M. De-Miguel-Gallo, F. Martínez‐Capel, R. Muñoz‐Mas, S. Aihara, Y. Matsuzawa, Shinji Fukuda
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引用次数: 7
摘要
东京泉源溪流是多种水生物种的重要栖息地,而城市化和外来入侵物种的引入正威胁着这些水生生态系统的可持续性。本研究应用环境流量分析系统(SEFA)在东京的一条小城市河流中评估濒危淡水鱼Lefua echigonia适宜栖息地的动态(Jordan and Richardson 1907)。建立了一套基于水深、流速和基质的生境适宜性曲线(hsc)来评价生境适宜性。生境评价结果表明,面积加权适宜性(AWS)在0.02 m3/s时达到最大值,接近目标河基流;高流量时,观察到AWS逐渐降低。连续41个月的时间分布表明,平均1 - 7月是毛毛瓢虫成虫最佳生境,8 - 12月是毛毛瓢虫最差生境。本研究为河流生境分析提供了信息和工具,有助于管理者保护这一水生物种,并优先采取行动进一步恢复城市河流,并以echigonia为例进行了研究。
Habitat evaluation for the endangered fish species Lefua echigonia in the Yagawa River, Japan
Abstract Spring-fed streams in Tokyo are important habitats for various aquatic species, whereas urbanization as well as introduction of invasive species is threatening the sustainability of such aquatic ecosystems. This study applies the System for Environmental Flow Analysis (SEFA) in a small urban river in Tokyo to assess the dynamics of the suitable habitats for the endangered freshwater fish Lefua echigonia (Jordan and Richardson 1907). A set of Habitat Suitability Curves (HSCs) for water depth, velocity and substrate was developed to evaluate the suitable habitats. The habitat assessment indicated that the Area Weighted Suitability (AWS) reached the maximum at 0.02 m3/s, which is close to the base flow of the target river; a gradual decrease in AWS was observed for higher flows. The temporal distribution of AWS, during forty-one consecutive months, showed that, on average, the best habitat conditions for adult L. echigonia occur during the period between January and July, whereas the worst situation occurs during the period between August and December. This work presents information and tools for instream habitat analysis that should help managers to conserve this aquatic species and prioritize actions to further rehabilitate urban rivers, using L. echigonia as a case study.