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Temporal and Spatial Variations of Size-structured Phytoplankton in the Asan Bay  

Hyun Bong-Kil (Division of Ocean System Engineering, Mokpo National Maritime University)
Sin Yong-Sik (Division of Ocean System Engineering, Mokpo National Maritime University)
Park Chul (Department of Oceanography, Chungnam National University)
Yang Sung-Ryull (Department of Environmental Engineering, Kwangju University)
Lee Young-Joon (Youngsan-River Environment Research Laboratory, National Institute of Environmental Research)
Publication Information
Korean Journal of Environmental Biology / v.24, no.1, 2006 , pp. 7-18 More about this Journal
Abstract
Samples were collected from five stations monthly from October 2003 to September 2004 to investigate seasonal variation of size structure of phytoplankton and relationship between size-fractionated phytoplankton and environmental factors in the Asan Bay. The contribution of large cells (microphytoplankton, $>20\;{\mu}m$) to total concentrations of chlorophyll $\alpha$ was higher than small cells (nanophytoplankton, $3\sim20\;{\mu}m$; picophytoplankton, $<3\;{\mu}m$) during the sampling period. Especially, large cells contributed 80% to the total chlorophyll a from February, 2004 to April 2004 when chlorophyll $\alpha$ concentrations were high. The size structure of phytoplankton shifted from micro-size class to nano-size class and picophytoplankton rapidly increased when phytoplankton biomass decreased in May 2004. Microphytoplankton exhibited a high biomass in the upper region during winter-spring season whereas nano- and picophytoplankton showed two peaks in the middle-lower regions (Station 3,5) during spring and summer. Microphytoplankton are most likely controlled by water temperature and nutrient supply during the cold season whereas nano- and picophytoplankton may be affected by stratification, light exposure during the warm season.
Keywords
Asan Bay; size-fractionated phytoplankton; controlling factors;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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