Abstract: From November 2012 to October 2013, macrobenthic assemblages and biodiversities were investigated seasonally in different intertidal habitats of Maoyan Island in Taizhou, Zhejiang Province. The habitats included artificial Kandelia obovata mangrove forests with different ages, Spartina alterniflora marsh, and bare mudflat. A total of 48 species were recorded, belonging to 28 families, 9 classes, and 8 phyla. Arthropods, mollusks, and annelidas accounted for 83.3% of the total. The density characters of quantitative sampling were used to calculate Shannon index, Pielou index, Margalef index, Simpson index, and G-F diversity index. The results showed that the species and density in S. alterniflora habitat were lower than in K. obovata and natural tidal flat habitats. The numbers of species in summer and spring were higher than in autumn and winter. Either Shannon index or G-F index in mangrove forests was higher than in the other habitats. The species diversity in the young mangrove forest was lower than that in the 6 and 8-year-old mangrove forests, but family and genus diversities were higher in the young mangrove forest.  Variance analysis and hierarchical cluster showed that habitat and season were the key factors
affecting the distribution of macrobenthic communities.

Key words: PM₁₀, PM₂₅, meteorological factors, traffic flow