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首页> 外文期刊>Environmental toxicology and chemistry >Long-term And Acute Effects Of Zinc Contamination Of A Stream Onfish Mortality And Physiology
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Long-term And Acute Effects Of Zinc Contamination Of A Stream Onfish Mortality And Physiology

机译：溪流锌污染对鱼类死亡率和生理的长期和急性影响

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A section of the Upper Enoree River in South Carolina, USA, was contaminated with chemical waste in 1985, and high concentrations of zinc persist decades later. In this study, we examined the zinc concentrations in the water, the accumulation of zinc in a variety of fish tissues, the effects of the contaminated water on fish sperm motility in vitro, and the mortality rates of introduced fish. Zinc concentrations in the water samples collected from six sites decreased as distance from the spill site increased, ranging from 7.3 to 0.34 mg/L (p < 0.001). The zinc concentrations of tissues from native fish were highest in liver (mean across sites of 110 ppm/g tissue) and gills (77.4 ppm/g tissue), followed by gonads (30.7 ppm/g tissue) and muscle (6.9 ppm/g tissue) (p < 0.001). The duration of fast motility of Salmo trutta sperm was significantly diminished in sperm activated in samples from the contaminated stream compared with the control stream (p < 0.05). To further evaluate the ability of fish to survive at the sites with different zinc concentrations, groups of Gambusia holbrooki were placed in traps at a reference site (uncontaminated local tributary), and three sites along the contaminated stream. Rapid mortality was observed in the two sites closest to the spill, including one site in which native fish had been found. The introduced G. holbrooki expressed higher zinc concentration in gills than gonads or muscle (p < 0.001), and water zinc concentration significantly affected fish mortality (p < 0.001). The results from these experiments indicate that zinc contamination of streams can have sublethal effects on populations and physiology of fish that are able to survive in the contaminated water.
机译：1985年，美国南卡罗来纳州上恩诺里河的一部分被化学废物污染，数十年后，高浓度的锌持续存在。在这项研究中，我们检查了水中的锌浓度，各种鱼组织中锌的积累，污水在体外对鱼精子活力的影响以及引入鱼的死亡率。随着与溢出地点距离的增加，从六个地点采集的水样中的锌浓度降低，范围从7.3到0.34 mg / L（p <0.001）。原生鱼组织中的锌浓度最高的是肝脏（平均水平为110 ppm / g组织）和g（77.4 ppm / g组织），其次是性腺（30.7 ppm / g组织）和肌肉（6.9 ppm / g）组织）（p <0.001）。与污染水流相比，受污染水流中样本中激活的精子中鲑鱼（Salmo trutta）精子的快速运动持续时间显着减少（p <0.05）。为了进一步评估鱼在锌含量不同的地点生存的能力，将群Gambusia holbrooki放在参考地点（未受污染的当地支流）的陷阱中，以及沿污染河流的三个地点。在离泄漏点最近的两个地点观察到了快速死亡，其中一个地点发现了本地鱼类。引入的荷氏霍乱弧菌在g中的锌浓度高于性腺或肌肉（p <0.001），水锌浓度显着影响鱼类死亡率（p <0.001）。这些实验的结果表明，溪流中的锌污染可能会对在污染水中生存的鱼类的种群和生理产生亚致死作用。

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