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http://dx.doi.org/10.11614/KSL.2018.51.4.287

Spatial and Temporal Distribution of Zooplankton Communities in Lake Paldang  

Sim, Youn-Bo (Han River Environment Research Center, National Institute of Environmental Research)
Jeong, Hyun-Gi (Watershed Ecology Research Team, National Institute of Environmental Research)
Im, Jong-Kwon (Han River Environment Research Center, National Institute of Environmental Research)
Youn, Seok-Jea (Han River Environment Research Center, National Institute of Environmental Research)
Byun, Myeong-Seop (Han River Environment Research Center, National Institute of Environmental Research)
Yoo, Soon-Ju (Han River Environment Research Center, National Institute of Environmental Research)
Publication Information
Korean Journal of Ecology and Environment / v.51, no.4, 2018 , pp. 287-298 More about this Journal
Abstract
The zooplankton community and environmental factor were investigated on a weekly basis from March to November 2015 in Lake Paldang, Korea. The seasonal succession of zooplankton community structure was influenced by hydraulic and hydrological factors such as inflow, outflow and rainfall. However, the hydraulic retention time in 2015 (16.3 day) was affected by the periods of water shortage that had continued since 2014 and increased substantially compared to 2013 (7.3 day). Therefore, the inflow and outflow discharge were decreased, and the water quality (COD, BOD, TOC, TP, Chl-a) of Lake Paldang (St.1) was the same characteristics as the river type Bukhan river (St.3), compared with the lake type Namhan river (St.2) and Gyeongan stream (St.4). Zooplankton community dominated by rotifers (Keratella cochlearis, Synchaeta oblonga) in spring (March to May). However, Copepod (Nauplius) and Cladoceran (Bosmina longirostris) dominated in St.4. In summer (June to August), there was a few strong rainfall event and the highest number of individuals dominated by Keratella cochlearis (Rotifera) and Difflugia corona (Protozoa) were shown during the study period. In autumn (October to November), the water temperature was decreased with decrease in the total number of individuals showing Nauplius (Copepoda) as the dominant species. As a result of the statistical analysis about zooplankton variation in environmental factors, the continuous periods of water shortage increased the hydraulic retention time and showed different characteristic for each site. St.1, St.3 and St.2, St.4 are shown in the same group (p<0.05), showing the each characteristics of river type and lake type. Therefore, the water quality of catchment area and distribution of zooplankton community would be attributed to hydraulic and hydrological factors.
Keywords
zooplankton; community dynamics; hydraulic and hydrological factors; spatial and temporal change; Lake Paldang;
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