Effects of Dissolved Organic Nitrogen on the Growth of Dominant Phytoplankton in the Southwestern Part of East Sea in Late Summer

늦여름 동해 남서해역에서 용존 유기 질소가 우점 식물플랑크톤의 생장에 미치는 영향

  • Received : 2015.11.27
  • Accepted : 2016.02.25
  • Published : 2016.02.28


We investigated the distribution of dissolved nutrients, phytoplankton community structure and utilization of nitrogen compounds by dominant species in the southwestern part of East Sea in September, 2014. Dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) were lower in the surface layer, and concentrations were increased with depth. Dissolved organic nitrogen (DON) and dissolved organic phosphorus were the opposite of dissolved inorganic nutrients. Although DIN DIP ratio in all of the water masses was higher than Redfield ratio (16), DIN : DIP ratio in mixed layer was about 2, indicating that inorganic nitrogen is the limiting factor for the growth of phytoplankton. In particular, DON proportion in dissolved total nitrogen was about 88 % in the mixed layer where inorganic nitrogen is limiting factor. The dominant species Chaeotceros debilis and Prorocentrum minimum were able to grow using DIN as well as DON such as urea and amino acids. Therefore, DON utilization of phytoplankton may play a role as a survival strategy in the DIN-limited conditions of East Sea.


East Sea;Dissolved inorganic nitrogen;Dissolved inorganic phosphorus;Dissolved organic nitrogen;Dissolved organic phosphorus;Chaetoceros debilis;Prorocentrum minimum


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