A dinoflagellate Cochlodinium geminatum bloom in the Zhujiang (Pearl) River estuary in autumn 2009  

作　　者：柯志新 黄良民 谭烨辉 宋星宇 

机构地区：[1]Key Laboratory of Marine Bio-resource Sustainable Utilization,South China Sea Institute of Oceanology,Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2012年第3期371-378,共8页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Nos.41006066, 41130855);the Knowledge Innovation Program of Chinese Academy of Sciences (No. SQ200907);the Science and Technology Program of Guangdong Province (No. 2009B030600004)

摘　　要：A severe Cochlodinium geminatum red tide (>300 km2) was observed in the Zhujiang (Pearl) River estuary, South China Sea in autumn 2009. We evaluated the environmental conditions and phytoplankton community structure during the outbreak. The red tide water mass had significantly higher dissolved inorganic phosphate (DIP), ammonia, and temperature, but significantly lower nitrite, nitrate, dissolved inorganic nitrogen (DIN), and DIN/DIP relative to the non-red-tide zones. The phytoplankton assemblage was dominated by dinoflagellates and diatoms during the red tide. C. geminatum was the most abundant species, with a peak density of 4.13×107 cell/L, accounting for >65% of the total phytoplankton density. The DIN/DIP ratio was the most important predictor of species, accounting for 12.45% of the total variation in the phytoplankton community. Heavy phosphorus loading, low precipitation, and severe saline intrusion were likely responsible for the bloom of C. geminatum.A severe Cochlodinium geminatum red tide （〉300 km2） was observed in the Zhujiang （Pearl） River estuary, South China Sea in autumn 2009. We evaluated the environmental conditions and phytoplankton community structure during the outbreak. The red tide water mass had significantly higher dissolved inorganic phosphate （DIP）, ammonia, and temperature, but significantly lower nitrite, nitrate, dissolved inorganic nitrogen （DIN）, and DIN/DIP relative to the non-red-tide zones. The phytoplankton assemblage was dominated by dinoflagellates and diatoms during the red tide. C. geminatum was the most abundant species, with a peak density of 4.13 × 107 cell/L, accounting for 〉65% of the total phytoplankton density. The DIN/DIP ratio was the most important predictor of species, accounting for 12.45% of the total variation in the phytoplankton community. Heavy phosphorus loading, low precipitation, and severe saline intrusion were likely responsible for the bloom of C. geminatum.

关 键 词：red tides NUTRIENTS phytoplankton composition EUTROPHICATION Zhujiang （Pearl） River estuary 

分 类 号：P736.22[天文地球—海洋地质]