CAJ | 학술논문

轮虫是浮游动物群落的重要组成部分，在河流生态系统微食物网的物质传递和能量流动过程中扮演着重要角色，同时也是水质评价的重要指标之一．为研究广州河段轮虫的时空分布和水质特征，于2010年4月至2013年3月，对该河段中大码头（S1）和鱼珠码头（S2）站点轮虫群落结构进行每月1次的调查和理化指标的测定，并通过轮虫种类组成及QB/T指数对水质进行了生态学评价．3年调查期间，共记录轮虫48种，其中污染指示种34种．优势种多为耐污种类，主要为裂痕龟纹轮虫（Anuraeopsis fissa）、微型多突轮虫（Lififerotrocha subtilis）、角突臂尾轮虫（Brachionus angularis）、暗小异尾轮虫（Trichocerca pusilla）、西氏三肢轮虫（Filinia novaezealandiae）、尾突臂尾轮虫（Brachionus caudatus）．轮虫丰度变化为2～4063 ind．/L，中大码头轮虫丰度年平均值为（1359.46±189.54） ind．/L，鱼珠码头年平均值为（1058.61±156.16）ind．/L．调查发现，广州河段盐度很低，均在1.5以下．TN、TP处于较高水平，其中中大码头TN、TP平均值分别为（6.22±0.39）mg/L、（0.84±0.53）mg/L，鱼珠码头TN、TP平均值分别为（6.32±0.35）mg/L、（0.83±0.09）mg/L，两站点TN、TP质量浓度差异不显著．叶绿素a质量浓度的变化范围为7.68～215.33μg/L，中大码头和鱼珠码头年平均值分别为（56.25±45.31）μg/L、（49.77±7.14）μg/L．统计分析表明轮虫丰度（y）与叶绿素a质量浓度（x）呈正相关关系（P＜0.05；y＝629.750＋10.717x）．生态学评价和水质评价表明广州河段水质已呈重度富营养化趋势．
륜충시부유동물군락적중요조성부분，재하류생태계통미식물망적물질전체화능량류동과정중분연착중요각색，동시야시수질평개적중요지표지일．위연구엄주하단륜충적시공분포화수질특정，우2010년4월지2013년3월，대해하단중대마두（S1）화어주마두（S2）참점륜충군락결구진행매월1차적조사화이화지표적측정，병통과륜충충류조성급QB/T지수대수질진행료생태학평개．3년조사기간，공기록륜충48충，기중오염지시충34충．우세충다위내오충류，주요위렬흔구문륜충（Anuraeopsis fissa）、미형다돌륜충（Lififerotrocha subtilis）、각돌비미륜충（Brachionus angularis）、암소이미륜충（Trichocerca pusilla）、서씨삼지륜충（Filinia novaezealandiae）、미돌비미륜충（Brachionus caudatus）．륜충봉도변화위2～4063 ind．/L，중대마두륜충봉도년평균치위（1359.46±189.54） ind．/L，어주마두년평균치위（1058.61±156.16）ind．/L．조사발현，엄주하단염도흔저，균재1.5이하．TN、TP처우교고수평，기중중대마두TN、TP평균치분별위（6.22±0.39）mg/L、（0.84±0.53）mg/L，어주마두TN、TP평균치분별위（6.32±0.35）mg/L、（0.83±0.09）mg/L，량참점TN、TP질량농도차이불현저．협록소a질량농도적변화범위위7.68～215.33μg/L，중대마두화어주마두년평균치분별위（56.25±45.31）μg/L、（49.77±7.14）μg/L．통계분석표명륜충봉도（y）여협록소a질량농도（x）정정상관관계（P＜0.05；y＝629.750＋10.717x）．생태학평개화수질평개표명엄주하단수질이정중도부영양화추세．
Rotifers are an important part of the zooplankton community and key links to the microbial food web in river ecosystems.They can also be used as important indicators of water quality.Samples were collected monthly from April 201 0 to March 201 3 ,at the Zhongda (S1 )and Yuzhu (S2 )sites a-long the Guangzhou segment of the Pearl River in Guangzhou City.Rotifer species composition and abun-dance were analyzed and physico-chemical parameters of water samples were measured.A total of 48 spe-cies were identified,34 of which were pollution indicator species.The dominant species,including Anu-raeopsis fissa,Lififerotrocha subtilis,Brachionus angularis,Trichocerca pusilla,Filinia novaezealandia, and Brachionus caudatus,belong to pollution tolerant species.Rotifer abundance ranged from 2 to 4 063 ind./L,the annual mean densities were (1 359.46 ±1 89.54)ind./L (S1 )and (1 058.61 ±1 56.1 6) ind./L (S2 ),respectively.During the investigation period,salinity was less than 1.5 ,however,the contents of TN and TP were at high level at the two sampling stations.The annual mean TN contents were (6.22 ±0.39 )mg/L (S1 )and (6.32 ±0.35 )mg/L (S2 ),and the mean TP contents were (0.84 ± 0.53)mg/L (S1 )and (0.83 ±0.09)mg/L (S2),respectively.The contents of TN and TP were not significantly difference at the two sampling stations.The concentrations of chlorophyl-a range from 7.68 to 21 5.33 μg/L,the annual mean contents were (56.25 ±45.31 )μg/L (S1 )and (49.77 ±7.1 4 )μg/L (S2),respectively.Statistical analysis showed that there was a positive correlation between chloro-phyll-a concentrations (x)and rotifer abundance (y)(P<0.05;y=629.750 +1 0.71 7x).Based on ecological factors and water quality assessment system,the Guangzhou segment of the Pearl River is seri-ously eutrophic.