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Algae > Volume 13(1); 1998 > Article
Algae 1998;13(1): 101-107.
The Ecology of Picoplankton in Korea: I. The Western Channel of the Korea Strait
-Kyo chung, Yoon-Hyang Kang, Young-Jin Kim, O-Seob Kwon
Department of Marine Science, Pusan National University, Department of Environmental Science, Inje University
The ecology of picoplankton in terms of the primary production and the heterotrophic bacterioplankton production in the western channel of the Korea Strait was studied in September 1996 (summer) and February 1997 (winter). The super(14)C method and super(3)H-thymidine incorporation method were applied to measure the productivities. The average chlorophyll concentrations were 0.92 μgchla·l super(-1) in summer and 0.33μgchla·l super(-1) in winter. The average primary productivities were estimated as 3.60 μgC·l super(-1)·h super(-1) in summer and 1.74 μgC·l super(-1)·h super(-1) in winter. The chlorophyll concentrations of picoplankton were not detectable to 0.03 μgchla·l super(-1) (~2.67%) in summer and 0.07 μgchla·l super(-1) (~10.75%) in winter. The primary productivity of picoplankton raged from 0.16 to 0.49 μgC·l super(-1)·h super(-1) in summer and from 0.06 to 0.15 μgC·l super(-1)·h super(-1) in winter. The average of bacterial secondary production (BSP) in summer was 0.23 μgC·l super(-1)·h super(-1). Significantly higher rates (0.78 to 1.50 μgC·l super(-1)·h super(-1)) were observed at the stratified near shore surface wasters in summer. The BSPs of below the thermocline and in the middle of the channel ranged from 0.01 to 0.23 μgC·l super(-1)·h super(-1) (average 0.07 μgC·l super(-1)·h super(-1)). The winter BSPs ranged from 0.05 to 0.51 μgC·l super(-1)·h super(-1) (average 0.17 μgC·l super(-1)·h super(-1)). Relatively higher rates were found around the depth of winter thermocline in the middle of the channel. The summer BSOs showed significantly positive correlations with chlorophyll a contents (r super(2)=0.96) and numbers of bacteria (r super(2)=0.59). Although chlorophyll a content and phosphate concentration were significantly correlated in winter, the BSPs did not show such significant correlation with those found in summer.
Key words: bacterial secondary production, picoplankton, primary production, the korea Strait

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