Southeastern Alaska is a remote coastal-maritime ecosystem that is experiencing increased deposition of mercury (Hg) as well as rapid glacier loss. Here we present the results of the first reported survey of total and methyl Hg (MeHg) concentrations in regional streams and biota. Overall, streams draining large wetland areas had higher Hg concentrations in water, mayflies, and juvenile salmon than those from glacially-influenced or recently deglaciated watersheds. Filtered MeHg was positively correlated with wetland abundance. Aqueous Hg occurred predominantly in the particulate fraction of glacier streams but in the filtered fraction of wetland-rich streams. Colonization by anadromous salmon in both glacier and wetland-rich streams may be contributing additional marine-derived Hg. The spatial distribution of Hg in the range of streams presented here shows that watersheds are variably, yet fairly predictably, sensitive to atmospheric and marine inputs of Hg.

译文

:阿拉斯加东南部是一个偏远的沿海海洋生态系统,其汞(Hg)沉积增加,冰川迅速流失。在这里,我们介绍了首次报告的区域溪流和生物区系中的总汞和甲基汞(MeHg)浓度的调查结果。总体而言,排泄大片湿地的河流中的水,g和幼鲑中的Hg含量高于受冰川影响或最近冰川消融的集水区中的汞含量。过滤后的甲基汞与湿地丰度呈正相关。汞水主要发生在冰川流的颗粒部分中,但在富湿地流的过滤部分中发生。在冰川和湿地丰富的溪流中,鲑鱼定居可能会增加来自海洋的汞。在此介绍的水流范围内,Hg的空间分布表明,分水岭对大气和海洋中的Hg输入具有可变性,但相当可预见性。

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