Spatio-temporal Variability and Size Fractionation of Chlorophyll a in the Jeju Marine Ranching Area(JMRA) with Special Reference to the Signification of Nanoplankton

제주 바다목장 해역 크기별 엽록소 a의 시·공간적 분포 특성과 미소플랑크톤의 중요성

  • Yoon, Yang Ho (Faculty of Marine Technology, Chonnam National University)
  • Received : 2014.06.19
  • Accepted : 2014.10.10
  • Published : 2014.10.31


To understand size fractioned chlorophyll a and material cycle characteristics in Jeju marine ranching area (JMRA), 4 times of survey were conducted from April to November 2008. Picoplankton on the surface in JMRA was on average, $0.30{\mu}g/L$(annual mean(M):17.3%) in the $0.03{\sim}0.84{\mu}g/L$ range, accounting for 17.3%. Nannoplankton and picoplankton was on average, $1.35{\mu}g/L$(M:78.0%) in the $0.22{\sim}3.93{\mu}g/L$ range, and $1.73{\mu}g/L$(M:4.7%) in the nd ~ 0.24 range, respectively. The 10m layer was similar to the surface. The measured values changed according to the measurement times but the nanoplankton composition ratio was higher throughout the year. In addition, the size fractioned chlorophyll a distribution in JMRA was similar to that of tropical sea area affected by the Monsoon rather than South Korean offshore coast geographically adjacent to the East China Sea and Japan coastal waters affected by the Kuroshio/Tsushima warm currents. That is, the material cycle of JMRA 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.


chlorophyll a;spatio-temporal variation;size fractionation;nanoplankton;top-down dynamics;Jeju marine ranching area


Supported by : 한국연구재단


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