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首页> 外文期刊>Environmental Science & Technology >Chemosensory Deprivation in Juvenile Coho Salmon Exposed to Dissolved Copper under Varying Water Chemistry Conditions
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Chemosensory Deprivation in Juvenile Coho Salmon Exposed to Dissolved Copper under Varying Water Chemistry Conditions

机译：在变化的水化学条件下暴露于溶解铜中的幼银大麻哈鱼的化学感觉剥夺

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Dissolved copper is an important nonpoint source pollutant in aquatic ecosystems worldwide. Copper is neurotoxic to fish and is specifically known to interfere with the normal function of the peripheral olfactory nervous system. However, the influence of water chemistry on the bioavailability and toxicity of copper to olfactory sensory neurons is not well understood. Here we used electrophysiological recordings from the olfactory epithelium of juvenile coho salmon (Oncorhynchus kisutch) to investigate the impacts of copper in freshwaters with different chemical properties. In low ionic strength artificial fresh water, a short-term (30 min) exposure to 20 μg/L dissolved copper reduced the olfactory response to a natural odorant (10~(-5) M L-serine) by 82%. Increasing water hardness (0.2-1.6 mM Ca) or alkalinity (0.2-3.2 mM HCO_3~-) only slightly diminished the inhibitory effects of copper. Moreover, the loss of olfactory function was not affected by a change in pH from 8.6 to 7.6. By contrast, olfactory capacity was partially restored by increasing dissolved organic carbon (DOC; 0.1-6.0 mg/L). Given the range of natural water quality conditions in the western United States, water hardness and alkalinity are unlikely to protect threatened or endangered salmon from the sensory neurotoxichy of copper. However, the olfactory toxicity of copper may be partially reduced in surface waters that have a high DOC content.
机译：溶解的铜是全球水生生态系统中一种重要的面源污染物。铜对鱼类有神经毒性，众所周知，铜会干扰周围嗅觉神经系统的正常功能。但是，水化学对铜对嗅觉感觉神经元的生物利用度和毒性的影响尚不清楚。在这里，我们使用了来自幼年银大麻哈鱼（Oncorhynchus kisutch）嗅上皮的电生理记录，研究了铜在具有不同化学性质的淡水中的影响。在低离子强度的人造淡水中，短期（30分钟）暴露于20μg/ L溶解的铜会使对天然气味（10〜（-5）M L-丝氨酸）的嗅觉响应降低82％。增加水的硬度（0.2-1.6 mM Ca）或碱度（0.2-3.2 mM HCO_3〜-）只会稍微减弱铜的抑制作用。而且，嗅觉功能的丧失不受pH从8.6变化到7.6的影响。相反，通过增加溶解的有机碳（DOC； 0.1-6.0 mg / L），嗅觉能力得以部分恢复。考虑到美国西部自然水质条件的范围，水的硬度和碱度不太可能保护受威胁或濒临灭绝的鲑鱼免受铜的感觉神经毒性。但是，在DOC含量高的地表水中，铜的嗅觉毒性可能会部分降低。

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