Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Fish Species Compositions and the Application of Ecological Assessment Models to Bekjae Weir, Keum-River Watershed

금강 수계 백제보에서 어류의 종 특성 평가 및 생태평가모델 적용

  • Moon, Seong-Dae (Institute of Environmental Protection and Safety, NeoEnBiz Co.) ;
  • Han, Jeong-Ho (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • An, Kwang-Guk (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University)
  • 문성대 (네오엔비즈 환경안전연구소) ;
  • 한정호 (충남대학교 생명시스템과학대학 생명과학과) ;
  • 안광국 (충남대학교 생명시스템과학대학 생명과학과)
  • Received : 2015.01.15
  • Accepted : 2015.04.01
  • Published : 2015.06.30
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Abstract

The objectives of study were to evaluate fish species compositions of trophic guilds and tolerance guilds and apply ecological fish assessment (EFA) models to Bekjae Weir, Keum-River Watershed. The EFA models were Stream Index of Biological Integrity (SIBI) used frequently for running water and Lentic Ecosystem Health Assessment (LEHA) used for assessments of stagnant water. The region of Bekjae Weir as a "four major river project" was originally a lotic ecosystem before the weir construction (2010, $B_{WC}$) but became more like lentic-lotic hybrid system after the construction (2011, $A_{WC}$). In the analysis of species composition and ecological bioindicator (fish), fish species with a preference of running water showed significant decreases (p < 0.05), whereas the species with a preference of stagnant water showed significant increases (p < 0.05). After the weir construction, relative abundances of tolerant species increased, and the proportion of insectivores decreased. This phenomenon indicated the changes of biotic compositions in the system by the weir construction. Applications of SIBI and LEHA models to the system showed that the two model values decreased at the same time after the weir construction ($A_{WC}$), and the region became more like lentic-lotic hybrid system, indicating the degradation of ecosystem health. The model values of SIBI were 19 and 16, respectively, in the BWC and AWC, and the health conditions were both "C-rank". In the mean time, the LEHA model analysis showed that the values was 28 in the BWC and 24 in the AWC, thus the health was turned to be "B-Rank" in the BWC and "C-Rank" in the AWC. indicating a degradation of ecological heath after the weir construction.

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References

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