Monthly change of community structure of zoobenthos in Xiangxi Bay after impoundment of the Three Gorges Reservoir,China  

作　　者：SHAO Meiling XIE Zhicai YE Lin CAI Qinghua 

机构地区：[1]Institute of Hydrobiology,The Chinese Academy of Sciences,State Key Laboratory of Freshwater Ecology and Biotechnology,Wuhan 430072,China [2]Graduate School of the Chinese Academy of Sciences,Beijing 100039,China

出　　处：《Frontiers in Biology》2007年第2期229-234,共6页生物学前沿（英文版）

基　　金：The project was supported by the Key Project of Knowledge Innovation Program of CAS(No.KSCX2-SW-111);the Key Project of National Natural Sciences Foundation of China(No.30330140);the National Basic Research Priorities Programme(973 Programme)(No.2002CB412300).

摘　　要：Xiangxi Bay,a typical bay of the Three Gorges Reservoir(TGR)in China,was formed in June 2003 after the impoundment of the TGR.We investigated the community structure of zoobenthos in Xiangxi Bay from August 2003 to August 2004.Benthic abundance and biomass were calculated per unit area of sediment.A total of 26 taxa were identified.They included two families of Lamellibranchia(7.7%of the total taxa number),two families of Oligochaeta(50%),Chironomidae(38.5%),and one other animal(3.8%).The average density and biomass were 276 ind./m2 and 0.301 g/m2,respectively.Oligochaetes and chironomids constituted the major groups,and Limnodrilus hoffmeisteri,Procladius sp.,Branchiura sowerbyi,Tubificidae sp1.and Polypedilum scalaenum group sp.were the common taxa in this reservoir system.Among them,L.hoffmeisteri and Procladius sp.were the dominant species,and contributed 37.0%and 28.3%of the total density,respectively.The standing crop of zoobenthos in Xiangxi Bay was relative low,compared with other similar reservoirs.Our studies demonstrate that the standing crop increased gradually with time.The total density and biomass in August 2004 were 8.8 and 14.3 times those of the initial impoundment,separately.Oligochaetes did not become the sole dominant group,indicating that the sediment loading in Xiangxi Bay may be not serious.

关 键 词：Three Gorges Reservoir(TGR) initial impoundment Xiangxi Bay ZOOBENTHOS density BIOMASS 

分 类 号：G63[文化科学—教育学]