辽东湾西部倾废区临近海域大型底栖动物群落结构

2012年9月对辽东湾西部倾倒区海域的大型底栖动物进行了调查。调查海域共发现底栖动物54种,包括多毛类35种,甲壳类10种,软体动物6种,棘皮动物1种,其他2种。底栖动物丰度平均为1 140.8个/m2,生物量为11.02 g/m2,多样性指数平均为3.39。丰度、生物量比较结果显示,调查海域大型底栖动物群落受到中度干扰,调查海域底栖动物群落可分为以对照组为主的群落和倾倒区群落。海洋倾倒导致倾倒区内大型底栖动物的种类数量、丰度、生物量和多样性水平下降,群落特征种受倾倒的影响较明显。底栖动物与重金属含量之间无显著相关关系,掩埋是辽东湾西部倾倒活动主要的影响方式。

Macrobenthos community in the western Liaodong Bay ocean with dumping ground

Macrobenthos in the western waters of Liaodong Bay with dumping ground was investigated in September 2012. Totally 53 species were identified in the research region, including 35 species of Polychaeta, 10 species of Crustacea, 6 species of Mollusca, 1 specie of Echi nodermata, and 2 species of other taxonomical. The average abundance of macrobenthos was 1140.8 ind./m², and average biomass was 11.02 g/m². The average biodiversity index of macrobenthos was 3.39. The Abundance/biomass comparison reveals that the macrobenthos community had moderate interference in the research region. The macrobenthos community can be divided into two groups: control group and dumping ground group. The ocean dumping had decreased species quantity, abundance, biomass and diversity level of mactobenthos. The ocean dumping changed the characteristic species in this area. There were no significant correlation between macrobenthos and the content of heavy metals. Covering was the main influence manner for ocean dumping in the western waters of Liaodong Bay.