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Survival Strategy of Dominant Diatom Chaetoceros debilis and Leptocylindrus danicus as Southwestern parts of East Sea - The availability of Dissolved Organic Nitrogen under Dissolved Inorganic Nitrogen-limited Environments

동해 남서해역에서 우점 규조류 Chaetoceros debilis와 Leptocylindrus danicus의 생존전략 - 용존 무기 질소 제한 환경에서 용존 유기 질소의 이용가능성

Yang, Han-Soeb;Jeon, Seul Gi;Oh, Seok Jin
양한섭;전슬기;오석진

  • Received : 2016.02.29
  • Accepted : 2016.04.27
  • Published : 2016.04.30

Abstract

The bioavailability of dissolved organic nitrogen (DON) by dominant species Chaetoceros debilis and Leptocylindrus danicus under dissolved inorganic nitrogen (DIN)-limited condition in the southwestern East Sea was conducted to assess the quantitative evaluation using growth kinetic experiment. Nitrogen sources were nitrate and ammonium as DIN, glycine and urea, which is portion component of DON in East Sea. Maximum specific growth rate (${\mu}_{max}$) and half-saturation constant ($K_s$) of C. debilis calculated from Monod equations were estimated to be $1.50day^{-1}$ and $1.62{\mu}M$ in nitrate, $1.13day^{-1}$ and $6.97{\mu}M$ in ammonium, $1.46day^{-1}$ and $3.36{\mu}M$ in glycine, $0.93day^{-1}$ and $0.55{\mu}M$ in urea, respectively. Also, L. danics was estimated to be $1.55day^{-1}$ and $5.21{\mu}M$ in nitrate, $1.57day^{-1}$ and $4.57{\mu}M$ in ammonium, $1.47day^{-1}$ and $3.80{\mu}M$ in glycine, $1.42day^{-1}$ and $1.94{\mu}M$ in urea, respectively. Both C. debilis and L. dancius have higher affinity of urea than DIN. The high affinity of urea was indicated that the dominant species were able to growth using urea under DIN-limited conditions. Thus, DON utilization of phytoplankton may be one of the important dominant strategy under DIN-limited environments such as southwestern East Sea.

Keywords

East Sea;Dissolved inorganic nitrogen;Dissolved organic nitrogen;Chaetoceros debilis;Leptocylindru danicus

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Acknowledgement

Supported by : 부경대학교