Effect of rich organic matter on Paraprionospio pinnata was analyzed according to the data of Macrobenthos and organic matter got on Futian tidal flat in Shenzhen Bay.The data from three sections A,D and E was got from January 1999 to October 2002.The results showed that there was markedly seasonal variation for P.pinnata on Futian tidal flat in Shenzhen Bay.The seasonal pattern was that the density and biomass of P.pinnata was high in March and April and low in September and October.The density of P.pinnata decreased along with the increase of organic matter content.The density and biomass of P.pinnata at three sections are A>D>E.The distribution of organic matter content is also A<D<E.There is negative correlation between density of P.pinnata and organic matter content.The higher organic matter is,the lower density and biomass of P.pinnata are.
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