水生态学杂志Issue(4)：69-77,9.DOI:10.15928/j.1674-3075.2015.04.010
淀山湖浮游动物群落结构特征及其影响因子
Community Structure of Zooplankton and Influencing Factors in Dianshan Lake of Shanghai
摘要
Abstract
Dianshan Lake,located in the Taihu Lake basin at the border of Jiangsu Province and Shanghai City,is the largest natural freshwater lake in Shanghai.It is an important source of drinking water and is within the eco-conservation district of upstream Huangpu River.Over the past 10 years,with the rapid development of the regional economy,the waters of Dianshan Lake became eutrophic.Shanghai municipality took measures for bioremediation and endogenous pollution control to prevent algae blooms and eutrophication of Dianshan Lake has gradually im-proved.The ecosystem is recovering according to water monitoring data for Dianshan Lake from 2008 -2010.To better understand the zooplankton community in Dianshan Lake after ecological restoration,an investigation was conducted from March to December of 2013.Species composition and density,dominant species and biodiversity of rotifers and planktonic crustaceans were measured.After obtaining the data,the relationship of the zooplankton community structure was correlated with environmental factors including phytoplankton and water quality.The sam-ples were taken in March,June,September and December of 2013 at 12 sampling sites (S1 -S12):S1 -S3 loca-ted in the downstream section of Dianshan Lake;S6,S8 -S10 in the upstream section;S7 and S11 located in the open water zone;S4,S5 and S12 located near the east or west bank of the lake where the influence of inflow water was mild.Zooplankton samples for qualitative analysis were collected at 0.5 under the surface with No.25 plankton net,and fixed with 4% formalin.10 L water samples for quantitative analysis of copepods and cladocera were col-lected at 0.5 m with a No.25 net into a glass water sampler,and fixed with 4% formalin after concentration to 5 L.For quantitative analysis of rotifers,1 L water sample were collected at 0.5 m and,after shaking well,fixed with 4% formalin and Lugol′s solution and then concentrated to 50 mL by settling 24 h.All samples were taken to the laboratory for species identification,counting and weighing.Phytoplankton sampling and measurement of physi-cochemical parameters (water temperature,pH,dissolved oxygen,chemical oxygen demand,nitrate nitrogen,ni-trite nitrogen)were carried out simultaneously.A total of 60 zooplankton species were identified:31 species of roti-fer (51.7%),19 species of cladocera (31.7%),and 10 species of copepod (16.7%).The dominant species were Brachionus calyciflorus,B.schizocerca,Keratella quadrala,Asplanchna priodonta,Mesocyclops leuckarti, Schmackeria forbesi,Bosmina coregoni,B.longirostris,and Diaphanosoma brachyurum.From March to June,and from September and December,the dominant species varied significantly.The mean density and biomass of zoo-plankton were 78.10 ind /L and 2.06 mg/L,with the highest density occurring in September.Total zooplankton density was determined by rotifers in March and December and by cladocera in June and September.Generally,the values of Shannon-Wiener indices (H′),species richness indices (d)and Pielou evenness indices (J′)were high-er in September and December than in March and June,and higher upstream than downstream.Correlation analysis indicates a significant association between the zooplankton community and environmental factors such as phytoplank-ton species,density of pyrrophyta,density of euglenophyta,density of cryptophyta,water temperature,nitrite ni-trogen,nitrate nitrogen,permanganate index and chemical oxygen demand.Based on analysis of the biological di-versity index and indicator organisms,the water quality of Dianshan Lake can be regarded as βmesosaprobity (moderately polluted)with an improving trend.关键词
浮游动物/群落结构/环境因子/淀山湖Key words
zooplankton/community structure/environmental factor/Dianshan Lake分类
生物科学引用本文复制引用
李强,田华,姜民,蔡文婕,曹玥..淀山湖浮游动物群落结构特征及其影响因子[J].水生态学杂志,2015,(4):69-77,9.基金项目
上海市科委科技攻关项目（08DZl203100）。 （）
