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      Response of Phytoneuston Community to Organic Nitrogen and Phosphorus Revealed by HPLC-Pigments Method

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          The sea surface microlayer (SML) is the thin boundary layer between the ocean and the atmosphere. Phytoplankton community in the SML is known as phytoneuston and has a different community structure and biomass from the phytoplankton of the underlying bulk water. In this study, water samples were collected from the SML of Daya Bay in southern China in September, October, and December of 2013. Algal growth potential (AGP) tests were conducted by adding different forms of nitrogen ( N), phosphorus (P) and silicate (Si). Phytoneuston grew well with both inorganic and organic nutrients, and showed comparable community structure after nutrient addition. A total of 16 pigments were analyzed in the SML samples collected from Daya Bay in this study. Phytopigments were dominated by the cyanobacteria-diagnostic pigment (zeaxanthin, Zea) in September and October, and by diatom- diagnostic pigment (fucoxanthin, Fuco) in December. The concentrations and proportions of Fuco increased greatly after the nutrient addition, and the concentrations and proportions of Zea decreased accordingly. Additionally, the diatom pigment index (DiatDP) increased after nutrient addition, and the prokaryotic pigment index (ProkDP) conversely decreased. The results suggested that massive occurrences of Zea and cyanobacteria are important characteristics of phytoneuston structure in Daya Bay especially in warm seasons, and nutrient addition especially Si addition promoted the growth of diatoms.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 853-864
          1College of Life Science and Technology, Jinan University, Guangzhou 510632, China
          Author notes
          *Corresponding author: WANG Zhaohui, E-mail: twzh@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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