Community structure characteristics of macrobenthos in the western waters of Liaodong Bay in autumn

Macrobenthos was investigated at 14 stations in the western waters of Liaodong Bay in October 2009.In total,99 species were found,including 44 species of Polychaeta,13 species of Mollusca,39 species of Crustacea,and 3 species of other taxonomies.Polychaeta and Crustacea were accounted for 60% and 40% respectively in the top 10 IRI;the top three were Amphictene japonica,Hemileucon bidentatus and Harpiniopsis vadiculus.The average abundance of macrobenthos was 2387.1 ind./m2,and the average biomass was 11.16 g/m2in the sampling sites.The range of Shannon-Wiener index of macrobenthos in the investigated waters was 0.8881~4.626,with an average of 3.556.The range of corresponding Margalef’s richness index was 1.197~5.474,with an average of 3.426.The range of Pielou's evenness index was 0.213~0.9248,with an average of 0.7714.A total of five macrobenthic groups were split out from these stations at 40% similarity.According to the result of this investigation,the macrobenthic community structure was not disturbed.