The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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The Importance of Dissolved Organic Nutrients on the Interspecific Competition between the Harmful Dinoflagellate Cochlodinium polykrikoides and the Diatom Skeletonema sp.

유해 와편모조류 Cochlodinium polykrikoides와 규조류 Skeletonema sp.의 종간경쟁에서 용존 유기 영양염의 중요성

  • Kwon, Hyeong Kyu (Korea Inter-University Institute of Ocean Science, Pukyong National University) ;
  • Kim, Hyun Jung (Department of Oceanography, Pukyong National University) ;
  • Yang, Han-Soeb (Department of Oceanography, Pukyong National University) ;
  • Oh, Seok Jin (Department of Oceanography, Pukyong National University)
  • Received : 2014.08.12
  • Accepted : 2014.10.11
  • Published : 2014.11.28
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Abstract

We investigated the interspecific competition between the harmful dinoflagellate Cochlodinium polykrikoides and diatom Skeletonema sp. based on the utilization and uptake of dissolved organic nutrients. C. polykrikoides and S. costatum were able to grow using dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) as well as dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP). This result indicates that the utilization of dissolved organic nutrients may play a role in surviving strategy in the DIN or DIP-limited environments. The half-saturation constants (Ks) of urea and glycerophosphate (glycero-P) calculated from uptake kinetics experiment of C. polykrikoides was lower than those of Skeletonema sp. This result indicates that Skeletonema sp. have higher affinity for dissolved organic nutrients, such as urea and glycero-P, than C. polykrikoides. Although Skeletonema sp. have higher affinity of dissolved organic nutrients, C. polykrikoides could effectively uptake for urea and glycero-P at sub-saturating nutrient concentrations (${\alpha}$ (${\rho}_{max}/Ks$) of C. polykrikoides was higher than Skeletonema sp.. Therefore, C. polykrikoides by utilization and effectively uptake of dissolved organic nutrients under monoculture may have an advantageous position in the interspecific competition with Skeletonema sp. in the low nutrient environments.

본 연구는 유해 와편모조류 Cochlodinium polykrikoides와 규조류 Skeletonema sp.의 용존 유기 영양염에 대한 이용 및 흡수능력을 통해서 종간 경쟁관계를 파악하였다. C. polykrikoides와 Skeletonema sp.는 용존 무기 질소와 무기인 이외에 다양한 용존 유기 질소와 유기 인을 이용하여 성장하였다. 이는 용존 무기 질소 또는 무기 인이 제한 영양염으로 작용하는 환경에서 중요한 생존전략으로 작용할 것이다. Urea와 glycerophospahte(glycero-P)의 흡수동력학 실험으로부터 도출된 반포화상수(Ks) 값은 C. polykrikoides가 Skeletonema sp.에 비해서 낮은 값을 보였다. 이는 Skeletonema sp.가 C. polykrikoides에 비해서 urea와 glycero-P와 같은 유기 영양염에 대한 친화성이 높음을 의미한다. 하지만 Skeletonema sp.가 유기 영양염에 대한 친화성이 높을지라도 C. polykrikoides가 ${\alpha}$ (${\rho}_{max}/Ks$) 값이 높아, 저농도의 영양염 조건(

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참고문헌

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