气候变化领域集成服务门户(CCPortal): Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs

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DOI	10.1007/s10533-020-00690-7
	Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs
	Gerson J.R.; Naslund L.C.; Liu Y.-T.; Hsu-Kim H.; Driscoll C.T.; Ross M.R.V.; Waters M.N.; Bernhardt E.S.
发表日期	2020
ISSN	0168-2563
起始页码	109
结束页码	122
卷号	150 期号:1
英文摘要	Coal is naturally enriched in trace elements, including mercury (Hg) and selenium (Se). Alkaline mine drainage from mountaintop mining valley fill (MTM-VF)—the dominant form of surface coal mining in Appalachia, USA—releases large quantities of Se into streams draining mined catchments, resulting in elevated bioaccumulation of Se in aquatic and riparian organisms. Yet, the release of Hg into these streams from MTM-VF has not yet been studied. We measured total Hg, methylmercury (MeHg), and Se in stream water, sediment, biofilm, cranefly larvae, and riparian spiders in alkaline streams (pH range 6.9–8.4) across a mining gradient (0–98% watershed mined) in central Appalachia. Hg concentrations ranged from below detection limit (BDL)-6.9 ng/L in unfiltered water, BDL-0.05 µg/g in bulk sediment, 0.016–0.098 µg/g in biofilm, 0.038–0.11 µg/g in cranefly larvae, and 0.046–0.25 µg/g in riparian spiders. In contrast to Se, we found that Hg concentrations in all environmental compartments were not related to the proportion of the watershed mined, suggesting that Hg is not being released from, nor bioaccumulating within, MTM-VF watersheds. We also did not find clear evidence for a reduction in Hg methylation or bioaccumulation under elevated Se concentrations: water, sediment, biofilm, and riparian spiders exhibited no relationship between Hg and Se; only cranefly larvae exhibited a negative relationship (p = 0.0002, r2 = 0.42). We suggest that the type of surface mining matrix rock, with resultant alkaline or acid mine drainage, is important for the speciation, mobility, and bioaccumulation of trace elements within watersheds affected by mining activities. © 2020, Springer Nature Switzerland AG.
英文关键词	Alkaline mine drainage; Appalachia; Coal; Mercury; Methylmercury; Mountaintop mining; Selenium
语种	英语
scopus关键词	bioaccumulation; coal mining; concentration (composition); larva; mercury (element); methylation; mine drainage; mining; mountain region; riparian zone; selenium; stream; trace element; valley fill; watershed; Appalachians; Araneae
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153114
作者单位	Department of Biology, Duke University, Durham, NC, United States; Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung, Taiwan, Taiwan; Department of Civil and Environmental Engineering, Duke University, Durham, NC, United States; Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, United States; Department of Geoscience, Colorado State University, Fort Collins, CO, United States; Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL, United States; Department of Ecology, University of Georgia, Athens, GA, United States
推荐引用方式 GB/T 7714	Gerson J.R.,Naslund L.C.,Liu Y.-T.,et al. Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs[J],2020,150(1).
APA	Gerson J.R..,Naslund L.C..,Liu Y.-T..,Hsu-Kim H..,Driscoll C.T..,...&Bernhardt E.S..(2020).Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs.Biogeochemistry,150(1).
MLA	Gerson J.R.,et al."Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs".Biogeochemistry 150.1(2020).