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http://dx.doi.org/10.11626/KJEB.2021.39.1.108

The relationship between the population characteristics and physical habitat of Manchurian trout(Brachymystax lenok tsinlingensis) in the Geybangcheon stream  

Ko, Min Seop (Department of Biological Science, College of Science & Engineering, Sangji University)
Choi, Jun Kil (Department of Biological Science, College of Science & Engineering, Sangji University)
Lee, Hwang Goo (Department of Biological Science, College of Science & Engineering, Sangji University)
Publication Information
Korean Journal of Environmental Biology / v.39, no.1, 2021 , pp. 108-118 More about this Journal
Abstract
The purpose of this study was to provide baseline ecological data for the conservation of the Manchurian trout habitat through the investigation of the growth status of Brachymystax lenok tsinlingensis, and Pearson's correlation analysis (PCA) between the B. lenok tsinlingensis population and the use of the land around Gyebangcheon stream. Sampling was conducted twice in July, September, and October 2018. During the July and September surveys, 882 individuals belonging to 13 species from six families were collected. The dominant species was Rhynchocypris kumgangensis and the subdominant species was Zacco koreanus. The total number of B. lenok tsinlingensis collected was 99. The results of the length-weight relationship in the B. lenok tsinlingensis population were analyzed with a regression coefficient b value of 3.1272 and a condition factor (k) value of 0.0006. Therefore, the growth condition of B. lenok tsinlingensis was regarded as fairly good. The QHEI(Qualitative habitat evaluation index) value in the B. lenok tsinlingensis habitat was 119.5(±0.5)-153.5(±0.5), indicating optimal-suboptimal conditions. As a result of the HIS (Habitat suitability index) analysis, it was confirmed that the optimal habitat for B. lenok tsinlingensis was 0.45-0.55m and >1 m in water depth, 0.55-0.65 m s-1 in water velocity, and boulder in the substrate. The ratio of the land use in this study site was analyzed as 66.26-96.31% for forest and grassland areas, 0.00-23.79% for agricultural areas, 0.00-4.19% for urbanized areas, and 3.69-8.87% for others. Correlation analysis of the number of B. lenok tsinlingensis and various factors revealed statistically significant correlations between QHEI and forest and grassland areas, agricultural areas, and urbanized areas.
Keywords
Brachymystax lenok tsinlingensis; QHEI; HSI; land use; Geybang stream;
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