| 摘要: |
| 2001-2002年的秋冬季节，于中国东南沿海的南澳岛周围海域突发了双环海链藻赤潮，该赤潮藻及其赤潮在中国都是首次记录。该赤潮藻以实心胶质块的群体形式出现，其群体一般呈球形或椭球形，常为茶褐色，大小不一，直径多数在2-3mm之间，最小的不到0.1mm。最大的约有5mm。胶质块由双环海链藻和数种羽纹硅藻组成，前者分布于外层，后者包埋其中。双环海链藻的细胞密度最大达1.75×10 cells/L，占浮游植物总细胞数的78.8% 。如把包埋其中的羽纹硅藻考虑进去，赤潮藻胶质块的组成细胞总密度则高达2.28×107cells/L以上。占浮游植物总细胞数的95.9%。赤潮藻的密度由湾内向外海呈显著递减趋势，与营养盐的平面分布格局相反。该赤潮起源于外海，赤潮发生机制可能与2001-2002厄尔尼诺年导致的水温异常升高有关。 |
| 关键词: 赤潮，双环海链藻(Thalassiosira diporocyclus)，南澳岛，厄尔尼诺 |
| DOI： |
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| 基金项目:广东省重大科技兴海项目，A200005F02号；广东省自然科学基金项目，021260号 |
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| FIRST RECORDING OF THALASSIOSIRA DIPOROCYCLUS BLOOM IN THE SOUTHEAST CHINA SEA |
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CHEN Shan-Wen1, GAO Ya-Hui2, DU Hong1, DONG Qiao-Xiang3, HUANG Chang-Jiang1
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1.Institute of Aquatic Biotechnology and Environrrvental Resource Protection,Shantou University;2.Department of Biology,Xiamen University;3.Aquaculture Research Station,Louisiana Agricultural Experiment Station,Louisiana State University Agriculture Center
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| Abstract: |
| A bloom of colony-forming diatom of the genus Thalassiosira diporocyclus occurred in Nan’ao Island in early 2002.To our knowledge, this is the first recording of a T.diporocyclus bloom in the Southeast China Sea. The colony was solid, light brown and spherical or ova1．The colony size ranged from less than 0.1mm to 5mm．The majority were around 2-3mm．In the outer layers，the colony was mainly composed of T.diporocyclus，while some pennate diatoms were embedded in the center．The highest cell density of T.diporocyclus alone was 1.75× 10 cells/L, accounting for 78.8% of total phytoplankton．This increased to 2．28×10 cells/L(95.9% )when pennate diatoms inside the colony were included．Results indicate that the abundance and cell density of T.diporocyclus increased from the inner bay to the open waters during the bloom and reversely correlated with the distribution trend of the abundant nutrients．The bloom originated in open waters，and its occurrence is probably related to abnormally high water temperatures resulting from the 2001-2002 El Ni?o event． |
| Key words: Red-tide, Thalassiosira diporocyclus, Nan’ao Island, El N?o event |
