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Effects of Turbid Water on Fish Community: Case Studies of the Daegi Stream and the Bong-san Stream  

Kim, Jai-Ku (Department of Environmental Science, Kangwon National University)
Choi, Jae-Seok (Institute of Environmental Research, Kangwon National University)
Jang, Young-Su (Department of Environmental Science, Kangwon National University)
Lee, Kwang-Yeol (Department of Biology, Kangwon National University)
Kim, Bom-Chul (Department of Environmental Science, Kangwon National University)
Publication Information
Korean Journal of Ecology and Environment / v.40, no.3, 2007 , pp. 459-467 More about this Journal
Abstract
The effects of turbid water on fish community was investigated in a clear reference stream (the Bongsan Steam) and a turbid stream (the Daegi Stream) located in the upstream region of the South Han River, Korea. The stress index (SI) of suspended solids (SS) were calculated during a rain event concentration by the equation SI=LN (SS${\times}$duration). EMC of SS was $1{\sim}13$ mg $L^{-1}$ in the clear stream with a mean SI of 5.2, while SS was $97{\sim}1,150$ mg $L^{-1}$ in the turbid stream with a mean SI of 10.3. Even though the number of species was not much different, the dominant species of the two steams were distinctly different. The reference stream was dominated by upstream species such as Rhynchocypris kumgangensis, Brachymystax lenok tsinlingensis, and Cottus poecilopus which are typical upstream community. Whereas the turbid streams was dominated by Rhynchocypris kumgangensis, Zacco koreanus, and Orthrias nudus which are representatives of middle reache community. Fish density was four times higher in the clear steam than the turbid stream. In the similarity analysis of fish communities the community of the turbid stream showed large dissimilarity with other communities in other streams of similar size. In conclusion, although turbidity might be at the sublethal concentration, fish communities are under stress in some turbid streams of Korea that is strong enough to induce community change. It can be an example of a chronic ecological toxicity of turbidity at the community level.
Keywords
chronic ecological toxicity; fish community; stress index; turbid water;
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