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Patterning Zooplankton Dynamics in the Regulated Nakdong River by Means of the Self-Organizing Map  

Kim, Dong-Kyun (Department of Biology, Pusan National University)
Joo, Gea-Jae (Department of Biology, Pusan National University)
Jeong, Kwang-Seuk (Department of Biology, Pusan National University)
Chang, Kwang-Hyson (Center for Marine Environmental studies, Ehime University)
Kim, Hyun-Woo (Department of Environmental Education, Sunchon National University)
Publication Information
Korean Journal of Ecology and Environment / v.39, no.1, 2006 , pp. 52-61 More about this Journal
Abstract
The aim of this study was to analyze the seasonal patterns of zooplankton community dynamics in the lower Nakdong River (Mulgum, RK; river kilometer; 27 km from the estuarine barrage), with a Self-Organizing Map (SOM) based on weekly sampled data collected over ten years(1994 ${\sim}$ 2003). It is well known that zooplankton groups had important role in the food web of freshwater ecosystems, however, less attention has been paid to this group compared with other community constituents. A non-linear patterning algorithm of the SOM was applied to discover the relationship among river environments and zooplankton community dynamics. Limnological variables (water temperature, dissolved oxygen, pH , Secchi transparency, turbidity, chlorophyll a, discharge, etc.) were taken into account to implement patterning seasonal changes of zooplankton community structures (consisting of rotifers, cladocerans and copepods). The trained SOM model allocated zooplankton on the map plane with limnological parameters. Three zooplankton groups had high similarities to one another in their changing seasonal patterns, Among the limnological variables, water temporature was highly related to the zooplankton community dynamics (especially for cladocerans). The SOM model illustrated the suppression of zooplankton due to the increased river discharge, particularly in summer. Chlorophyll a concentrations were separated from zooplankton data set on the map plane, which would intimate the herbivorous activity of dominant grazers. This study introduces the zooplankton dynamics associated with limnological parameters using a nonlinear method, and the information will be useful for managing the river ecosystem, with respect to the food web interactions.
Keywords
Self-Organizing Map; rotifer; cladoceran; copepods; the Nakdong River; Regulated River;
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