The Summertime Ecological Study of the Macrobenthic Community in Intertidal Zone of Zhoushan Archipelago

To understand the present environment quality of the intertidal macrobenthos in Zhoushan archipelago,the macrobenthic community structure was studied based on data from 7 intertidal sections of Zhoushan archipelago in July 2009.The results showed that Mollusca,Crustacean and Polychaeta were the dominant groups in 103 species recorded.The average biomass was 96.19 g/m2,the average density was 223.1 ind/m2,and the Shannon-Weaver index was 2.14.According to cluster analysis,the macrobenthic community in Zhoushan archipelago can be divided into tow groups.The sediment envirment and tide were the most significant factors to affect community structure of intertidal macrobentic.The community of intertidal macrobenthoes in Shengsi section was unstressed;but the communites of intertidal macrobenthoes in the other sections were stressed moderately,and the community structures were terribly unstable.In conclusion,the community structure was simple,and both species number and Shannon-Weaver index were low,the environment quality of intertidal zone was not well in Zhoushan archipelago.