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Preliminary Ecological Environmental Assessments of a Brooklet in Jeungchon

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2012, 21(6), pp.841-857
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering

JEONGHO HAN 1 Kwang Guk An ORD ID 1

1충남대학교

Accredited

ABSTRACT

Preliminary ecological environmental assessments including physico-chemical constituents, water quality, fish fauna analysis, physical habitat health, and ecological health assessment were conducted as a primary step for Jeungchon micro-habitat ecosystem restoration in 2012. Water chemistry analysis of conductivity, dissolved oxygen, chlorophyll-a and etc. indicated that there were no significant differences(p < 0.05) among 6 sites between the headwaters and downstream. Multi-metric model analysis of Qualitative Habitat Evaluation Index(QHEI) showed that brooklets were at “good condition” as a mean QHEI of 158.7(n = 6) and the longitudinal differences of the model values between the sites were minor(QHEI range: 153 - 165). Total fish species and the number of individuals were 12 and 481, respectively, and dominant species were Zacco platypus(49.5%) and Zacco koreanus(36.8%). Tolerance guild analysis showed that the proportion of sensitive species(SS) had a negative linear function[SS = 86.35 - 0.31(DH); R2 = 0.892, p < 0.01] with a distance from the headwaters, while the proportion of tolerant species(TS) had a positive linear function(R2 = 0.950, F = 90.28, p < 0.001) with the distance. Trophic feeding guild analysis showed that the proportion of insectivore species(IS) had a negative linear function(R2 = 0.934, p < 0.01) with a distance from the headwaters, while the proportion of omnivore species(OS) had a positive linear function(R2 = 0.958, p < 0.001) with the distance. Index of Biological Integrity(IBI) model, based on fish assemblages, showed a “fair condition” as a mean IBI of 23(n = 6), and there was a distinct differences of ecological health between the headwaters(S1 = 30; “good condition”) and the downstreams(S6 = 14; “poor condition”). Overall, the preliminary environmental impact assessments suggest that water quality, physical habitat conditions(QHEI model), and ecological health(IBI model) were maintained well, even if the state was not an excellent conditions.

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