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http://dx.doi.org/10.17820/eri.2022.9.2.100

Impact of the Crossed-Structures Installed in Streams and Prediction of Fish Abundance in the Seomjin River System, Korea  

Moon, Woon Ki (Department of Environmental Ecology, Environment Solution Partners, Co.)
Noh, Da Hye (Department of Environmental Ecology, Environment Solution Partners, Co.)
Yoo, Jae Sang (Department of Environmental Ecology, Environment Solution Partners, Co.)
Lim, O Young (Department of Environmental Ecology, Environment Solution Partners, Co.)
Kim, Myoung Chul (SOKN Institute of Ecology and Conservation, Inc.)
Kim, Ji Hye (Watershed Planning Division, Yeongsan River Basin Environmental Office)
Lee, Jeong Min (Watershed Planning Division, Yeongsan River Basin Environmental Office)
Kim, Jai Ku (Department of Environmental Ecology, Environment Solution Partners, Co.)
Publication Information
Ecology and Resilient Infrastructure / v.9, no.2, 2022 , pp. 100-106 More about this Journal
Abstract
The relationships between river length and weir density versus fish species observed were analyzed for 210 local rivers in the Seomjin River system (SJR). A nonlinear exponential relationship between river length and number of fish species were observed. Model coefficient was 0.03 and coefficient of determinant (R2) was 0.59, meaning that about 59.0% of total variance was explained by river length variable. Predicted value by model and observed number of species showed a difference. About 110 local rivers (about 52.4%) showed lower value than predictive value. The average index of weir's density (IWD) in the SJR was about 2.7/km, which was significantly higher than that of other river basins. As a result of nonparametric 2-Kimensional Kolmogorov-Smirnov (2-DKS) analysis based on the IWD, the threshold value affecting fish diversity was about 2.5/km (Dmax=0.048, p<0.05). Above the threshold value, it means that the number of fish species would be decreased. In fact, the ratio of the expected species to the observed species was lowered to less than 70%, when the IWD is higher than the threshold value. To maintain aquatic ecological connectivity in future, it is necessary to manage IWD below the threshold value.
Keywords
2-DKS; Density of weir; Fish diversity; Nonlinear exponential relationship; Seomjin river system; Threshold value;
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