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An Application of $^{13}C$ Tracer for the Determination of Size Fractionated Primary Productivity in Upper Stream of Lake Shihwa  

Lee, Yeon-Jung (Department of Environmental Marine Sciences, Hanyang University)
Kim, Min-Seob (Department of Environmental Marine Sciences, Hanyang University)
Won, Eun-Ji (Department of Environmental Marine Sciences, Hanyang University)
Shin, Kyung-Hoon (Department of Environmental Marine Sciences, Hanyang University)
Publication Information
Korean Journal of Ecology and Environment / v.39, no.1, 2006 , pp. 93-99 More about this Journal
Abstract
Primary productivity was determined by using $^{13}C$ tracer according to different cell size of phytoplank-ton through in situ incubation experiments in upper stream of the Lake Shihwa. The average concentration of chlorophyll a was 14 ${\mu}g\;L^{-1}$ demonstrating an eutrophic water. The ratio of POC/Chl-a was lower than 30, reflecting that the origin of organic matter might be mainly phytoplankton. The primary productivity was 93.9 mgC m^{-2}\;d^{-1}$ at St. 1, which was about 40-fold lower than the average value of the lake (3,972 mgC m^{-2}\;d^{-1}$) determined by Choi et al. (1997) before opening of gate but it was higher than the average primary productivity (3.98 mgC m^{-2}\;d^{-1}$) reported by KOWACO in 1993 before constructing dam. The fractionated size (20 ${\sim}$ 53 ${\mu}m$) of phytoplankton community account for 51% of total primary productivity, indicating the highest assimilation rate. This study suggest that $^{13}C$ tracer methodology should be applied as a useful approach for the water ecological research in the future.
Keywords
$^{13}C$ tracer method; primary productivity; size fraction; phytoplankton; Lake Shihwa;
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