Exposure of insects and insectivorous birds to metals and other elements from abandoned mine tailings in three Summit County drainages, Colorado
Exposure of insects and insectivorous birds to metals and other elements from abandoned mine tailings in three Summit County drainages, Colorado
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DOI：
10.1007/s10661-008-0346-y
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发表时间：
2009-06-01
影响因子：
3
通讯作者：
Hageman, Phillip L.
中科院分区：
文献类型：
--
作者：
Custer, Christine M.;Yang, Chi;Hageman, Phillip L.
在Summit Co.的三个具有不同地球化学和采矿历史的排水系统中，测量了昆虫和食虫鸟类组织中31种金属、类金属和其他元素的浓度，科罗拉多，2003年，2004年，2005年。在昆虫样本中，与采矿影响区以上和以下的地区相比，在所有年份分析的所有25种元素在受采矿影响区的蛇溪和鹿溪都有所增加。这种元素的分布是根据已知或预期的沉积物污染而预测的，这些沉积物污染来自这些排水系统中的废弃尾矿。鸟类肝脏组织中的元素浓度与昆虫中的水平一致，也就是说，与上游和下游位置相比，存在尾矿的中间排水区的浓度较高;然而，这些差异并不总是具有统计学差异。除了少数元素外，肝脏组织缺乏统计学显著差异，这是由于样本量相对较小，并且因为这些元素中的许多是必需的，因此受到鸟类体内平衡过程的良好调节。大多数元素的背景浓度在鸟类肝脏组织中，除了铅，这是升高的中间排水网站的水平，其中δ-氨基乙酰丙酸酯酶活性被抑制在其他采矿点在科罗拉多。然而，铅暴露并未达到毒性水平。粪便样本并不能很好地表明鸟类摄入了什么元素，并可能暴露于什么元素。
Concentrations of 31 metals, metalloids, and other elements were measured in insects and insectivorous bird tissues from three drainages with different geochemistry and mining histories in Summit Co., Colorado, in 2003, 2004, and 2005. In insect samples, all 25 elements that were analyzed in all years increased in both Snake and Deer Creeks in the mining impacted areas compared to areas above and below the mining impacted areas. This distribution of elements was predicted from known or expected sediment contamination resulting from abandoned mine tailings in those drainages. Element concentrations in avian liver tissues were in concordance with levels in insects, that is with concentrations higher in mid-drainage areas where mine tailings were present compared to both upstream and downstream locations; these differences were not always statistically different, however. The lack of statistically significant differences in liver tissues, except for a few elements, was due to relatively small sample sizes and because many of these elements are essential and therefore well regulated by the bird's homeostatic processes. Most elements were at background concentrations in avian liver tissue except for Pb which was elevated at mid-drainage sites to levels where delta-aminolevulinic acid dehydratase activity was inhibited at other mining sites in Colorado. Lead exposure, however, was not at toxic levels. Fecal samples were not a good indication of what elements birds ingested and were potentially exposed to.