도심하천 생태계의 수환경 평가를 위한 생지표 바이오마커 및 바이오인디케이터메트릭 속성 및 다변수 생태 모형
Multiple-biometric Attributes of Biomarkers and Bioindicators for Evaluations of Aquatic Environment in an Urban Stream Ecosystem and the Multimetric Eco-Model.
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The objectives of the study were to evaluate the aquatic environment of an urban stream using various ecological parameters of biological biomarkers, physical habitat quality, and chemical water quality and to develop a "Multimetric Eco-Model" (Mm-E Model) for the ecosystem evaluations. For the applications of the Mm-E model, three zones including the control zone (CZ) of headwaters, transition zone (TZ) of mid-stream and the impacted zone (IZ) of downstream were designated and analyzed the seasonal variations of the model values. The biomarkers of DNA, based on the comet assay approach of single-cell gel electrophoresis (SCGE), were analyzed using the blood samples of Zacco platypus as a target species, and the parameters were used tail moment, tail DNA(%) and tail length (㎛) in the bioassay. The damages of DNA were evident in the impacted zone, but not in the control zone. The condition factor (CF) as key indicators of the population evaluation indicator was analyzed along with the weight-length relation and individual abnormality. The four metrics of Qualitative Habitat Evaluation Index (QHEI) were added for the evaluations of physical habitat. In addition, the parameters of chemical water quality were used as eutrophic indicators of nitrogen (N) and phosphorus (P), chemical oxygen demand (COD), and conductivity. Overall, our results suggested that attributes of biomarkers and bioindicators in the impacted zone (IZ) had sensitive response largely to the chemical stress (eutrophic indicators) and also partially to physical habitat quality, compared to the those in the control zone.
Abstract
The objectives of the study were to evaluate the aquatic environment of an urban stream using various ecological parameters of biological biomarkers, physical habitat quality, and chemical water quality and to develop a "Multimetric Eco-Model" (Mm-E Model) for the ecosystem evaluations. For the applications of the Mm-E model, three zones including the control zone (CZ) of headwaters, transition zone (TZ) of mid-stream and the impacted zone (IZ) of downstream were designated and analyzed the seasonal variations of the model values. The biomarkers of DNA, based on the comet assay approach of single-cell gel electrophoresis (SCGE), were analyzed using the blood samples of Zacco platypus as a target species, and the parameters were used tail moment, tail DNA(%) and tail length (㎛) in the bioassay. The damages of DNA were evident in the impacted zone, but not in the control zone. The condition factor (CF) as key indicators of the population evaluation indicator was analyzed along with the weight-length relation and individual abnormality. The four metrics of Qualitative Habitat Evaluation Index (QHEI) were added for the evaluations of physical habitat. In addition, the parameters of chemical water quality were used as eutrophic indicators of nitrogen (N) and phosphorus (P), chemical oxygen demand (COD), and conductivity. Overall, our results suggested that attributes of biomarkers and bioindicators in the impacted zone (IZ) had sensitive response largely to the chemical stress (eutrophic indicators) and also partially to physical habitat quality, compared to the those in the control zone.
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