水体富营养化程度较高，但海水中的富营养化程度明显降低。这可能是河口悬浮物对营养盐的吸附作用所致。河口附近沉积物的恶化似乎正在继续恶化。