title: Nutrients structure changes impact the competition and succession between diatom and dinoflagellate in the East China Sea.
abstract: Nutrients variations caused by anthropogenic activities alter phytoplankton community interactions, especially competition and succession between two algal species. East China Sea experiences annual successions of Skeletonema costatum and Prorocentrum donghaiense and large-scale blooms of P. donghaiense. In this study, the growth and competition responses of S. costatum and P. donghaiense to different inorganic nutrients structure were evaluated through field and indoors experiments to further understand the nutrients mechanism of these events. Results showed that low Si/N ratio (Si/N<1) and high N/P (>50) possibly accelerated P. donghaiense outbreak and decreased Si/N caused by low Si concentration could speed up S. costatum decay. Excessive DIN also accelerated blooms dominated by P. donghaiense (Dtup to -3) when S. costatum perished. Increased DIN loads from anthropogenic activities were possibly responsible for the changes in phytoplankton communities and dinoflagellate outbreak when Si concentration decreased as a result of governmental control efforts. With effective management practices for Si and P reductions worldwide, managers should be aware of the negative implications of unsuccessful management of system N loading because N may significantly alter the composition and ecosystem of phytoplankton communities.
authors.affiliation: Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China.
authors.forename: Yanmin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Li
authors.affiliation: College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China.
authors.forename: Liju
authors.initials: L
authors.lastname: Tan
authors.affiliation: Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China. Electronic address: jtwang@ouc.edu.cn.
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Wang
mesh_terms: D002681:China; D017377:Diatoms / Q000254:growth & development*; D004141:Dinoflagellida / Q000254:growth & development*; D017753:Ecosystem; D004784:Environmental Monitoring; D009584:Nitrogen; D010758:Phosphorus; D010839:Phytoplankton / Q000254:growth & development*; D012623:Seawater / Q000737:chemistry*; D012825:Silicon
chemical_list: D010758:Phosphorus; D009584:Nitrogen; D012825:Silicon
keywords: Diatom; Dinoflagellate; East China Sea; Nutrients variations; Succession