Changes in fish species composition after fishway improvement in Songrim weir, Yeongok stream

Yun, Young-Jin; Kim, Ji Yoon; Kim, Hye-Jin; Bae, Dae-Yeol; Park, Gu Seong; Nam, Chang Dong; Lim, Kyung Hun; Lee, Moonyong; Lee, Seongyong; Moon, Kyeong-Do; Lee, Eui-Haeng; An, Kwang-Guk

doi:10.11626/kjeb.2021.39.2.195

Cited by 3 publications

(1 citation statement)

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“…서 론 우리나라의 하천은 산지가 많은 지형 특성상 하천의 경사가 급한 편이며, 몬순 강우 특성에 의한 계절 강우의 분포가 일정 하지 않아 수자원의 이수와 치수에 어려움을 겪었다. 1) 이에 1970년대 이후 이수와 치수의 목적으로 하천정비사업이 활발 하게 진행되었다. 이 과정에서 보(weir)와 댐과 같은 횡단구조 물이 많이 건설되었는데, 이는 농업용수와 식수를 확보하기 위한 필수 불가결한 요소 중 하나로 간주되었다.…”

Section: 최혜지ㆍ기서진ㆍ이혁제ㆍ배대열ㆍ안광국ㆍ김지윤ㆍ진상현ㆍ조민재unclassified

Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream

Choi,

Ki,

Lee

et al. 2023

J Korean Soc Environ Eng

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The main objectives of this study were to evaluate biological integrity analysis and longitudinal connectivity assessment in Tan Stream. The research included the analysis of chemical water quality, ecological health assessment based on fish, and a comparison of aquatic ecosystem health before and after restoration, following the removal of two weirs (Baekgung weir and Baekhyeon weir) among the nine weirs with five fishways. Additionally, an assessment of longitudinal connectivity is being conducted. Dissolved oxygen (DO), biological oxygen demand (BOD), total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), and suspended solids (SS) concentrations were not high based on the criteria of the Ministry of Environment, Korea. The ecological health assessment based on fish showed an average health grade of “Fair (C)”, indicating a partial deterioration of ecological health, with Zacco platypus as the dominant species. The results of the regression analysis showed that there was no significant correlation between water quality and ecological health (p > 0.05). After the removal of Baekgung weir, the health of the aquatic ecosystem (FAI) improved slightly, increasing from “50” to “56.25”. And after the removal of Baekhyeon weir, the value remained the same as before the removal (“56.25”). However, it was found that the overall improvement effect on the entire Tan Stream was minimal. The evaluation of longitudinal connectivity revealed, three continuities, two partial continuities and two discontinuities at the artificial weir unit level, while at the stream unit level, it was evaluated as “continuous (52.8%)”. Further comprehensive research is needed to investigate the potential impact of artificial structures on the integrity of the aquatic ecosystem.

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Section: 최혜지ㆍ기서진ㆍ이혁제ㆍ배대열ㆍ안광국ㆍ김지윤ㆍ진상현ㆍ조민재unclassified

Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream

Choi,

Ki,

Lee

et al. 2023

J Korean Soc Environ Eng

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Fish Community Characteristics and the Effects of Water Quality on River Health in the Anyang Stream, Korea1a

Joo,

2024

Korean J. Environ. Ecol.

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Spatiotemporal Variation Analyses of Water Quality, Fish Ecological Guilds, and the Longitudinal Connectivity in Musim Stream

Cho,

Kim,

Jin

et al. 2024

J Korean Soc Environ Eng

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The main objectives of this study were to analyze the spatiotemporal variations of water quality, fish ecological guilds and longitudinal connectivity in the weirs of Musim Stream. Fish were collected at 44 sites during spring and fall seasons for the analysis of trophic guilds, tolerance guilds, and the ecological stream health, based on FAI model. Total 33 species were observed in the stream and the dominant species were Zacco platypus and Squalidus qracilis majimae. Mean values of BOD and COD, as an indicator of organic matter pollution, showed high in the drought spring and low in fall (post-monsoon season). Also, TP showed same pattern with the BOD and COD pattern. The hierarchical clustering, based on the fish compositions, classified as three groups (up-stream, mid-stream and the down-stream). Based on the NMDS (Non-metric Multidimensional Scaling) analysis of fish abundance, high similarity was observed between S1-S5 sites, which were consistent with the results of hierarchical cluster analysis. Fish ecological guilds in the upper stream showed a high similarity between the insectivore and sensitive species, while in the middle and lower reaches, high similarity was found between the omnivore and intermediate species. Evaluations of longitudinal connectivity, based on the structural and hydrological characteristics of the weir, indicated all disconnections by the weirs, except for S15, in the spring. Stream ecological health, based on the FAI model, was significantly (p < 0.05, n=37) influenced by the height of overflow (Hu1). Overall, our study suggests that the longitudinal connectivity, based on the weir structures, flow regime and fish swimming capacity, were blocked off by the weirs in the stream. The results provide valuable insights for securing river management strategies and served as the fundamental data for stream restoration in the future.

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Changes in fish species composition after fishway improvement in Songrim weir, Yeongok stream

Cited by 3 publications

References 0 publications

Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream

Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream

Fish Community Characteristics and the Effects of Water Quality on River Health in the Anyang Stream, Korea<sup>1a</sup>

Spatiotemporal Variation Analyses of Water Quality, Fish Ecological Guilds, and the Longitudinal Connectivity in Musim Stream

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