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连接功能性息地和鱼群动态建模,以改善河流康复规划和评估
David Farò1, Christian Wolter1
1Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Müggelseedamm 310, 12587 Berlin, Germany.
Journal of environmental management
|September 7, 2024
概括
河流康复措施可以促进鱼类种群,但息地可访问性是关键. 改善连接和育儿息地显著增加了鱼类的招募潜力,例如灰和幼等物种.
科学领域:
- 河流生态 河流生态
- 鱼群动态 鱼群动态
- 息地恢复 息地恢复
背景情况:
- 河流内息地增强是改善河流生态条件的常见做法,重点是鱼产卵和幼发育.
- 对息地改善对鱼类招募和种群的影响缺乏预测模型.
- 水力发电的影响可能会降低河流息地,影响鱼群.
研究的目的:
- 评估河流康复措施对鱼类招募潜力的影响,使用空间显式人口动态模型.
- 评估绕道通道和岛屿侧通道系统在受水力发电影响的河段的有效性.
- 分析增加功能育儿息地可用性对目标鱼类物种的影响.
主要方法:
- 开发和应用一个空间显式的人口动态模型,整合功能性息地动态.
- 评估两项实施的康复措施 (绕道通道,岛屿侧通道系统).
- 模拟两个替代场景,增强功能育儿息地的可用性 (66.8%和95.3%).
主要成果:
- 预计改善的息地条件将使目标物种平均每公增加14.9个 (5.6公斤/公).
- 可用育儿息地的有限可用性为所有研究的物种带来了重要的招募瓶.
- 功能连接性增加的替代情景导致平均密度为17.9和25.8个/ha,具有特定物种的反应.
结论:
- 建模方法适用于评估和规划河流恢复措施.
- 优化鱼类招募潜力需要考虑息地比例和功能连接.
- 对于产卵到育儿园息地比率的特定物种反应强调了需要量身定制的恢复策略.
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