【摘要】 北塘河口位于天津新港东北15公里处。是典型的潮汐河口。氯度变化于3.5—19.1克/升之间,按照Redeke的方法分类,属于中盐水至海水范围。 本次调查共获浮游动物54种。分为4个生态类群:即淡水种、海水种、河口种和近岸低盐种。其中以河口种和近岸低盐种为主体类群。 自Ⅰ一Ⅵ站,随着盐分的降低,浮游动物的种类从33种降至19种。浮游动物的数量自Ⅰ—Ⅳ站逐渐降低,而Ⅴ、Ⅵ站又突然增加。这是因为不同种群对盐分适应能力的差异所致。Acartia pacifica是Ⅰ—Ⅳ站的优势种类,Schmarkeria poplesia是Ⅴ、Ⅵ站的优势种类。 本文讨论了Ⅳ站浮游动物数量减少与盐分和污染的关系。并提出Schmarkeria poplesia和Centropages sinensis可作为河口的指示种。更多还原

【Abstract】 The Beitang Estuary is situated about 15 Km in the northeast of Xingang Harbour in Tianjin. It received fresh and waste water from the new Yongdinghe river, the New Chaobaihe River, the Jiyunhe River, and the Tianjin Effluent Canal (Fig.1).From April-November of 1981,the samples were collected at low-tide time.The chlorinity varied between 3.5-19.1% in this area. According to Redeke’s classification, it lay between mesohaline to sea water.In the present investigation,some 54 species of zooplanktons were identified. These zooplanktons might be divided into four ecological groups, i.e.fresh-water, estuarine, neritic and oceanic. Among them the estuarine and neritic low-salinity species were the dominant species.The species of zooplankton varied from 33 to 19 with decreasing salinity from station Ⅰ to Ⅵ. The quantity of zooplankton decreased gradually from station 1 to Ⅳ,but it suddenly turned to increase at station Ⅴ and Ⅵ .That is because the adaptive capacities of each population to salinity are different.Acartia pacifica was a dominant species at station 1 to Ⅳ,while Schmackeria poplesia was a dominant species at station Ⅴ-Ⅵ.The decrease in the quantity of zooplankton at station Ⅳ is due to the influences of salinity and pollution.Schmackeria poplesia and Centropages sinensis may be used as indicators of the estuarine water.更多还原