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http://dx.doi.org/10.11626/KJEB.2022.40.2.172

Ecological health assessment of Yangjaecheon and Yeouicheon using biotic index and water quality  

Jin Hyo Lee (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health)
Hyeon Han (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health)
Jun Yeon Lee (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health)
Young Seop Cha (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health)
Seog Ju Cho (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health)
Publication Information
Korean Journal of Environmental Biology / v.40, no.2, 2022 , pp. 172-186 More about this Journal
Abstract
Benthic macroinvertebrates are important ecological and environmental indicators as primary or secondary consumers, and therefore are widely used in the evaluation of aquatic environments. However, there are no comprehensive river ecosystem monitoring surveys that link the major physicochemical water quality items with benthic macroinvertebrates in urban streams. Therefore, this study investigated the distribution characteristics of benthic macroinvertebrates and physicochemical water quality items (17 items) in Yangjaecheon and Yeouicheon from 2019 to 2020. At the same time, by applying Spearman's rank correlation analysis and nonmetric multidimensional scaling (nMDS) analysis in the water quality data and biotic index, we tried to provide basic data for diagnosing the current status of river ecosystems in major urban rivers in Seoul. Based on the study results, a total of 39 species and 3,787 individuals were identified in Yangjaecheon, the water quality(based on BOD, TOC, and TP) of Yangjaecheon was higher than Grade Ib(good), and the BMI using benthic macroinvertebrates appeared as Grade C(normal) at all the sites. In Yeouicheon, a total of 51 species and 4,199 individuals were identified, the water quality(based on BOD, TOC, TP) was higher than Grade Ib(good) similar to Yangjaecheon, and the BMI of both Upstream and Saewon bridge was Grade B(good), while Yeoui bridge was Grade C(normal). Overall, analysis results for the distribution of benthic macroinvertebrates by a nonmetric multidimensional scaling method showed no significant difference between the two streams (p=0.1491). Also, significant environmental variables related to benthic macroinvertebrates distribution were determined as water temperature and DO. On the other hand, the results of the correlation analysis between biotic index and major water quality items confirmed that R1 and BMI could be used for on-site urban river water quality evaluation.
Keywords
benthic macroinvertebrates biotic index; correlation analysis; nMDS; water quality grade;
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