Variations of Summer Phytoplankton Community Related to Environmental Factors in a Macro-Tidal Estuarine Embayment, Hangzhou Bay, China  

作　　者：ZHANG Yuexia YU Jun JIANG Zhibing WANG Qin WANG Hui 

机构地区：[1]College of Environmental Science and Engineering,Ocean University of China [2]Marine Monitoring and Forecasting Center of Zhejiang [3]Key Laboratory of Marine Ecosystem and Biogeochemistry,Second Institute of Oceanography,State Oceanic Administration [4]National Marine Environmental Forecasting Center

出　　处：《Journal of Ocean University of China》2015年第6期1025-1033,共9页中国海洋大学学报（英文版）

基　　金：provided by the Marine Monitoring and Forecasting Center of Zhejiang;funded by the National Basic Research Program of China(2010CB428903);the National Marine Public Welfare Research Project of China(201305009 and 201305043-3);the National Natural Science Foundation of China(41206103);Basic Scientific Research of Second Institute of Oceanography,SOA(JG1222)

摘　　要：To explore the distribution and composition of phytoplankton community and their responses to environmental changes, summer net-collected phytoplankton and physicochemical parameters in the Hangzhou Bay during 2004–2010 were investigated. A total of four phyla and 84 species were identified, including 67 diatom and 12 dinoflagellate species. The dominant species con- stantly consisted of the diatoms, although the dominance of dinoflagellate and cyanobacteria increased recently. Due to great spa- tio-temporal variations in environmental factors(salinity, suspended solids, and nutrient concentration), significant heterogeneities in community compositions among different years and subregions(inner and middle sections, and bay mouth) were found based on the analyses of multidimensional scaling and similarity. Canonical correspondence analysis showed that salinity and Si/N were the main variables associated with algal assemblage. Compared with the historical data since the 1980 s, eutrophication(N, P, and N/P increased with decreasing Si/N) was exacerbated drastically. Moreover, climatic forcing and human activities resulted in a series of physical alterations, including sediment retention, temperature increase, and salinity decrease as well as reduction in water exchanges. All these changes induced obvious increases in cell density and Chl-a while decreases in species diversity and diatom-dinoflagellate ratio as well as the shifting of dominant species. Therefore, the long-term phytoplankton variations were closely related to anthropogenic and climatic perturbations in the Hangzhou Bay.To explore the distribution and composition of phytoplankton community and their responses to environmental changes, summer net-collected phytoplankton and physicochemical parameters in the Hangzhou Bay during 2004-2010 were investigated. A total of four phyla and 84 species were identified, including 67 diatom and 12 dinoflagellate species. The dominant species constantly consisted of the diatoms, although the dominance of dinoflagellate and cyanobacteria increased recently. Due to great spatio-temporal variations in environmental factors (salinity, suspended solids, and nutrient concentration), significant heterogeneities in community compositions among different years and subregions (inner and middle sections, and bay mouth) were found based on the analyses of multidimensional scaling and similarity. Canonical correspondence analysis showed that salinity and Si/N were the main variables associated with algal assemblage. Compared with the historical data since the 1980s, eutrophication (N, P, and N/P increased with decreasing Si/N) was exacerbated drastically. Moreover, climatic forcing and human activities resulted in a series of physical alterations, including sediment retention, temperature increase, and salinity decrease as well as reduction in water exchanges. All these changes induced obvious increases in cell density and Chl-a while decreases in species diversity and diatom-dinoflagellate ratio as well as the shifting of dominant species. Therefore, the long-term phytoplankton variations were closely related to anthropogenic and climatic perturbations in the Hangzhou Bay.

关 键 词：Hangzhou Bay PHYTOPLANKTON long-term changes EUTROPHICATION Qiantang River CHANGJIANG 

分 类 号：S917.3[农业科学—水产科学]