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20 0 0年 6月在南黄海鱼产卵场 18个站位的调查结果表明 ,小型底栖生物的平均丰度为 0 .81× 10 6ind· m-2 (± 0 .4 1× 10 6ind· m-2 ) ,平均生物量为 1.2 2 g dwt· m-2 ,小型底栖生物的丰度和生物量的水平分布图型大体相似 ,即高的数量值分布在等深线 5 0 m以浅的与海岸线平行的74 94、7994、85 94、11394等站。小型底栖生物数量与 10种环境因子的 Pearson相关分析表明 ,丰度与水深呈负相关 (r,- 0 .5 5 5 ,P<0 .0 5 ) ,与 Chl- a呈正相关 (r,0 .4 86 ,P<0 .0 5 ) ;生物量与水深、沉积物中的粘土含量 (% )和水含量 (% )均呈负相关 (r,0 .4 84～ 0 .5 0 0 ,P<0 .0 5 )。共鉴定出 18个小型生物类群 ,线虫是数量占优势的类群 ,平均丰度 0 .6 0× 10 6ind· m-2 (± 0 .36× 10 6ind· m-2 ) ,占总丰度的 73.8% ,其他的重要类群依次为底栖桡足类 (18.7% )、多毛类 (3.1% )、动吻类 (1.6 % )和介形类 (1.1% )。按生物量 ,优势类群依次为多毛类 (占 2 9% )、桡足类 (2 3% )和线虫 (2 0 % )
The survey of 18 stations in the spawning grounds of the southern Yellow Sea in June 20 0 showed that the average abundance of meiophores was 0.81 × 10 6 ind · m -2 (± 0.4 × 10 10) 6ind · m-2) with an average biomass of 1.2 2 g dwt · m-2. The abundance patterns and biomass distribution patterns of meiobenthos are generally similar, that is, the high values are distributed in isobaths m 74 94,7994,85 94,11394 and other stations with shallow parallel to the coastline. Pearson correlation analysis showed that there was a negative correlation between abundance and water depth (r, - 0.555, P <0.05) and a positive correlation with Chl-a (r, 0. 446, P <0. 05). Biomass had a negative correlation with water depth, clay content (%) and water content (%) in sediments , P <0. 05). A total of 18 small-sized biological groups were identified, and the nematodes were the dominant groups with an average abundance of 0.660 × 10 6 ind · m -2 (± 0.36 × 10 6 ind · m -2) 73.8%. Other important groups were benthic copepods (18.7%), polychaetes (3.1%), moving kisses (1.6%) and the prototypical class (1.1%). According to the biomass, the dominant groups were polychaete (29%), copepod (23%) and nematode (20%),