辽东湾六股河口邻近海域冬季大型底栖动物生态学特征

Ecological Characteristics of the Macrobenthos in the Liugu River Estuary of Liaodong Bay in Winter

2009-12对辽东湾西部海域进行5条断面15个站位的大型底栖动物调查。共鉴定出大型底栖动物69种,其中纽形动物1种,多毛类31种,软体动物11种,甲壳类25种,棘皮动物1种。优势种有长尾亮钩虾(Photis longicaudata)、日本浪漂水虱(Cirolana japonensis)和长吻沙蚕(Glycera chirori)等。调查海域大型底栖动物平均丰度为955个/m^2,平均生物量为14.0g/m^2。丰度和生物量分布整体呈现离河口越远越高的趋势。在25%相似度尺度上,该海域大型底栖动物可划分为4个群落,各群落受到不同程度扰动。检验得出,底层水环境因子不足以影响大型底栖动物群落结构。

Macrobenthos at 15 stations of 5 sections in the western waters of Liaodong Bay was investigated in December 2009. A total of 69 species were identified, including 1 species of Nemertinea, 31 species of Polychaeta, 11 species of Mollusca, 25 species of Crustacea and 1 species of Echinodermata. The top 3 IRI species were Photis longicaudata, Cirolana japonensis and Glycera chirori. The average abundance and biomass were 955 ind./m2 and 14.0 g/m2 respectively, and the overall distribution of the abundance and biomass presented a trend that the number is higher the distance is further away from the estuary. 4 mac- robenthic community groups could be identified at the 25% similarity levels, and each groups were suffer- ing different degree of disturbance. The result suggested that the bottom environmental parameters were not strong enough to affect the structure of macrobenthic communities.