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Seasonal Variability of Picoplankton Around Ulneung Island

울릉도 주변 해역의 극미소플랑크톤 분포 특성

  • Shim, Jeong-Min (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Yun, Suk-Hyun (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Hwang, Jae-Dong (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Jin, Hyun-Gook (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Lee, Yong-Hwa (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Kim, Young-Suk (Marine Environment Division, East Sea Fisheries Research and Development Institute) ;
  • Yun, Sang-Chul (Marine Environment Division, East Sea Fisheries Research and Development Institute)
  • 심정민 (국립수산과학원 동해수산연구소) ;
  • 윤석현 (국립수산과학원 동해수산연구소) ;
  • 황재동 (국립수산과학원 동해수산연구소) ;
  • 진현국 (국립수산과학원 동해수산연구소) ;
  • 이용화 (국립수산과학원 동해수산연구소) ;
  • 김영숙 (국립수산과학원 동해수산연구소) ;
  • 윤상철 (국립수산과학원 동해수산연구소)
  • Published : 2008.11.30

Abstract

The seasonal variations of picoplankton including Prochlorococcus, Synechococcus and Picoeukayotes around Ulneung Island were investigated by flow cytometry in spring, summer and autumn in 2006. All groups of picoplankton showed clear seasonal patterns in population abundance. Among the group, Synechococcus showed the most prominent seasonal variation during the study period. The maximal abundance of Synechococcus occurred in summer and the lowest in autumn. The seasonal distribution of Prochlorococcus displayed the reverse tendency with that of Synechococcus. The abundance of Prochlorococcus ranged from $2.9{\times}10^3$ cells/ml in summer to $311{\times}10^3$ cells/ml in autumn. However, the seasonal distribution of Picoeukaryotes was shown to be relatively constant, and the maximal abundance was $81.5{\times}10^3$ cells/ml in summer. The highest abundance of Picoeukaryotes occurred in summer and the lowest in autumn and the seasonal distribution in abundance of Picoeukaryotes showed a similar trend with that of Synechococcus. The estimated total carbon biomass of picoplankton were ranged from $74.7\;mg\;C/m^2$ to $1,055.9\;mg\;C/m^2$. The highest total carbon biomass occurred in summer, but lowest occurred in autumn. The pattern of the contribution of three picoplankton to total autotrophic picoplankton carbon is different. The contribution of Synechococcus to total autotrophic picoplankton carbon is increased to 75%, but the contribution of Prochlorococcus dropped to 12% in summer. The contribution of Picoeukaryotes is ranged from 24% in summer to 72.5% in spring.

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