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http://dx.doi.org/10.11614/KSL.2022.55.4.398

Long-term Studies on Zooplankton Community in the Hwang River Ecosystem  

Eui-Jeong Ko (Team of Ecological and Natural Map, National Institute of Ecology)
Yu-Ji Heo (Department of Environmental Education, Sunchon National University)
Gea-Jae Joo (Department of Biological Science, Pusan National University)
Hyun-Woo Kim (Team of Ecological and Natural Map, National Institute of Ecology)
Publication Information
Korean Journal of Ecology and Environment / v.55, no.4, 2022 , pp. 398-405 More about this Journal
Abstract
The research was based on long-term studies on the major physico-chemical and hydrological factors and zooplankton community dynamics in the Hwang River. We had 341 times survey and collected zooplankton samples in the Hwang River of mid-Nakdong River from 1995 to 2013. We identified 97 zooplankton species, including 77 rotifers, 16 cladocerans, and 4 copepods. The total zooplankton abundance and species diversity were shown distinctive temporal variation (ANOVA, p<0.001). Annual average of zooplankton population density was 58.4±3.2 ind L-1 (n=341) and the lowest was 17.0±3.8 ind L-1 (1996, n=20), while the highest was 151.5±32.3 ind L-1 (2010, n=22). For zooplankton, small rotifer groups(e.g., Keratella sp., Brachionus sp., Trichotria sp.) dominated the study site for 19 years survey. Statistical analysis revealed that there were positive relationships with SiO2 (p=0.002) and water level (p<0.001) for the high abundance of rotifer community. There were considerable variations both the total cladocerans population and the number of cladocerans' species concerning annual precipitation. Despite the appearance of various zooplankton in the Hwang River, the mean population density remained low. Due to the lateral structures in the Nakdong River, the downstream basin of the Hwang River is inevitably affected. The zooplankton community in our study site is considered to be mainly influenced by external factors that can stably increase and maintain the volume of the water body and internal factors that induce an increase in food sources through the inflow of nutrients into the water body.
Keywords
zooplankton; long-term; Hwang River; tributary; rotifer;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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