中文摘要：

为掌握黄河口邻近水域中小型浮游动物的现状并弥补此类重要浮游生物类群在以往调查研究中的欠缺。于2010年9月在黄河口及其邻近海域用浅水II型浮游生物网采集了浮游动物样品，分析了中小型浮游动物的种类组成、丰度分布、优势种、生物多样性及群落结构。本次调查共鉴定浮游动物成体48种，浮游幼虫21类，桡足类和水螅水母为最主要的浮游动物类群，分别占浮游动物成体种数的37．5％和20．8％。浮游动物丰度为2300．1～266232．0个／m3，平均丰度为37074．3个／m3。优势种（类）8种．分别为夜光虫、强额拟哲水蚤、小拟哲水蚤、背针胸刺水蚤、异体住囊虫、桡足类无节幼虫、双壳类幼体以及腹足类幼体，其中夜光虫为研究水域最主要优势种。对各站位物种组成和丰度进行分析，调查水域中小型浮游动物可划分为4个组群，各组群的分布格局受到水温、盐度和海流的共同影响。该研究为此水域生态系统的长期变化研究提供了重要基础资料和参考依据。

英文摘要：

In order to stu distribution as well as the dy the meso- and micro-zooplankton species composition, abundance and assemblages relationship between zooplankton and the environmental factors, a survey was conducted and the zooplankton samples were collected using a shallow water style plankton net （mesh size 200μm） in Sep- tember 2010 in Yellow River Estuary and its adjacent area. A total of 48 zooplankton species and 21 pelagic larvae were identified, and they belong to the phylum Protozoa, Cnidaria, Ctenophora, Chordata, Arthropoda and Chae- tognatha. Copepod is the most dominant component of the Crustacea, and Crustacea and Cnidaria dominated the components of the zooplankton. The number percentage of pelagic copepod and Cnidaria species were 37.5% and 20.8% of total species, respectively. The abundance of zooplankton is from 2300.1 ind/m3 to 266232.0 ind/m3, and the main abundance was 37074.3 ind/m3. There are 8 dominant species/taxa in the survey area, which are Noctiluca scintillans, Paracalanus crassirostris, Paracalanus parvus, Centropages dorsispinatus, Oikopleura dioica, copepod nauplii, Gastropod post larve and Brival larvae. Noctiluca scintillans is the most dominant species in this survey. Based on the species composition and the abundance of each species in each station, four zooplankton assemblages were differentiated by using the method of cluster analysis. The distribution of different assemblages are mainly influenced by sea water temperature, salinity and current.