Studies on Benthos in the Intertidal Zone of Sanddy Mud Flats at Sanmen Bay, the East China Sea

This paper first reported species composition and distribution of biomass, habitat density and characteristics of community structure of benthos. The result has showed that 64 species is first recorded from intertidal zone at Sanmen, of which, most are eurythermal and eurychoric species, and the predominant species are Bluecoat exert, Morale iridescent,Cerithidea cingulata, Lunatia gilva, Laternula marilina and Gaetice depressus etc. .The range of benthic biomass is from 234.25g/m2 to 440g/m2; and habitat density is from 955.0 ind./m2 to 2950.0 ind./m2. The vertical distribution has shown that species, biomass and habitat density sequence on the intertidal zone are middle tide region > low tide region > high tide region.