南黄海小型底栖动物分布及其与环境因子的关系

本文利用2004年1月在南黄海28个站位所采集的沉积物样品，对小型底栖动物的丰度和生物量及其与环境因子的关系进行了研究。结果表明，共鉴定出自由生活线虫、底栖桡足类、多毛类、动吻类、双壳类、介形类等20个小型底栖动物类群，小型底栖动物的平均丰度和平均生物量分别为(1186.12 ±486.07) ind/10cm2和(1120.72 ±487.21) μg/10cm2，其中海洋线虫占绝对优势，其平均丰度为(1063.97 ±469.98) ind/10cm2，占小型动物总丰度的89.702%；其次是底栖桡足类，占4.193%。小型底栖动物的水平分布呈镶嵌式分布，沿岸站位小型底栖动物的丰度和生物量较高；垂直分布上，小型底栖动物分布于沉积物0-2、2-5cm和5-8cm的数量比例分别为74.33%、22.31%和3.36%。与环境因子相关分析表明，Chl-a的含量是影响小型底栖生物分布的主要因子。

Relationship Between Distribution of Meiofauna and Environmental Factors in Southern Yellow Sea

The abundance and biomass of meiofauna were quantitatively studied at a grid of 28 stations during the cruise of investigation in the Southern Yellow Sea, China in January 2004. The main results are as follows: A total of 20 groups of meiofauna in the Southern Yellow Sea were identified, they were Nematoda, Copepoda, Polychaeta, Kinorhyncha, Bivalvia, Ostracoda et al.. The mean abundance and biomass of meiofauna are (1186.12 ±486.07) ind/10cm2 and (1120.72 ±487.21) μg/10cm2, respectively. 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%. In terms of horizontal distribution, stations near the coast have higher abundance and biomss of meiofauna. In terms of vertical distribution, 74.33% of total meibenthos is found in the surface sediment 0-2cm, 22.31% in 2-5cm and 3.36% in 5-8cm sediment. Correlation analyses between abundance and biomass of meiofauna and environmental factors show that Chl-a is the key factor that affects the distribution of meiofauna.