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• W2392796575 abstract "The Baiyangdian lake is the biggest shallow freshwater lake in north China,which provides important ecosystem services.In recent years,due to reduced precipitation and sewage discharge from upstreams,the Baiyangdian ecosystem is experiencing a rapid decline and degradation,resulting in the lower species diversity,and ecosystem services are being lost.It is urgent task to protect the biological resources currently.In order to understand status of biological resources of the Baiyangdian lake,the community structures of rotifera and environmental characteristics at 8 stations of the Baiyangdian lake were investigated from september,2005 to December,2006.The results showed that sampling stations were subject to different degrees of pollution according to water quality index(PI and Pb/n).Three stations(Nanliuzhuang station,Wangjiazhuai station and Guangdian station) were in a very seriously polluted state,one station(Shaochedian station) was serious polluted,three stations(Quantou staion,Duancun station and Zaolinzhuang station) were moderately polluted,and only one station(Caiputai station) was lightly polluted.110 species of rotifera belonging to 38 genera,12 families and 2 orders were identified,in which there was the most species at Caiputai station acounting for 73.9% of total species,and then Zaolinzhuang station,Shaochedian station,Duancun station,Quantou station,and the least at Nanliuzhuang station acounting for 35.2% of total species.Comared to survey data in 1990,total species number was 13 less than that and 47 species were identified only in this survey.Rotifera displayed higher species number in Spring and Autumn than in Summer and Winter.The dominant species showed temporal and spatial changes.Filinia maior,Polyarthra trigla and the species of Brachionidae and Keratella that indicated α and β type of medium pollution distributed at Nanliuzhuang station,but the species of Monostyla,Lecana and Trichotria living in clean water distributed at Caiputai station,Zaolinzhuang station and Shaochedian station,which indicated the water quality in different stations.Except Duancun station,cell density and biomass of rotifera at other stations displayed the peak in April or May,another smaller peak appeared in September or October.According to Q(B/T) which are ratio of species number of Brachionus and Trichocerca,Nanliuzhuang station was eutrophic,Quantou station was Oligotrophic and the others were medium trophic.The Shannon-Weaver index and evenness index were higher in summer and autumn and lower in spring and winter.As the Baiyangdian lake was subject to frequent human activities in recent years,such as tourism,aquaculture,dredging and water diversion projects,the ecosystem was difficult to reach a steady state,the rotifer community structure was also constantly changing.Biodiversity index changed singnificantly in same station in different spampling time,which resuted in not indicating the water quality in the Baiyangdian lake completely.In conclusion,most of the water bodies of the Baiyangdian lake were in moderate pollution and severe pollution,rotifera community structure existed larger temporal and spatial heterogeneity." @default.
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• W2392796575 date "2010-01-01" @default.
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• W2392796575 title "Characteristics of rotifera community structure in the Baiyangdian Lake" @default.
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