Community Structure And Biodiversity Of Macrofauna In The Westhern Part Of Jiaozhou Bay

The ecological study of macrofauna was conducted on five represantive sampling stations sampled biomonthly from Sept,2003 to Sept,2004 in the westhern part of Jiaozhou Bay, including estuary of Dagu River, raft-cultural and nearby area in Hangdao. Abundance and biomass of macrofauna were investigated by quantitative study. The macrofauna community structure and biodiversity were analyzed through multivariate statistic analysis. The ABC method (abundance biomass comparison) was used to detect pollution-induced disturbance in marine benthic communities.Total of 191 species were identified. The total mean abundance, biomass were 2183.36 ind./m2,469.9 g.wwt/㎡ respectively. There was obvious difference between abundance and biomass of stations in the raft-cultural area and outside. Compared with the historic studies on macrofauna. it can be found that the macrofauna community in raft-cultural area was disturbed severely by the aquiculture ,and there were some changes seasonally in the population composition in aquiculture and nearby area, the quantity of Echinodermata decreased remarkably and there was a significant increase in mollusk in particular Ruditapes philippinarum. The macrobenthic community was composed of four big biology teams according to CLUSTER and MDS.There were some changes in the macrobenthic community structure of inside and outside raft-cultural area which were most likely attributed to increasing fishery activity and the water pollution pressure in the Jiao zhou Bay.The results show that biodiversity indexes were lower in stations D and S than that in other stations.there is significant difference between biodiversity indexes of stations...