渤海天津海域的网采浮游植物群落结构与赤潮植物的初步研究

2002年5月-2003年9月对渤海天津海域赤潮监控区进行了网采浮游植物的生态学调查，天津海域共发现浮游植物37属68种，其中硅藻为优势类群，共24属51种，占总种数的75．00％；甲藻7属11种；其他6属6种为少量的蓝藻、黄藻和金藻，其生态类型主要为温带近岸型。圆筛藻属的种类是该海域的全年优势类群，在群落总细胞数中的比例平均高达63．41%。浮游植物群落以大型细胞硅藻．甲藻占优群落为主，其平面分布与环境因子密切相关。

Preliminary Study on Net-phytoplankton Community Structure and Red Tide Causative Species in Tianjin Sea Area, Bohai Sea

Phytoplankton species composition, species succession and red tide causative species were analyzed from 2002-05 to 2003-09 in Tianjin red tide monitoring section, Bohai Sea. Total 68 taxa belong to 37 genus were recorded. The results showe that diatoms (51species, accounted for 75.00%) and dinoflagellates (11 species) are the major components of phytoplankton community in the survey region. The ecotype of these phytoplankters is temperate and neritic species. In Tianjin Sea area, Coscinodiscus species are abundant and dominant throughout the whole year, they contribute 63.41% of total bio-mass in cell number. The phytoplankton community is characterized by big cell diatom coexisting with dinoflagellates, its horizontal distribution is related to environmental factors. The species succession is the major process of seasonal changes of phytoplankton community development pathway in the Bohai Sea.