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http://dx.doi.org/10.11626/KJEB.2018.36.3.400

Changes in Aquatic Insect Community Structure in Wonju Stream based on a Comparison of Previous Studies  

Han, Jung Soo (Department of Biological Science, College of Science & Engineering, Sangji University)
Choi, Jun Kil (Department of Biological Science, College of Science & Engineering, Sangji University)
Won, Kyung Ho (Wonju City Hall)
Lee, Hwang Goo (Department of Biological Science, College of Science & Engineering, Sangji University)
Publication Information
Korean Journal of Environmental Biology / v.36, no.3, 2018 , pp. 400-411 More about this Journal
Abstract
This study was a survey of the Wonju stream in Wonju city from May 2015 to September 2016. A total of three sites were selected from the upstream area Gwanseol-dong to the downstream area Hojeo-myeon. Physicochemical analysis, aquatic insect changes, cluster analysis, functional group analysis, rarefaction curve, and statistical analysis were compared between 2004 and 2016. A total of 19 species (38.78%) in 2004 and 22 species (36.67%) in 2016 were analyzed, with the largest number belonging to ephemeroptera. The individual ratio ranged from 27,759.2 (ind. $m^{-2}$, 84.30%) in 2004 to 4,573.2 (ind. $m^{-2}$, 41.64%) in 2016, with the highest number involving diptera. As a result of the community analysis, significant differences were detected in the indices of dominance, diversity, evenness, and richness in 2004 and 2016 (p<0.05). Burrowers of the habitat orientation groups showed the greatest variation with an average of -68.00% (${\pm}2.15$) and the collector-gatherers of the functional feeding groups showed the highest variation of -40.12% (${\pm}1.77$). The rarefaction curve analysis suggested that the species was the poorest in the midstream regions in 2004 and 2016. Physical factors and water quality showed a significant correlation with diversity index, evenness index, and the number of individuals. MDS analysis of the similarity of upstream and downstream regions was high in 2004, and low in 2016. The differences were attributed to physicochemical changes such as increase in flow velocity due to improvement of small dams and changes in bottom structure.
Keywords
ecologically restored stream; small dam improvement; physicochemical change; multidimensional scaling;
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