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首页> 外文期刊>Environmental toxicology and chemistry >The Single and Combined Effects of Wildfire Runoff and Sediment‐Bound Copper on the Freshwater Amphipod Hyalella azteca
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The Single and Combined Effects of Wildfire Runoff and Sediment‐Bound Copper on the Freshwater Amphipod Hyalella azteca

机译：野火径流和沉积铜对淡水Amphipod Hyalella Azteca的单一和综合影响

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The frequency of wildfire is expected to increase with time as a function of climate change. Recent studies in our laboratory have demonstrated that pyrogenic polycyclic aromatic hydrocarbons can cause greater-than-additive effects inHyalella aztecain the presence of low concentrations of Cu. We hypothesized that freshwater animals inhabiting Cu-contaminated sites, such as those in the vicinity of Cu mines, may be vulnerable to nonadditive toxicity from contaminants released by wildfires. To investigate the interaction between Cu and water conditioned by burnt wood ash (fire extract), we exposedH. aztecafor 14 d to binary mixtures of 225 mg/kg Cu-enriched artificial sediment (225 mg Cu/kg) and a fire extract dilution series (12.5, 25, 50, 75, and 100%). All binary mixtures of Cu-enriched sediment and fire extract resulted in complete mortality with the exception of Cu-enriched sediment + 12.5% fire extract. The combination of Cu-enriched sediment with 12.5% fire extract had a more-than-additive effect on survival and tissue Cu concentration, but there was no reduction in growth or acetylcholinesterase activity compared to the 225 mg/kg Cu-contaminated sediment or fire extract control, respectively. Acetylcholinesterase activity was significantly reduced in amphipods exposed to fire extract, but the presence of Cu did not exacerbate this effect. The results suggest that Cu-contaminated water bodies that receive runoff from wildfires are at risk of enhanced toxicity.Environ Toxicol Chem2020;39:1988-1997. (c) 2020 SETAC
机译：随着气候变化的函数，预计野火的频率将随着时间的推移而增加。我们实验室的最近的研究表明，热源多环芳烃可以引起含有大于添加剂效果的含有低浓度的Cu的存在。我们假设谷物谷物栖息地的淡水动物如Cu矿山附近，可能易受野火释放的污染物的非吸收毒性。为了探讨Cu和水通过烧伤的木灰（防火液）之间的相互作用，我们露出。 Aztecofor 14d至二元混合物的225mg / kg富铜人工沉积物（225mg Cu / kg）和火提取物稀释系列（12.5,25,50,75和100％）。除Cu富集的沉积物+ 12.5％火提取物外，所有二元混合物的所有二元混合物都导致了完全的死亡率。富含Cu的沉积物与12.5％的火提取物的组合对存活和组织Cu浓度具有较高的效果，但与225mg / kg Cu污染的沉积物或火相比，生长或乙酰胆碱酯酶活性没有降低分别提取控制。乙酰胆碱酯酶活性在暴露于火提取物中的两窝中显着降低，但Cu的存在不会加剧这种效果。结果表明，从野火中接受径流的Cu污染水体受到增强毒性的风险。紫罗兰毒素Chem2020; 39：1988-1997。 （c）2020 Setac

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