| The sedimental environment, abundance and biomass of meiofauna, community structure and biodiversity and systematics of free living marine nematodes, were quantitatively studied at a grid of 28 stations during the cruise of investigation in the Southern Yellow Sea, China in January 2004 and also at B2 station sampling bimonthly from September 2003 to September 2004 in Jiaozhou Bay. Meanwhile, ATP content of the phytal meiofauna from the rocky intertidal zone in Qingdao was studied. The main results are as follows:The sediment types of the sampling stations mainly belong to silt-clay (TY) and sand-silt-clay (STY) in the Southern Yellow Sea. Sediment characteristic parameters have significant correlations with each other. The average content of chlorophyll a (Chl-a) in 0-2, 2-5cm and 5-8cm sediment are 0.683±0.4,0.42±0.234 and 0.234±0.09 mg·kg-1 sediment, respectively. The average content of phaeophorbide a (Pha-a) in 0-2, 2-5cm and 5-8cm sediment are 2.09±1.14,1.25±0.667和0.837±0.51 mg·kg-1 sediment, respectively. In terms of horizontal distribution, there are two higher peak values of Chl-a and Pha-a in southern part and northern part of the Southern Yellow Sea, respectively. The average content of organic matter is 1.236%±0.435%. Correlation analysis shows that sediment characteristic parameters are the main factors which affect the pigments content and organic matter content. A total of 20 groups of meiofauna in the Southern Yellow Sea: Nematoda, Copepoda, Polychaeta, Kinorhyncha, Bivalvia, Ostracoda, Amphipoda, Tanaidacea, Isopoda, Cumacea, Gastropoda, Gastrotricha, Halacaroidea, nectochaeta, Amphiura, Nemertina, Insecta, Priapulida, Turbellaria and others were identified. Free living marine nematodes are the most dominant group, accounting for 89.702% of the abundance of meiofauna, with benthic harpacticoid copepods in the second, accounting for 4.193%. The mean abundance, biomass and production of meiofauna are (1186.12±486.07) ind.10cm-2, (1120.72±487.21)μg dwt 10cm-2 and (10086.49...
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