| 摘要: |
| 分析了2004年2月珠江口小型原生动物(包括鞭毛虫、纤毛虫和异养甲藻)的分布特征，探讨了环境因子对其分布的影响。结果表明，鞭毛虫在珠江口的丰度为3.4×103～25.6×103个/mL，异养甲藻的丰度为11～312个/mL，纤毛虫的丰度为7～172个/mL。高丰度的原生动物主要集中在广州附近盐度为2～5的河口上段，而低丰度在外海盐度超过30的下段区域，原生动物的3个类群的丰度均从上段往下段呈递减的趋势。原生动物的分布特征与浮游植物叶绿素a的分布特征相似，原生动物 |
| 关键词: 原生动物 丰度分布特征 影响因素 珠江口 |
| DOI： |
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| 基金项目:国家自然科学基金项目(40730846,90711006) |
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| Preliminary study on distribution of micro-protozoa in the Pearl River Estuary and its controlling factors |
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| Abstract: |
| Based on the data obtained from a cruise in Feb. 2004， abundance， spatial distributions and controlling factors of nanoflagellates， heterotrophic dinoflagellates and ciliates in the surface layer in the Pearl River estuary were studied. Nanoflagellates abundance ranged from 3.4×103 to 25.6×103 cells/mL， while heterotrophic dinoflagellates ranged from 11 to 312 cells/mL and ciliates were from 7 to 172 cells/mL， respectively. High abundance of these protozoa was observed at upper stream of the estuary near the Guangzhou waters with low salinity (2 to 5 psu). Low abundance was observed at lower stream of the estuary with high salinity (>30 psu). The three groups of protozoa abundance decreased from upper estuary near Guangzhou to lower estuary. The distribution patterns of these protozoa abundance were similar to that of chlorophyll a， and they had a significant relationship with bacteria， indicating that phytoplankton and bacteria influence protozoa distribution patterns. Temperature and nutrients were not direct factors influencing protozoa distribution. High abundance of protozoa suggested that the Pearl River Estuary was eutrophic water. |
| Key words: protozoa abundance distribution controlling factors Pearl River Estuary |
