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The Spring Metazooplankton Dynamics in the River-Reservoir Hybrid System (Nakdong River, Korea): Its Role in Controlling the Phytoplankton Biomass  

Chang, Kwang-Hyeon (Research and Education Center for Inlandwater Environment, Shinshu University)
Jeong, Kwang-Seuk (Dept. of Biology, Pusan National University)
Joo, Gea-Jae (Dept. of Biology, Pusan National University)
Kim, Hyun-Woo (Dept. of Environmental Education, Sunchon National University)
Publication Information
Korean Journal of Ecology and Environment / v.36, no.4, 2003 , pp. 420-426 More about this Journal
Abstract
During a three-year study (2000-2002), dramatic changes in the phytoplankton biomass and high transparency were repeatedly observed during mid-spring in the lower part of the Nakdong River. Rotifers (Brachionus, Keratella, Polyarthra) , sharply increased toward the middle and end of spring. As hydrologic retention time increased (to near 20 days) and water temperature increased from $10^{\circ}C$ to > $20^{\circ}C$ toward the end of spring, small cladocerans noticeably increased. Once phytoplankton biomass passed their peak stage in the mid-spring, a short period (one or two weeks) of relatively low phytoplankton biomass and high Secchi transparencies occurred. Grazing by the zooplankton was highest in spring, thus, it seems that high grazing activities of zooplankton grazing regulated phytoplankton dynamics in the river. The results indicate that the role of zooplankton grazing in controlling the phytoplankton biomass becomes more important during the spring when river water is relatively stagnant.
Keywords
zooplankton grazing; phytoplankton biomass; hydrologic retention; regulated river; Nakdong River;
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