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

Hyeji Choi, Seo Jin Ki, Hyuk Je Lee, Dae-Yeul Bae, Kwang-Guk An, Ji Yoon Kim, Sang-Hyeon Jin, Min Jae Cho
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Abstract

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.
基于鱼类多度量模型的滩溪纵向连通性评价及化学水质和生物完整性分析
本研究的主要目的是评价谭河的生物完整性分析和纵向连通性评价。此次研究包括化学水质分析、以鱼类为对象的生态健康评价、拆除5个渔道的9个渔场中的2个(白公渔场和白岘渔场)后,恢复前后的水生态系统健康对比等。此外,正在对纵向连通性进行评估。根据环境部的标准,溶解氧(DO)、生物需氧量(BOD)、总有机碳(TOC)、总氮(TN)、总磷(TP)、悬浮物(SS)的浓度都不高。鱼类生态健康评价的平均健康等级为“一般(C)”,表明生态健康状况部分恶化,Zacco鸭嘴兽</i>作为优势种。回归分析结果表明,水质与生态健康之间不存在显著相关关系(<i>p</i>比;0.05)。白宫堰去除后,水体生态系统健康度(FAI)略有改善,从“50”提高到“56.25”。白岘堰拆除后,该数值与拆除前相同(56.25)。然而,我们发现对整个滩溪的整体改善效果微乎其微。纵向连通性评价在人工堰单元水平上表现为3个连续、2个部分连续和2个不连续,而在河流单元水平上表现为“连续”(52.8%)。人工结构对水生生态系统完整性的潜在影响有待进一步的综合研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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