【摘要】 于2005年5月(春季)和11月(秋季)对浙江省象山港海域底栖硅藻进行采样调查,分析底栖硅藻的种类组成、丰度、优势种、多样性及群落结构的季节变化和平面分布特征,并讨论底栖硅藻与水温、盐度等环境因子之间的关系。共鉴定硅藻46属179种,硅藻种类数在春季共有46属164种,秋季减少到22属52种。种类组成以广温种为主,其次是暖水种和温水种。主要优势种有柱状小环藻(Cyclotella stylorum)、琼氏圆筛藻(Coscinodiscus jonesianus)等。细胞丰度范围在(0.007~6.851)×103个/g之间,平均值为1.522×103个/g。春季硅藻丰度较高,平均值为2.974×103个/g,秋季为0.071×103个/g。不同站位间硅藻的分布也表现出显著的差异,硅藻细胞丰度最高值位于港顶部鱼排密集区9号站位,春季细胞丰度值为6.851×103个/g,秋季细胞丰度值为0.143×103个/g。硅藻丰度较高的有位于鱼排区的3号、4号、5号、7号站位,其余较低。硅藻群落多样性指数和均匀度春季较高,秋季降低。底栖硅藻数量分布随季节变化明显,与盐度关系不大。更多还原

【Abstract】 The samples for the presen t study were collected from the surface sediments in the Xiangshan Bay,Zhejiang Province in May 2005 and November 2005 and were observed under a light microscope. The species composition, abundance, community structure and diversity were investigated. A total of 179 taxa belonging to46 genera of diatom were identified. The result showed that the ecotypes of diatom were mostly eurytopic species,next were warm water species and temperate species. The most dominant species were Cyclotella stylorum and Coscinodiscus jonesianus. The seasonal variation of diatom abundance was remarkable. The cell abundance of diatoms was higher in spring(2.974×103cells/g) than autumn(0.071×103cells/g). The number of species varies with change of season, demonstrating the adaptability of diatoms to the temperature of water. The species diversity of benthic diatom was lower in autumn than spring.更多还原