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Fish Distribution, Compositions and Community Structure Characteristics during Juksan-Weir Construction in Yeongsan River Watershed  

Ko, Dae-Geun (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Choi, Ji-Woong (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Lim, Byung Jin (Yeongsan River Environment Research Center)
Park, Jong Hwan (Yeongsan River Environment Research Center)
An, Kwang-Guk (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Publication Information
Korean Journal of Environment and Ecology / v.26, no.6, 2012 , pp. 892-901 More about this Journal
Abstract
The purpose of this research was to analyze fish fauna, distribution patterns, and fish community structures in the Juksan-Weir regions of upper weir(R-UW) and lower weir(R-LW), which was constructed in 2011 on Yeongsan River watershed. Our outcomes will provide valuable information in the impact analysis of weir constructions next decades, even if the current research is limited to distributions and fauna studies of fishes. The fishes observed were 8 family and 30 species in all the sites, and the number of the species in the regions of R-UW and R-LW was 23(938 individuals) and 27(1,680 individuals), respectively, indicating greater abundance in the lower region of Juksan-Weir. Most dominant species was Opsarichthys uncirostris amurensis with relative abundance of 42%, and this species had greater abundance in the R-LW(49%) than in the R-UW(30%). Coilia nasus, was the migratory fish sampled in this region and had no differences of abundance between the two regions. The extic species observed were Carassius cuvieri, Lepomis macrochirus, and Micropterus salmoides. The two formers of Carassius cuvieri(1.2%) and Lepomis macrochirus(3.7%) dominated in the R-UW, whereas Micropterus salmoides had greater dominance in the region of R-LW. According to tolerance guild analysis, the proportion of sensitive species ranged from 0.4 to 0.5%, and that of tolerant species ranged from 65% to 70%, implying a severe pollution of nutrients and organic matters in the water body. In the mean time, according to trophic guild analysis, the proportion of carnivores(57 - 77%) was evidently higher than that of insectivores(10 - 20%), indicating a dominance of the carnivores. Especially, high abundance of the bass, exotic species, may disturb the fish overall food chain, so the efficient ecosystem management may be required for the conservation of endemic species. When we examined fish data files of last 60 years, the species of Culter brevicauda, designated as endangered species, was observed firstly in our research area and the total number was 5 individuals(0.2% of the total). So, this region observed should be conserved as a protection zone and further monitoring studies should be done in the future.
Keywords
EXOTIC SPECIES; FISH FAUNA; WEIR CONSTRUCTION; Culter brevicauda;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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