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首页> 外文期刊>Archives of Environmental Contamination and Toxicology >Chronic Toxicity of Surface Water from a Canadian Oil Sands End Pit Lake to the Freshwater Invertebrates Chironomus dilutus and Ceriodaphnia dubia
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Chronic Toxicity of Surface Water from a Canadian Oil Sands End Pit Lake to the Freshwater Invertebrates Chironomus dilutus and Ceriodaphnia dubia

机译：从加拿大油砂的慢性毒性从加拿大油砂末端坑湖到淡水中的互脊椎动物互疏魔和Ceriodaphnia dubia

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Permanent reclamation of tailings generated by surface mining in the Canadian oil sands may be achieved through the creation of end pit lakes (EPLs) in which tailings are stored in mined-out pits and capped with water. However, these tailings contain high concentrations of dissolved organics, metals, and salts, and thus surface water quality of EPLs is a significant concern. This is the first study to investigate the chronic toxicity of surface water from Base Mine Lake (BML), the Canadian oil sands first large-scale EPL, to aquatic invertebrates that play a vital role in the early development of aquatic ecosystems (Chironomus dilutus and Ceriodaphnia dubia). After exposure of C. dilutus larvae for 23 days and C. dubia neonates for 8 days, no mortality was observed in any treatment with whole BML surface water. However, the emergence of C. dilutus adults was delayed by nearly 1 week, and their survival was significantly reduced (36%) compared with the controls. Reproduction (fecundity) of C. dubia was reduced by 20% after exposure to 2014 BML surface water; however, the effect was not observed after exposure to BML surface water collected a year later in 2015. Despite some adverse effects, the results of this study indicate that BML surface water quality is improving over time and is able to support certain salt-tolerant aquatic organisms. Because salinity within BML will persist for decades without manual intervention, the ecological development of the lake will likely resemble that of a brackish or estuarine ecosystem with reduced diversity.
机译：通过在加拿大油砂中产生表面挖掘产生的尾矿的永久填充可以通过创建尾部坑湖（EPLS）来实现，其中尾矿储存在挖掘坑中并用水封顶。然而，这些尾矿含有高浓度的溶解有机物，金属和盐，因此EPLS的表面水质是一个重要的问题。这是研究从基础矿山（BML）的地表水的慢性毒性，加拿大油砂的第一个大型EPL，到水生无脊椎动物在水生生态系统的早期发展中发挥至关重要作用的研究，这是一种研究，这在水生生态系统（互疏忽Ceriodaphnia dubia）。暴露于稀释物幼虫23天和C. Dubia Neonates 8天后，在全部BML地表水处理中没有观察到死亡率。然而，与对照相比，C.稀释物成人的出​​现近1周延迟了近1周，其存活率显着降低（36％）。在暴露于2014 BML地表水后，C. Dubia的繁殖（繁殖力）降低了20％;然而，在2015年晚些时候收集的BML地表水暴露后未观察到该效果。尽管存在一些不利影响，但本研究结果表明，BML地表水质随着时间的推移而改善并且能够支持某些耐盐水生生物。因为在没有手动干预的情况下，BML内的盐度将持续数十年，因此湖的生态发展可能类似于具有减少多样性的咸水或河口生态系统。

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