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九州沿岸に分布する有害渦鞭毛藻Cochlodinium polykrikoidesの生理生態学的研究


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タイトル: 九州沿岸に分布する有害渦鞭毛藻Cochlodinium polykrikoidesの生理生態学的研究
その他のタイトル: Physiological Ecology of a Harmful Dinoflagellate Cochlodinium Polykrikoides Occurring in Coastal Waters of Kyushu, Japan
著者: 山砥, 稔文
著者(別表記) : Yamatogi, Toshifumi
発行日: 2006年 3月20日
引用: (2006-03-20)
抄録: An unarmored chain-forming dinoflagellate Cochlodinium polykrikoides Margalef is one of important harmful red tide organisms causing mass mortality of cultured fish in western Japanese and southern Korean coastal waters. This species was first recognized in the Yatsushiro Sound in Kyushu, West Japan, in 1978 with serious economic damages to yellow-tail aquaculture industries. Thereafter this species has been continuously expanding its habitat and giving damages to aquaculture industries in coastal waters, mainly in the Kyushu. However, its biological characteristics such as optimum environmental conditions for reproduction and lifehistory are still unclear. Using clones of nine strains of C. polykrikoides isolated from coastalwaters Kyushu in 2002-2005, the growth rates of C. polykrikoides were examined in 60different combinations of temperature (10-32.5 °C) and salinity (16-36 psu) under a lightcondition of 80 μmol m-2 s-1 with a 14 h light and 10 h dark cycle. C. polykrikoides grew wellat a temperature range of 15-30°C, a salinity range of 16-36 psu. The highest growth rate wasobtained in the combination of 25-27.5°C and 28-32 psu with the maximum growth rate (μm ) of0.56-0.64day-1. The effect of light intensity on the growth of C. polykrikoides was studied atseven different levels ranging from 10 to 140 jamol m-2 s-1 with 14h:10h light: dark photo cycleat 25°C. C. polykrikoides grew well at an irradiance of 20 umol m-2 s-1 and its growth wassaturated at 120 μmol m-2 s-1. The half-saturation constant for the growth of light intensity(Ks), μm and threshold value (I0) were 29.2 u.mol m-2 s-1 , 0.54 day-1 and 4.5 μmol m-2 s-1,respectively. According to incubation experiments, C. polykrikoides can form red tides at thewarm and high salinity environment. To understand an initial growth of this species, it isimportant to clarify the seasonal occurrence particularly low temperature periods. C,polykrikoidesccurred from February 2004 to March 2005 in Usuka Bay, west Kyushu. The highest cell densitywas recorded in September, with water temperature and salinity being about 25°C and 33.5 psu.From April of 2004 to March of 2005, the motile cells of C. polykrikoides were continuouslyobserved at the temperature range of 12.3-27.6°C and salinity range of 32.52-34.40 psu. Thesefiled evidences suggest that C. polykrikoides can form red tides during warm water seasons withthe high salinity environment and its vegetative cells can be over winter in enclosed bays such asUsuka Bay in West Japan.
記述: 長崎大学学位論文 学位記番号:博(生)甲第83号 博士(水産学) 学位授与年月日:平成18年3月20日
URI: http://hdl.handle.net/10069/7333
関連リンク : http://hdl.handle.net/10069/7010
資料タイプ: Thesis or Dissertation
出現コレクション:090 学位論文

引用URI : http://hdl.handle.net/10069/7333

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