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2007年1月～2月在南黄海23个站位的调查结果表明,小型底栖生物的平均丰度为34.88个/cm2,平均生物量为38.58μg/cm2(干重)。小型底栖生物的丰度和生物量的水平分布趋势大体相似,即高的数量值主要分布在45m等深线附近的站位,基本呈现“近岸低、中部高、远海低”的分布特征。共鉴定出15个小型底栖生物类群,自由生活海洋线虫是数量占优势的类群,平均丰度为27.19个/cm2,占总丰度的77.6%;其他较为重要的类群是,底栖桡足类13.3%,多毛类2.6%,动吻类2.5%,双壳类1.2%,甲壳幼1.1%,介形类0.4%,其他合计1.3%。按生物量,优势类群依次为多毛类(占32.9%)、线虫(27.7%)和桡足类(22.1%)。垂直分布上,平均70.8%的小型底栖动物分布于沉积物的表层0～2cm,冬季在调查海域东部深水区,90%以上的小型底栖生物集中于表层。
The survey results of 23 stations in the South Yellow Sea from January to February 2007 showed that the average abundance of meiobenthos was 34.88 / cm2 and the average biomass was 38.58μg / cm2 (dry weight). The distribution of abundance and biomass of meiobenthos are generally similar, that is, the high values are mainly distributed near the 45m isobath, basically showing “low nearshore, high in the middle and low in the sea” Distribution characteristics. A total of 15 benthic macrobenthos were identified, while the free-living marine nematodes were the dominant species with an average abundance of 27.19 per cm2, accounting for 77.6% of the total abundance. Other more important groups were benthic copepods 13.3% of the species, 2.6% of the polychaete, 2.5% of the kindey, 1.2% of the bivalve, 1.1% of the crustacean, 0.4% of the tocolysis and 1.3% of the others. According to the biomass, the dominant groups were polychaete (32.9%), nematode (27.7%) and copepod (22.1%). Vertical distribution, an average of 70.8% of the benthic animals distributed in the sediment surface 0 ~ 2cm, winter in the eastern deep-water survey area, more than 90% of the small benthic organisms concentrated in the surface.