东北太平洋中国开辟区浮游植物的种类组成与分布

Species Composition and Distribution of Phytoplankton in the China Pioneer Area of the Northeast Pacific Ocean

根据东北太平洋中国开辟区西部(°～°,°～°′)和东部(°～151W155W8N1130N141W°,°～°)水域航次()和航次(～)所采的份网149W7N10N DY95-7 1997 -07 DY95-8 1998 - 07-09 36 采样品,鉴定网采浮游植物种,隶属于个门类属。其中主要的生态类群是大洋暖水类群(占总 180 5 47 种数)和广布性类群(占。该区主要优势种是太阳漂流藻( 83.8 % 14.5 % )Planktoniella sol、密聚角毛 )藻( Chaetoceros coarctatus、多瘤面角毛藻( ) C. bacteriastroides 、拟夜光梨甲藻() Pyrocystis pseudonoctilluca)和三叉角藻( Ceratium trichoceros)等。硅藻类和甲藻类等的平均细胞密度( 1 944～个4 101 /m3)和蓝藻类(主要是束毛藻 Trichodesmium)的藻丝体密度(～条 111486 /m3)都比较低。 本文分别讨论了调查区浮游植物的平面分布和垂直分布趋势及其与温跃层和浮游动物的相互关系。

Based on the 36 net samples from the eastern waters ( 141W149W7N°°～°°～°′10N ) and the western waters (151W155W, 8N1130N ) in the China Pioneer Area of the Northeast Pacific Ocean during the cruises DY95-7 (July 1997 ) and DY95-8 ( July to September 1998 ), 180 species belonging to 47 genera in 5 phyla of net phytoplankton have been identified. Of which, the main ecological groups are oceanic warm water group ( accounted for 83.8 % of total species ) and eurytopic group ( accounted for 14.5 % ). Dominant species in this area are Planktoniella sol, Chaetoceros coarctatus, C. bacteriastroides, Pyrocystis pseudonoctiluca and Ceratium trichoceros～, etc.. Both the averaged cell density (1 9444 104 cells/m3) of diatoms ～and dinoflagellates, etc. and the averaged filaments density (111486 strip/m3) of blue-green algae ( mainly Trichodesmium ) are relatively low. The horizontal and vertical distribution patterns of diatoms and dinoflagellates and the filaments density of phytoplankton in the studied area and their interrelations with thermocline and zooplankton are discussed, respectively.