2006年夏季珠江口浮游动物群落结构特征分析

2006年8月对珠江8大入海口浮游动物群落的种类组成和数量平面分布进行了调查。经鉴定有浮游动物57种,其中桡足类占优势,有20种;其次为轮虫和枝角类,分别为18和8种;此外,被囊动物2种,原生动物、多毛类、异足类、水母类、糠虾类各1种;还有阶段性各种幼虫以及未知种类2种。调查期间各站位均出现的种类有萼花臂尾轮虫（Brachionus calyciflorus）、镰状臂尾轮虫（B.falcatus）和长额象鼻溞（Bosmina lon-girostris）。浮游动物的种数变化范围为19～29种,密度的变化范围为2288～300000ind·m^-3,生物量的变化范围为10.03～111.94mg·m^-3。

Community characteristics of zooplankton in Pearl River Estuary in summer of 2006

Based on the data collected from eight stations of Pearl River Estuary（August 2006）,the species composition and spatial distribution of zooplankton in Pearl River Estuary were determined.Results showed that 57 species in total were identified.Among them copepod was the dominant group,containing 20 taxa.The zooplankton community was composed of 18 rotatoria species,8 cladocera species and 2 tunicata species,and 1 specie in each of Protozan,polychaeta,heteropoda,medusae and euphausiacea,and 2 species unidentified.There were also some larva of copepod and macrura in different developmental stage.Brachionus calyciflorus,B.falcatus and Bosmina longirostris appeared in each station.Species numbers ranged from 19 to 29 among stations.The range of density variation was from 2 288 to 300 000 ind·m^-3.The range of biomass variation was from 10.03 to 111.94 mg·m^-3.