U.S. Geological Survey, 87 State St., Montpelier, VT, USA.
U.S. Geological Survey, 8505 Research Way, Middleton, WI 53562, USA.
Environ Pollut. 2014 Sep;192:104-12. doi: 10.1016/j.envpol.2014.05.003. Epub 2014 Jun 6.
We compare total mercury (HgT) loading and methylmercury (MeHg) accumulation in streams and lakes from an urbanized area (Boston, Massachusetts) to rural regions of southern New Hampshire and Maine. The maximum HgT loading, as indicated by HgT atmospheric deposition, HgT emissions, and sediment HgT concentrations, did not coincide with maximum MeHg concentrations in fish. Urbanized ecosystems were areas of high HgT loading but had low MeHg concentrations in fish. Controls on MeHg production and accumulation appeared to be related primarily to HgT loading in undeveloped areas, while ecosystem sensitivity to MeHg formation appeared to be more important in regulating accumulation of MeHg in the urban area.
我们比较了城市化地区（马萨诸塞州波士顿）和新罕布什尔州和缅因州南部农村地区溪流和湖泊中的总汞（HgT）负荷和甲基汞（MeHg）积累。HgT 大气沉积、HgT 排放和沉积物 HgT 浓度表明的最大 HgT 负荷与鱼类中最大 MeHg 浓度并不吻合。城市化生态系统是 HgT 负荷高的地区，但鱼类中的 MeHg 浓度较低。MeHg 生成和积累的控制因素似乎主要与未开发地区的 HgT 负荷有关，而生态系统对 MeHg 形成的敏感性似乎对调节城市地区 MeHg 积累更为重要。
