Seasonal Changes in Phytoplankton Biomass and Dominant Species in the Changjiang River Estuary and Adjacent Seas:General Trends Based on Field Survey Data 1959-2009

查看全文 作　　者：YANG [1,2]Shu;HAN [1]Xiurong;ZHANG [1]Chuansong;SUN [3]Baiye;WANG [1]Xiulin;SHI [1,4]Xiaoyong

机构地区：[1]Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China;[2]Yellow Sea Fisheries Research Institute,Chinese Fisheries Science Academy,Key Laboratory of Sustainable Development of Marine Fisheries,Ministry of Agriculture;[3]Agricultural Engineering College,Weifang Vocational College;[4]National Marine Hazard Mitigation Service,SOA

出　　处：《Journal of Ocean University of China》索引2014年第13卷第6期,共9页

基　　金：the National Basic Research Program of China (Nos. 2001 CB409703 and 2010CB428701);the National Natural Science Foundation of China (Nos. 41140037 and 41276 069) 摘　　要：The characteristics of seasonal variation in phytoplankton biomass and dominant species in the Changjiang River Estuary and adjacent seas were discussed based on field investigation data from 1959 to 2009. The field data from 1981 to 2004 showed that the Chlorophyll-a concentration in surface seawater was between 0.4 and 8.5 μg dm-3. The seasonal changes generally presented a bimodal trend, with the biomass peaks occurring in May and August, and Chlorophyll-a concentration was the lowest in winter. Seasonal biomass changes were mainly controlled by temperature and nutrient levels. From the end of autumn to the next early spring, phytoplankton biomass was mainly influenced by temperature, and in other seasons, nutrient level(including the nutrient supply from the terrestrial runoffs) was the major influence factor. Field investigation data from 1959 to 2009 demonstrated that diatoms were the main phytoplankton in this area, and Skeletonema costatum, Pseudo-nitzschia pungens, Coscinodiscus oculus-iridis, Thalassinoema nitzschioides, Paralia sulcata, Chaetoceros lorenzianus, Chaetoceros curvisetus, and Prorocentrum donghaiense Lu were common dominant species. The seasonal variations in major dominant phytoplankton species presented the following trends: 1) Skeletonema(mainly S. costatum) was dominant throughout the year; and 2) seasonal succession trends were Coscinodiscus(spring) →Chaetoceros(summer and autumn) → Coscinodiscus(winter). The annual dominance of S. costatum was attributed to its environmental eurytopicity and long standing time in surface waters. The seasonal succession of Coscinodiscus and Chaetoceros was associated with the seasonal variation in water stability and nutrient level in this area. On the other hand, long-term field data also indicated obvious interannual variation of phytoplankton biomass and community structure in the Changjiang River Estuary and adjacent seas: average annual phytoplankton biomass and dinoflagellate proportion both presented increased trends during the 1950 s-2000 s. 关键词：浮游植物生物量季节变化邻近海域调查数据优势种长江口中肋骨条藻叶绿素A浓度

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Seasonal Changes in Phytoplankton Biomass and Dominant Species in the Changjiang River Estuary and Adjacent Seas:General Trends Based on Field Survey Data 1959-2009

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