| 摘要: |
| 于1994年1–7月在加拿大贝德福（Bedford）海洋研究所进行粘土矿物（halloysite）对尖刺拟菱形藻（Psuedonitzschia pungens f. multiseries）生长和藻毒素软骨藻酸（Domoic Acid，下简称DA）生成的影响研究。在Gompertz菌类生长方程的基础上，建立了尖刺拟菱形藻生长速率模型，得到各实验条件下的藻细胞最大生长速率。结果表明，粘土矿物对藻细胞的“遮荫效应”可导致藻细胞最大生长速率的降低，其幅度随粘土矿物浓度的增加而加大。对软骨藻酸的影响研究发现，在实验浓度范围内，粘土矿物可以抑制软骨藻酸的生成，最大抑制率可达30％以上。 |
| 关键词: 粘土矿物 赤潮藻 培养 藻毒素 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，A64951121号 |
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| IMPACT OF HALLOYSITE ON GROWTH OF PSUEDONITZSCHIA PUNGENS F. MULTISERIES AND PRODUCTION OF ALGAL TOXIN |
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YU Zhi-ming1, D V Subba Rao2,3,4,5
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1.Institute of Oceanology, The Chinese Academy of Sciences, Qingdao, 266071;2.Bedford Institute of Oceanography;3.P O Box 1006;4.Dartmouth N S;5.Canada B2Y4A2
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| Abstract: |
| The impact of clay (halloysite) on growth of a red tide organism, Psuedonitzschia pungens f. multiseries, and the production of domoic acid was studied in Bedford Institute of Oceanography, Canada, in January to July 1994. Based on the Gompertz equation of bacteria growth, a growth rate model of Psuedonitzschia pungens f. multiseries was established and maximum growth rates of algal cells were obtained under various experimental conditions. The results show that the growth of experimental species is consistent with Gompertz model, but the degree of consistency decreases with the increase of clay concentrations. The clay particles can cause a “mutual shading” effect on the growth of algal cells, which may reduce the maximum growth rate; and the decrease in the rate is enlarged with the increase of clay concentrations. The effect of the clay on domoic acid production is insignificant, even can be neglected if clay concentrations are below 10 mg/L. If clay concentrations are higher than this value, then the domoic acid production decreases with the increase of clay concentrations. Thus, the clay can inhibit domoic acid production, with a maximum inhibition efficiency of more than 30%. The reason for such an effect may be a change in nutrient contents in the medium due to clay addition and a decrease in photosynthesis due to the “mutual shading” effect. The result, together with those of the previous studies reported elsewhere, indicate that the clay can not only coagulate the red tide organisms to prevent it from breaking out, but also can decrease the production of some algal toxins. Hence, the use of the clay is a method with a vast range of applications to the control of the harmful red tide. |
| Key words: Clays, Red tide organisms, Culture, Algal toxin |
