Silica supply and diatom blooms in the Jiaozhou Bay, China

• Published in: Acta oceanologica Sinica Vol. 35; no. 10; pp. 20 - 27
• Main Authors: Shen, Zhiliang, Yao, Yun, Wu, Yulin
• Format: Journal Article
• Language: English
• Published: Beijing The Chinese Society of Oceanography 01.10.2016; Springer Nature B.V; Key Laboratory of Marine Ecology and Environmental Sciences, Institute of 0ceanology, Chinese Academy of Sciences, Qingdao 266071, China%Research Center for the Computer and Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
• Subjects: Bacillariophyceae; Blooms; Chlorophyll; Chlorophyll a; Climatology; Diatoms; Earth and Environmental Science; Earth Sciences; Ecological balance; Ecology; Engineering Fluid Dynamics; Environmental Chemistry; Eutrophication; Low level; Marine; Marine & Freshwater Sciences; Nutrient concentrations; Nutrient content; Nutrients; Oceanography; Phytoplankton; Plankton; Silica; Silicon; 中国; 供应; 叶绿素a含量; 水华; 浮游植物生物量; 硅藻; 胶州湾; 营养盐浓度; Jiaozhou Bay; INW, China, People's Rep., Shandong Prov., Jiaozhou Bay; China, People's Rep; blooms; phytoplankton; chlorophyll; nutrient; Jiaozhou Bay; Si supply; chlorophyll a
• ISSN: 0253-505X; 1869-1099
• DOI: 10.1007/s13131-016-0917-7

The variations in nutrients（molar ratios） and chlorophyll a in the Jiaozhou Bay were examined before and after a diatom bloom in a period that lasted from November 2003 to March 2004. Negative relationships between nutrient concentrations, Si/P, Si/N ratios and chlorophyll a content were found during the bloom, which reflected the relationship between nutrient concentrations, phytoplankton biomass and growth. Large increase in nutrient concentrations, particularly SiO_3-Si after the late autumn, is one of major reasons inducing the diatom bloom in winter, and the bloom was finally controlled due to SiO_3-Si depletion by phytoplankton. The bloom was mainly controlled by SiO_3-Si. Before 1998, relatively low level of SiO_3-Si kept ecological balance of eutrophication waters in the Jiaozhou Bay. In recent years, however, human activities have increased SiO_3-Si concentration, which is likely one of the primary cause for the increased diatom blooms in the Jiaozhou Bay. Therefore, it is necessary to control SiO_3-Si concentration in the Jiaozhou Bay.