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流域干扰和河流对循环的累积影响:环境管理人员的案例研究和建议
M Amyot1, F Bilodeau2, A Tremblay2
1GRIL, Département de Sciences Biologiques, Université de Montréal, 1375 Thérèse-Lavoie-Roux Ave., Montréal, QC, H2V 0B3, Canada. m.amyot@umontreal.ca.
Environmental management
|May 22, 2024
概括
河流运行 (ROR) 发电厂可以暂时增加甲基 (MeHg) 在鱼类食物网中,特别是在受干扰的流域. 仔细监测和考虑流域影响对于ROR发展至关重要.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 水生生态学 水生生态学
背景情况:
- 河流 (ROR) 水力发电厂在全球范围内很常见,其假设的环境影响有限,特别是在甲基 (MeHg) 污染方面.
- 流域干扰与ROR水建设相结合,可能会使小河的环境管理复杂化.
- 在ROR系统中, (Hg) 甲基化和随后的MeHg食物网污染尚未完全理解.
研究的目的:
- 调查ROR植物对鱼类食物网中的甲基 (MeHg) 积累的影响.
- 确定在ROR开发的河流系统中MeHg生产和积累的驱动因素.
- 为未来ROR项目的环境监测和管理提供建议.
主要方法:
- 在加拿大圣莫里斯河上进行了一项多年的案例研究,该研究是在两座ROR工厂建设后进行的.
- 分析了环境条件, (Hg) 种类和微生物群落.
- 对鱼类的MeHg度进行了不同食物营养水平的监测.
主要成果:
- 在ROR构建后观察到捕食鱼MeHg积累的意外,暂时的增加.
- 盆地作为沉积盆地Hg和有机物质从一个被破坏的流域 (森林火灾,伐木).
- 新鲜有机碳推动了微生物的MeHg生产,环境条件比Hg的存在更为关键.
结论:
- ROR工厂可能会导致暂时的 (大约. 12年) 增加了食物网MeHg,当建在受干扰的流域.
- 有机碳的降解驱动了MeHg在食物网基础上的积累,而热带转移解释了顶级变化.
- 对于ROR开发,建议使用具有高时间分辨率的环境监测和考虑流域干扰.
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