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Spatio-temporal Fluctuation of Phytoplankton Size Fractionation in the Uljin Marine Ranching Area (UMRA), East Sea of Korea

동해 울진 바다목장해역의 크기별 식물플랑크톤 생물량의 시·공간적 분포 특성

  • Yoon, Yang Ho (Faculty of Marine Technology, Chonnam National University)
  • Received : 2016.08.24
  • Accepted : 2016.09.20
  • Published : 2016.09.30

Abstract

To understand size fractioned chlorophyll a and material cycles of coastal ecosystem in Uljin marine ranching area (JMRA) of East Sea, 4 times of survey were conducted from April to November 2008. Picoplankton, nanoplankton and netplankton in the surface of UMRA fluctuated with an annual mean of $0.26{\mu}g\;L^{-1}$ between the lowest value of $0.03{\mu}g\;L^{-1}$ and the highest value of $0.87{\mu}g\;L^{-1}$, annual mean $1.32{\mu}g\;L^{-1}$ between $0.11{\mu}g\;L^{-1}$ and $5.60{\mu}g\;L^{-1}$, annual mean $0.45{\mu}g\;L^{-1}$ between no detected (nd) and $4.68{\mu}g\;L^{-1}$, respectively. And the relative ratio of picoplankton, nanoplankton and netplanktons on the phytoplankton biomass was on annual average 12.9%, 65.0% and 22.1%, respectively. The 10 m layer was similar to the surface. The relative ratio of pico- and nano-plankton was higher throughout the year. That is, the material cycle of UMRA consists of a microbial food web rather than traditional food chain at a lower trophic levels. Primary production is deemed to have a higher possibility of being adjusted by top-down dynamics, such as micro-zooplankton grazing pressure rather than nutrients supply.

동해 울진 바다목장해역에서 크기별 식물플랑크톤 구성비 및 물질순환 특성을 파악하기 위한 현장조사는 2008년 4월에서 11월까지 4회 실시하였다. 바다목장해역 표층의 피코플랑크톤은 $0.03{\sim}0.87{\mu}g\;L^{-1}$의 변동 폭으로 연평균 $0.26{\mu}g\;L^{-1}$로 12.9% 구성비를 나타내었고, 나노플랑크톤은 $0.11{\sim}5.60{\mu}g\;L^{-1}$의 범위로 연평균 $1.32{\mu}g\;L^{-1}$로 65.0%, 네트플랑크톤은 nd~$4.68{\mu}g\;L^{-1}$의 범위로 연평균 $0.45{\mu}g\;L^{-1}$로 22.1%를 차지하였다. 10 m 수심도 다소 측정값의 차이는 있지만, 변동양상은 표층과 유사하였다. 시간적으로는 여름 네트플랑크톤 구성비가 30%까지 상승하였지만, 연간 피코 및 나노플랑크톤 구성비가 70% 이상으로 높은 특징을 보였다. 즉 동해 바다목장해역의 물질순환은 계절에 따라 다소 차이는 있지만, 전체적으로는 담수유입이 원활한 연안해역의 먹이사슬 구조 (bottom-up)보다는 빈영양 환경특성으로 생태계순환에 의한 물질순환 (top-down)에 더욱 크게 영향을 받는 것으로 판단할 수 있었다.

Keywords

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