Analysis of community structure on macrobenthos in sea area around Daya Bay nuclear power station

In Mar.and Jul.2005,the investigation of macrobenthos in the sea area of Da Ya Bay Nuclear power station was carried out.The sea area is in Dapeng'ao of Daya Bay.In 2 investigations,75 species of macrobenthos were collected altogether.Annelida is the most species.61 species of macrobenthos were collected altogether in spring.39 species of macrobenthos were collected altogether in summer.The average biomass and abundance was 42.13 g/m2 and 128.50 ind/m2,respectively,in 2 investigations.The average biomass and abundance was 52.55 g/m2 and 138.50 ind/m2 in spring respectively.The average biomass and abundance was 31.72 g/m2 and 118.50 ind/m2 respectively in summer.It is very different about macrobenthic quantity in different season.The cluster analysis and multi-dimentional scaling(MDS) analysis showed that the macrobenthic communities can be both divided into three groups in spring and summer,and one community can be disturbed in spring and summer.It is bigger about species quantity,biomass and abundance in spring than in summer.The bio-diversity is better in spring than in summer.The macrobenthic community has some changes in different season