Canonical Correspondence Analysis of Spring Macrobenthos Community and Its Environment in Changjiang Estuary and Adjacent Sea

The macrobenthic community and environmental quality were investigated based on data from 21 stations in Changjiang Estuary and adjacent sea in April 2009. Canonical correspondence analysis( CCA) was applied to explore the relationship between macrobenthos species and environmental parameters. The results showed that 56 species were identified; Polychaeta was the dominant group. The total average biomass was 11. 26 g / m2,the total average abundance was 237. 4 ind/m2. The abundance and biomass were higher in offshore stations than nearshore ones. Based on CCA,depth,salinity,primary productivity,organic pollution and heavy metal pollution were the main factors affecting the macrobentic community in Changjiang Estuary and adjacent sea. The distribution of macrobenthos showed the obvious avoiding trend to organic pollution and heavy metal pollution. In conclusion,the impact of organic pollution and heavy metal pollution on macrobenthos community was observable. Capitella sp., Glycinde gurjanovoae,Magelona sp. and Cirratulidae sp. showed the obvious tolerance to organic pollution and heavy metal pollution.