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http://dx.doi.org/10.13047/KJEE.2020.34.4.282

Long-term Changes of Fish Ecological Characteristics on the Gwanpyeong Stream Development and the Necropsy-based Health Assessments  

Oh, Ja Yun (Institute of Environment Biosystem, Chungnam National Univ.)
Lee, Sang-Jae (Chemical Safety Division, Jeonbuk Regional Environmental Office)
An, Kwang-Guk (Dept. of Biological Science, College of Bioscience and Biotechnology, Chungnam National Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.34, no.4, 2020 , pp. 282-293 More about this Journal
Abstract
This study investigated a long-term variation trend of water quality, fish compositions, and ecological health conditions in the Gwanpyeong stream located in the nearby Daejeon metropolitan city to understand the impact of urban development projects on the aquatic ecosystem. The sampling was made in four surveys (2009, 2010, 2016, 2019) before and after urbanization. The urban development was conducted in 2008, resulting in the stream's ecological disturbance, and the stream restoration was conducted in 2012. Thus, stream monitoring was conducted to analyze the ecological trends before and after the restoration. The multi-metric models for Fish Assessment Index(FAI) and necropsy-based Health Assessment Index(HAI) were applied in the fish community and organ-level, respectively, to assess the ecological health of the stream. Minimum turbidity and chlorophyll-a(Chl-a) occurred in the mid-stream(St. 2), and this was probably due to rapid current velocity in the riffle zone. We collected 18 fish species, and the dominant species was Zacco platypus (40.6%). In 2016 immediately after the stream restoration, the relative proportions of sensitive species and insectivore species were the highest along with highest values in the species diversity and species richness index, resulting in the best condition in the ecological health, based on FAI model values. However, the ecological health, based on the FAI, became worse in the latest survey conducted in 2019. The analysis of the HAI model based on the organ-level approach showed skin erosion in the fish of upper stream, kidney defects in downstream, and the liver and gill defects observed in all sites, indicating that the anatomical health was also affected.
Keywords
STREAM RESTORATION; FISH COMPOSITION; FAI; ECOLOGICAL HEALTH;
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