| 摘要: |
| 采用多因子实验设计, 经三维ANOVA 统计分析( Tukey Test) , 研究了温度、盐度和光照强度对鱼毒类赤潮藻——赤潮异弯藻Heterosigma akashiwo 生长的影响。结果表明, 在实验范围温度( 12℃ 、19℃ 、25℃ 、32℃ ) , 盐度( 10、18、25、30、35) 和光照强度0.02 × 1016、0.08 × 1016、0.3 × 1016、1.6 × 1016quanta/( cm2?s) 内, 各温度和光照强度、以及低盐度( 10, 18) 和高盐度(35)之间, 藻生长率有极显著差异( P < 0.001) 。光照强度和温度、盐度和温度以及这三个因子之间存在极显著的相互作用( P < 0.001) , 而光照强度和盐度之间无显著的相互作用( P = 0.074 > 0105) , 藻生长的最适温度、光照、盐度条件分别为25℃、1.6 × 1016quanta/( cm2?s、10—35, 这时生长率为0.85d-1。 |
| 关键词: 赤潮异弯藻, 赤潮, 生长特性 |
| DOI： |
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| 基金项目:国家重点基础研究项目, 2001CB409709 号; 国家自然科学基金资助项目, 49906007 号, 39950001 号, 20177023 号;中国科学院知识创新工程资助项目,KZCX2-206 号; 香港特区政府PREPP 项目资助 |
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| GROWTH OF FISH-KILLING RED TIDE SPECIES RAPHIDOPHYTE HETEROSIGMA AKASHIWO |
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YAN Tian1, ZHOU Ming-Jiang1, QIAN Pei-Yuan2
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1.Institute of Oceanology, The Chinese Academy of Sciences;2.Biology Department, Hong Kong University of Sciences and Technology
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| Abstract: |
| Raphidophyte Heterosigma akashiwo is a fish-killing red tide species, which widely distributes in the world and has caused great economic loss in many countries such as Japan, Canada and New Zealand. In Dalian Bay, China, it caused red tide each summer during 1985—1987 and has been also found in Jiaozhou Bay and Dapeng Bay in recent years. In order to understand the mechanism of red tide formation, it is important to know more about its growth characteristics. This paper used 3-factor experiment design to study the effects of temperature, salinity and irradiance on the growth of this important species H. akashiwo ( isolated from Jiaozhou Bay, Qingdao, China). The results show that the growth of H. akashiwo was significantly different among temperatures ( 12, 19, 25, 32℃) , irradiance [ 0.02 × 1016, 0.08 × 1016, 0.3 × 1016, 1.6 × 1016 quanta/ ( cm2?s) ] and between low salinity ( 10, 18) and high salinity (35). There were interactive effects between any two of and among all three physical factors on the growth of H. akashiwo, except irradiance and salinity. The optimal growth condition of H. akashiwo was 25℃, 10—35and 1.6 × 1016 quanta/ ( cm2?s) with a growth rate of 0.85d-1 during the exponential growth phase. Therefore, H. akashiwo could divide at high rate and is more likely to bloom under high temperature and high illumination in summer, and this species is able to distribute widely in the ocean and estuaries due to its adaptation to wide salinities. The paper also discusses red tide formation mechanism and possible wide distribution of this species in China. To protect mariculture industry and fishery resources, more attention should be paid to this fish killing species. |
| Key words: Heterosigma akashiwo, Red tide, Growth |
