Seasonal variations of phytoplankton phosphorus stress in the Yellow Sea Cold Water Mass

• Published in: Acta oceanologica Sinica 2014-10, Vol.33 (10), p.124-135
• Main Authors: Wang, Dan, Huang, Bangqin, Liu, Xin, Liu, Guimei, Wang, Hui
• Format: Article
• Language: English
• Subjects: Alexandrium; Alkaline phosphatase; Bacillariophyceae; Climatology; Cold; Cold water; Cold water masses; Cruises; Diatoms; Dinoflagellata; Dinoflagellates; Dominant species; Earth and Environmental Science; Earth Sciences; Ecology; Ecophysiology; Engineering Fluid Dynamics; Environmental Chemistry; Enzymes; Marine; Marine & Freshwater Sciences; Marine microorganisms; Microorganisms; Nutrient availability; Oceanography; Paralia sulcata; Phosphatase; Phosphorus; Phytoplankton; Plankton; R&D; Research & development; Scrippsiella; Seasonal variation; Seasonal variations; Vertical profiles; Water masses; Water temperature; 低磷胁迫; 养分有效性; 季节变化特征; 季节性变化; 浮游植物群落; 生理生态响应; 碱性磷酸酶活性; 黄海冷水团
• ISSN: 0253-505X; 1869-1099
• DOI: 10.1007/s13131-014-0547-x

The Yellow Sea is located between the China Mainland and the Korean Peninsula, representing a typical shallow epicontinental sea. The Yellow Sea Cold Water Mass（YSCWM） is one of the most important physical features in the Yellow Sea. The characteristics of vertical profiles and seasonal variations of biogenic elements in the YSCWM may lead the variations of nutrient availability（e.g., phosphorus） and phosphorus stress of phytoplankton. In this study, the authors surveyed the seasonal variations of phytoplankton phosphorus stress with emphasis on the effect of the YSCWM during the four cruises in April and October 2006, March and August 2007. Using both bulk and single-cell alkaline phosphatase activity（APA） assays, this study evaluated phosphorus status of phytoplankton community, succession of phytoplankton community and ecophysiological responses of phytoplankton to phosphorus in the typical region of the YSCWM. With the occurrence of the YSCWM, especially the variations of concentration of dissolved inorganic phosphorus（DIP）, the results of bulk APA appeared corresponding seasonal variations. Along Transects A and B, the mean APA in August was the highest, and that in March was the lowest. According to the ELF-labeled assay＇s results, seasonal variations of the ELF-labeled percentages within dominant species indicated that diatoms were dominant in March, April and October, while dinoflagellates were dominant in August. During the four cruises, the ELF-labeled percentages of diatoms except Paralia sulcata showed that diatoms were not phosphorus deficient in April 2006 at all, but suffered from severe phosphorus stress in August 2007. In comparison, the ELF-labeled percentages of dinoflagellates were all above 50% during the four time series, which meant dinoflagellates such as Alexandrium and Scrippsiella, sustained perennial phosphorus stress.