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首页> 外文期刊>Environmental Science & Technology >Beaver Ponds Increase Methylmercury Concentrations in Canadian Shield Streams along Vegetation and Pond-Age Gradients
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Beaver Ponds Increase Methylmercury Concentrations in Canadian Shield Streams along Vegetation and Pond-Age Gradients

机译：海狸池塘沿植被和池塘年龄梯度增加加拿大盾构溪流中的甲基汞浓度

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摘要

Beaver impoundments flood forested areas and may be important production sites for methylmercury (MeHg) because of the resulting enhanced microbial activity and oxygen depletion. The influence of 17 beaver impoundments on streamwater chemistry [total mercury (THg), MeHg, nutrients, cations, and anions)] was investigated by sampling sites located along vegetation and pond-age gradients in southwestern Quebec (Canada). Recently inundated beaver ponds (<10 years old) and those located in coniferous watersheds had the highest MeHg concentrations (range, 0.10-4.53 ng L~(-1)) and greatest methylation efficiencies (%THg as MeHg; range, 10-74%). High heterotrophic activity likely occurred in the beaver ponds as suggested by depletions of dissolved oxygen, sulfate and nitrite-nitrate concentrations, and increases in nutrients (e.g., dissolved organic carbon, total phosphorus, and total nitrogen) in outlets compared to inlets. Acidic waters at coniferous sites may have stimulated more MeHg production than in mixed woodland regions. Lower methylation efficiencies in older ponds (>20 years old) may be due to the degradation of less labile organic matter as ponds age. Beavers actively alter watersheds by building impoundments, and our findings indicate that this landscape disturbance may be a significant source of MeHg to downstream water bodies.
机译：海狸水库充斥森林地区，由于其增强的微生物活性和氧气消耗，可能是甲基汞（MeHg）的重要生产场所。通过在魁北克西南部（加拿大）沿植被和池塘年龄梯度分布的采样点调查了17种海狸水库对河流水化学的影响[总汞（THg），MeHg，营养素，阳离子和阴离子]。最近被淹没的海狸池塘（<10岁）和位于针叶流域的那些池塘的MeHg浓度最高（范围为0.10-4.53 ng L〜（-1）），甲基化效率最高（％THg为MeHg；范围为10-74） ％）。溶解氧，硫酸盐和亚硝酸盐-硝酸盐浓度的消耗表明，海狸池塘可能发生高异养活动，并且与进口相比，出口的养分（例如溶解的有机碳，总磷和总氮）增加。针叶林地的酸性水可能比混合林地刺激了更多的甲基汞生产。在较旧的池塘（> 20年龄）中，甲基化效率较低可能是由于随着池塘年龄的增长，较不稳定的有机物会降解。海狸通过建造蓄水池积极地改变了流域，我们的发现表明，这种景观干扰可能是下游水体甲基汞的重要来源。

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  • 来源
    《Environmental Science & Technology》 |2009年第15期|5605-5611|共7页
  • 作者

    VIRGINIE ROY; MARCAMYOT; RICHARD CARIGNAN;

  • 作者单位

    Universite de Montreal, Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Depanement des sciences biologiques, C.P. 6128, Succursale Centre-Ville, Pavilion Marie-Victorin, Montreal, Quebec, Canada H3C 3J7;

    Universite de Montreal, Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Depanement des sciences biologiques, C.P. 6128, Succursale Centre-Ville, Pavilion Marie-Victorin, Montreal, Quebec, Canada H3C 3J7;

    Universite de Montreal, Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Depanement des sciences biologiques, C.P. 6128, Succursale Centre-Ville, Pavilion Marie-Victorin, Montreal, Quebec, Canada H3C 3J7;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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