气候变化领域集成服务门户(CCPortal): Ionic aluminium concentrations exceed thresholds for aquatic health in Nova Scotian rivers; even during conditions of high dissolved organic carbon and low flow

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DOI	10.5194/hess-24-4763-2020
	Ionic aluminium concentrations exceed thresholds for aquatic health in Nova Scotian rivers; even during conditions of high dissolved organic carbon and low flow
	Sterling S.M.; MacLeod S.; Rotteveel L.; Hart K.; Clair T.A.; Halfyard E.A.; O'Brien N.L.
发表日期	2020
ISSN	1027-5606
起始页码	4763
结束页码	4775
卷号	24 期号:10
英文摘要	Acid deposition released large amounts of aluminium into streams and lakes during the last century in northern Europe and eastern North America. Elevated aluminium concentrations caused major environmental concern due to aluminium's toxicity to terrestrial and aquatic organisms and led to the extirpation of wild Atlantic salmon populations. Air pollution reduction legislation that began in the 1990s in North America and Europe successfully reduced acid deposition, and the aluminium problem was widely considered solved. However, accumulating evidence indicates that freshwater systems still show delays in recovery from acidification, with poorly understood implications for aluminium concentrations. Here, we investigate spatial and temporal patterns of labile cationic forms of aluminium (Ali) from 2015 to 2018 in 10 catchments in Nova Scotia, Canada; this region was one of the hardest hit by acid deposition, although it was not considered to have an aluminium problem due to its high dissolved organic carbon (DOC) concentrations that were expected to reduce Ali concentrations. Surprisingly, our results show the widespread and frequent occurrences of Ali concentrations that exceed toxic thresholds in all sampled rivers despite high DOC concentrations. Generalized linear mixed model results reveal that DOC, instead of being inversely related to Ali, is the strongest predictor (positive) of Ali concentrations, suggesting that the recruitment properties of DOC in soils outweigh its protective properties in streams. Lastly, we find that, contrary to the common conceptualization that high Ali levels are associated with storm flow, high Ali concentrations are found during base flow. Our results demonstrate that elevated Ali concentrations in Nova Scotia continue to pose a threat to aquatic organisms, such as the biologically, economically, and culturally significant Atlantic salmon (Salmo salar). © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	Air pollution; Aluminum; Aluminum alloys; Catchments; Deposition; Organic carbon; River pollution; Stream flow; Aluminium concentration; Dissolved organic carbon; Eastern north america; Environmental concerns; Generalized linear mixed models; Pollution reduction; Protective properties; Spatial and temporal patterns; Aquatic organisms; acid deposition; acidification; aluminum; aquatic organism; catchment; commercial species; concentration (composition); dissolved organic carbon; low flow; salmonid; threshold; toxicity; Atlantic Ocean; Canada; Europe; Nova Scotia; Salmo salar
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159292
作者单位	Sterling, S.M., Sterling Hydrology Research Group, Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; MacLeod, S., Coastal Action, Lunenburg, NS, Canada; Rotteveel, L., Sterling Hydrology Research Group, Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; Hart, K., Sterling Hydrology Research Group, Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; Clair, T.A., Sterling Hydrology Research Group, Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; Halfyard, E.A., Nova Scotia Salmon Association, Chester, NS, Canada; O'Brien, N.L., Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada
推荐引用方式 GB/T 7714	Sterling S.M.,MacLeod S.,Rotteveel L.,et al. Ionic aluminium concentrations exceed thresholds for aquatic health in Nova Scotian rivers; even during conditions of high dissolved organic carbon and low flow[J],2020,24(10).
APA	Sterling S.M..,MacLeod S..,Rotteveel L..,Hart K..,Clair T.A..,...&O'Brien N.L..(2020).Ionic aluminium concentrations exceed thresholds for aquatic health in Nova Scotian rivers; even during conditions of high dissolved organic carbon and low flow.Hydrology and Earth System Sciences,24(10).
MLA	Sterling S.M.,et al."Ionic aluminium concentrations exceed thresholds for aquatic health in Nova Scotian rivers; even during conditions of high dissolved organic carbon and low flow".Hydrology and Earth System Sciences 24.10(2020).