中文摘要：

来自在 Changjiang (长江) 河口的车站的季节的 netzplankton 样品从 2004 年 5 月被收集到 2005 年 2 月。到全部的浮游动物丰富的优势种和他们的贡献是坚定的。而且，在咸度和丰富之间的关系与逐步的线性回归被学习。在整个年期间，咸度断然与丰富被相关温度否定地。，线性回归分析也在 2 月和 5 月在 8 月和 11 月为全部的丰富与咸度显示出高积极的关联，没有明显的关系被发现。最丰富的社区由浅海、略有盐味水的种类组成。北方经过(NP )( 咸度 < 5 ) 当北方布朗奇(NB ) 是有 12-28 的咸度范围的微咸水时，被淡水极大地冲淡。因而，在许多浮游动物的清楚的衰落沿着从在到在湖泊的地区的最小的高咸度的区域的最大值的河口 haloclines。全部的浮游动物丰富和生物资源比在所有季节的 NB 在 NP 是更低的。简言之，咸度各影响了许多浮游动物的种类，并且最终决定了全部的许多浮游动物。而且，在丰富的一座冬季山峰存在，它可能被繁荣 Sinocalanus sinensis 引起，在 Changjiang 河口的广泛地分布式的种。

英文摘要：

Seasonal netzplankton samples from stations in the Changjiang （Yangtze River） Estuary were collected from May, 2004 to February, 2005. The dominant species and their contribution to the total zooplankton abundance were determined. Moreover, the relationship between the salinity and abundance was studied with stepwise linear regression. During the whole year, the salinity was positively correlated with the abundance, while the temperature, negatively. Linear regression analysis showed also a high positive correlation with salinity for total abundance in August and November, while in February and May, no obvious relations were found. The most abundant community was composed of neritic and brackish-water species. The North Passage （NP） （salinity 〈5） was greatly diluted by freshwater while the North Branch （NB） was brackish water with salinity range of 12-28. Consequently, clear decline in abundance of zooplankton was along the estuarine haloclines from the maximum in the area of high salinity to the minimum in the limnetic zone. Total zooplankton abundance and biomass were lower in NP than the NB in all seasons. In short, the salinity influenced the abundance of each species of zooplankton, and ultimately determined the total abundance of zooplankton. Furthermore, a winter peak in the abundance existed, which might be caused by the flourishing of Sinocalanus sinensis, a widely distributed species in the Changjiang Estuary.