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New ecological health assessment approaches of an urban stream using molecular and physiological level biomarkers and bioindicators

  • Kim, Ja-Hyun (Environmental Toxicology Research Center, Korea Institute of Toxicology) ;
  • Yeom, Dong-Hyuk (Environmental Toxicology Research Center, Korea Institute of Toxicology) ;
  • Kim, Joon-Ha (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • An, Kwang-Guk (School of Bioscience and Biotechnology, Chungnam National University)
  • Received : 2011.09.20
  • Accepted : 2012.12.23
  • Published : 2012.08.31

Abstract

This study evaluated ecological health, using various biomarkers and bioindicators, of pale chub (Zacco platypus) as a sentinel species, in Daejeon Stream, South Korea, during AprilMay 2011. The biomarkers and bioindicators were compared among three sites of control: Reference ($C_z$), transition ($T_z$), and the urban zones ($U_z$); and the 7-Ethoxyresorufin-O-deethylase (EROD) activity, DNA damage, acetylcholinesterase (AChE) activity, and vitellogenin (VTG) concentrations were more significantly increased in the $U_z$ than in the $C_z$. Also, physiological markers such as condition factor, liver somatic index, visceral somatic index, and gonad somatic index were significantly increased in the $U_z$ than in the $C_z$. For the health assessments, three categorized parameters of blood chemistry, molecular biomarkers, and physiological bioindicators were standardized and calculated as a star-plot, representing values of Integrated Health Response (IHR). Values of IHR had more significant (P<0.05) increases in the $U_z$ than any other zones, indicating an impairment of ecological health by organic matter, nutrients (N, P), and toxic chemicals. This study is based on low levels of biological organization approach of molecular and physiological biomarkers and bioindicators, so further study of high-levels of biological organization approach such as community and population is required for overall range of health assessments. The approach of IHR values, however, may be useful in providing early warning of future impacts on ecological health.

Keywords

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