Community structure of the intertidal macrobenthic fauna in major and small Changtu island,Zhejiang

The community structure of the intertidal macrobenthic fauna in major and small Changtu island of Zhoushan, Zhejiang, such as species composition, quantity distribution and diversity index, was studied in this paper. The results indicated that there were 34 species, including 1 species of Coelenterata, 2 species of Chordata, 10 species of Arthropoda and 21 species of Mollusca. The average biomass and density in all stations were 842.68 g·m–2 and 1186 ind·m–2, respectively. The mollusca were the first in biomass and density among all macrobenthic fauna. The values of Shannon-Wiener index, Margalef's species richness index and Pielou's evenness index were 1.176-2.115, 0.833-1.897 and 0.565-0.801; their averages were 1.405±0.414, 1.208±0.663 and 0.678±0.191, respectively. The secondary productivity of the intertidal marcobenthic fauna was 108.98 g·m-2 based on Bery empirical equation.