浙闽沿岸流消退时期的浮游植物群落结构特征

Community structure of phytoplankton during the fading period of Zhemin coastal water in Taiwan Strait

浙闽沿岸流对台湾海峡的水文环境意义重大。依据国家海洋局"908"补充调查专项,通过对覆盖浙闽沿岸流海洋锋面过程的海洋生物调查研究,于2008年4月实施针对浙闽沿岸流消退时期(春季)台湾海峡锋面海域的浮游植物取样分析。结果共记录3门41属86种,其中硅藻35属76种,甲藻5属9种,蓝藻1属1种。种类组成以暖水性种类和广布性种类为主,分别占总种类的50.29%和34.17%。主要优势种为琼氏圆筛藻(Coscinodiscus jonesianus)、辐射圆筛藻(Coscinodiscus radiatus)、密联角毛藻(Chaetoceros densus)、三角角藻(Ceratium tripos)。浮游植物丰度平均为137.89×104 cells/m3,与盐度存在极显著正相关关系,暖水高盐性种类有高丰度。丰度的平面分布呈现从近岸往外海、从北部向南部递增的态势。浮游植物物种多样性较为丰富,种间比例较为均匀。浮游植物群落结构反映了浙闽沿岸流与南海水的消长动态。

Zhemin Coastal Water plays an important role in marine dynamics of Taiwan Strait.According to a complemental investigation of ＂908＂ from State Oceanic Administrration,halobios were conducted in Taiwan Strait Front of Zhemin Coastal Water in April,2009.The community structure,the abundance,the composition and distribution of phytoplankton were analysed based on investigation data.The results showed 86 species belonging to 41 genera were identified,including diatoms of 76 species in 35 genera,pyrrophyta of 9 species in 5 genera,cyanobacteria of 1 species in 1 genera.Warm water species were accounting for 50.29% while eurythermy species were accounting for 34.17%.The main dominant species included Coscinodiscus jonesianus,Coscinodiscus radiatus,Chaetoceros densus and Ceratium tripos.The average of phytoplankton abundance was 137.89×104 cells/m3,which had significantly positive correlation with salinity.Abundance distribution of phytoplankton was higher in the southern waters,lower in the northern waters.Species’ diversity was rich and evenness was normal.Community structure of phytoplankton indicated marine dynamics between Zhemin Coastal Water and South China Sea Water.