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KMID : 1024520080170111243
Journal of the Environmental Sciences
2008 Volume.17 No. 11 p.1243 ~ p.1253
Seasonal Variability of Picoplankton Around Ulneung Island
Shim Jeong-Min

Youn Seok-Hyun
Hwang Jae-Dong
Jin Hyun-Gook
Lee Yong-Hwa
Kim Young-Suk
Yun Sang-Chul
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 cells/ml in summer to cells/ml in autumn. However, the seasonal distribution of Picoeukaryotes was shown to be relatively constant, and the maximal abundance was 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 to . 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.
KEYWORD
Picoplankton, Flow cytometry, Carbon biomass, Size-fractioned chlorophyll-a
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