Distribution Pattern of Photosynthetic Picoplankton and Heterotrophic Bacteria in the Northern South China Sea  

作　　者：Yu-Ming Cai Xiu-Ren Ning Cheng-Gang Liu Qiang Hao 

机构地区：[1]Ocean University of China, Qingdao 266003, China [2]State Oceanic Administration Key Laboratories of Marine Ecosystem and Biogeochemistry, Hangzhou 310012, China [3]Second Institute of Oceanography, SOA, Hangzhou 310012, China

出　　处：《Journal of Integrative Plant Biology》2007年第3期282-298,共17页植物学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （90211021, 40506032）.Acknowledgements The authors sincerely thank Dr WKW Li （Biological 0ceanography Section, Bedford Institute of 0ceanography, Department of Fisheries and 0ceans, Dartmouth, Nova Scotia, Canada） for helpful advice on the paper and for sharing hydrological and chemical data from synchronous observations by Xiamen University and the South China Sea Branch, S0A. The authors also thank Dr Xin Peng in our team for help with sample preservation.

摘　　要：The environmental regulation of plcoplankton distribution in the northern South China Sea was examined In winter and summer of 2004. The average abundance of Synechococcus, Prochlorococcus, and heterotrophlc bacteria was lower In winter （30, 21, and 780×10^3 cells/cm^3, respectively） than In summer （53, 85, and 1 090×10^3 cells/cm^3, respectively）, but the seasonal pattern was opposite for plcoeukaryotlc phytoplankton （4 500 and 3 200 cells/cm^3 In winter and summer, respectively）. Synechococcus, picoeukaryotes, and bacteria were most abundant in the nutrient-rich coastal zone and continental shelf, but Prochlorococcus was most abundant In the continental slope and open ocean. The vertical distribution of each photosynthetic group and heterotrophlc bacteria changed between the two seasons. Synechococcus populations with apparently different phycoerythrobilin content occurred at many stations In the summer. In addition, two different populations of Prochlorococcus were found： （i） small, weakly fluorescing cells in the surface layer; and （ii） larger, strongly fluorescent cells In the deep layer. The distribution pattern of photosynthetic plcoplankton and heterotrophlc bacteria depends on environmental effects and their ecophyslologlcal differences. The distribution of Synechococcus appeared to be related to nutrient availability, whereas the distribution of Prochlorococcus appeared to be limited by temperature. Synechococcus was the only plcophytoplankton with a consistent strong relationship with bacteria.The environmental regulation of plcoplankton distribution in the northern South China Sea was examined In winter and summer of 2004. The average abundance of Synechococcus, Prochlorococcus, and heterotrophlc bacteria was lower In winter （30, 21, and 780×10^3 cells/cm^3, respectively） than In summer （53, 85, and 1 090×10^3 cells/cm^3, respectively）, but the seasonal pattern was opposite for plcoeukaryotlc phytoplankton （4 500 and 3 200 cells/cm^3 In winter and summer, respectively）. Synechococcus, picoeukaryotes, and bacteria were most abundant in the nutrient-rich coastal zone and continental shelf, but Prochlorococcus was most abundant In the continental slope and open ocean. The vertical distribution of each photosynthetic group and heterotrophlc bacteria changed between the two seasons. Synechococcus populations with apparently different phycoerythrobilin content occurred at many stations In the summer. In addition, two different populations of Prochlorococcus were found： （i） small, weakly fluorescing cells in the surface layer; and （ii） larger, strongly fluorescent cells In the deep layer. The distribution pattern of photosynthetic plcoplankton and heterotrophlc bacteria depends on environmental effects and their ecophyslologlcal differences. The distribution of Synechococcus appeared to be related to nutrient availability, whereas the distribution of Prochlorococcus appeared to be limited by temperature. Synechococcus was the only plcophytoplankton with a consistent strong relationship with bacteria.

关 键 词：diel variation heterotrophic bacteria photosynthetic picoeukaryotes PROCHLOROCOCCUS South China Sea spatial distribution structure standing stock SYNECHOCOCCUS 

分 类 号：Q178.53[生物学—水生生物学] Q949.2[生物学—普通生物学]