瓯江口海域大型底栖动物分布及其与环境的关系

对瓯江口及邻近海域大型底栖动物进行了春（2006年5月）、冬（2007年1月）两季的调查，分析了研究区大型底栖动物的季节分布及其与环境的关系.结果表明：共鉴定出大型底栖动物65种，多毛类和软体动物是该海域大型底栖动物的主要类群；春季，小头虫的优势度最高，冬季，红带织纹螺的优势度最高；研究区大型底栖动物的种类分布为河口区＜邻近海域、冬季＜春季；该区大型底栖动物两季平均生物量和栖息密度分别为19.66 g·m^-2和131 ind·m^-2，春、冬季的密度差异显著，但生物量差异不显著；春冬两季研究区大型底栖动物的Shannon-Weiner指数差异显著，Pielou均匀度指数、Margalef种类丰富度指数和Simpson优势度指数的差异不显著.春季，温度和浮游植物是影响研究区大型底栖动物类群的主要环境因子，冬季的主要影响因子为总有机碳和溶解氧.

Seasonal distribution of macrozoobenthos and its relations to environmental factors in Oujiang River estuary sea area

To evaluate the seasonal distribution of macrozoobenthos and its relations to environmental factors in Oujiang River estuary and adjacent waters, two cruise surveys were conducted in May 2006 (spring) and January 2007 (winter). A total of 65 species were collected, among which, polychaeta and mollusk were the dominant groups,  Capitella capitata and Nassarius succinctus were the dominant species in spring and winter, respectively. The species number of macrozoobenthos was more in adjacent sea area than in estuary, and more in spring than in winter. The average biomass and density in the two seasons were 1966 g·m-2 and 131 ind·m-2, respectively. There was a significant difference in the macrozoobenthos density between the two seasons, while less difference was observed in the biomass. The Shannon-Weiner index had significant difference between the two seasons, while Pielou eveness index, Margalef abundance index, and Simpsom dominance index had not. Water temperature and phytoplankton were the key factors affecting the macrozoobenthic taxa in spring, and water total organic carbon and dissolve oxygen were the key affecting factors in winter.