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中文摘要：
在2007年枯水期（4月）和丰水期（11月）期间，对汕头沿岸海区沙壳虫进行了采样研究，探讨了沙壳虫的空间分布和种类组成。调查发现，除了表层海水温度以外，表层海水盐度、硝酸盐浓度、硅酸盐浓度均是春季低于秋季。在两个季节的5个采样点共鉴定出7属14种沙壳纤毛虫，其中优势种均为简单薄铃虫Leprotintinnussimple。秋季沙壳虫丰度低，多样性指数高；春季丰度高，多样性指数低。沙壳虫丰度与水体营养盐含量并无明显的相关性，但同盐度呈显著负相关（r2=0．63，P〈0．05），显示出沙壳纤毛虫对汕头海域对不同季节环境特征的响应。
英文摘要：
Two cruises were conducted to study the composition and seasonal variation of tintinnids （Protozoa： Ciliata） in Shantou coast water dudng spring and fall. Remarkable seasonal variations in environmental parameters, and tintinnids composition were observed. Tintinnids samples were enumerated and identified from 5 stations. 14 species belonging to 7 genuses of tintinnids were identified, and the dominate species was Leprotintinnus simple in these season. High tintinnids diversity and low abundance occurred in the fall, and on the contrary, low tintinnids diversity and high abundance occurred in the spring. No significant correlation occurred between tintinnids abundance and nutrients. Tintinnids abundance showed negative relationship with salinity （r2=0.63, P 〈 0.05）, maybe this was due to the cold raised water carried sum nutrients rise to the surface water in the fall, rich nutrients and high phytoplankton biomass decrease the importance of tintinnids in the energy flow of aquatic food web.
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