气候变化领域集成服务门户(CCPortal): Legacy of a half century of Athabasca oil sands development recorded by lake ecosystems

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DOI	10.1073/pnas.1217675110
	Legacy of a half century of Athabasca oil sands development recorded by lake ecosystems
	Kurek J.; Kirk J.L.; Muir D.C.G.; Wang X.; Evans M.S.; Smol J.P.
发表日期	2013
ISSN	0027-8424
起始页码	1761
结束页码	1766
卷号	110 期号:5
英文摘要	The absence of well-executed environmental monitoring in the Athabasca oil sands (Alberta, Canada) has necessitated the use of indirect approaches to determine background conditions of freshwater ecosystems before development of one of the Earth's largest energy deposits. Here, weuse highly resolved lake sediment records to provide ecological contextto ∼50 y of oil sands development and other environmental changes affecting lake ecosystems in the region. We show that polycyclic aromatic hydrocarbons (PAHs) within lake sediments, particularly C1-C4-alkylated PAHs, increased significantly after development of the bitumen resource began, followed by significant increases in dibenzothiophenes. Total PAH fluxes in the modern sediments of our six study lakes, including one site ∼90 km northwest of the major development area, are now ∼2.5-23 times greater than ∼1960 levels. PAH ratios indicate temporal shifts from primarily wood combustion to petrogenic sources that coincide with greater oil sands development. Canadianinterim sedimentquality guidelines for PAHs have been exceeded since the mid-1980s at the most impacted site. A paleoecological assessment of Daphnia shows that this sentinel zooplankter has not yet been negatively impacted by decades of high atmospheric PAH deposition. Rather, coincident with increases in PAHs, climate-induced shifts in aquatic primary production related to warmer and drier conditions are the primary environmental drivers producing marked daphniid shifts after ∼1960 to 1970. Because of the striking increase in PAHs, elevated primary production, and zooplankton changes, these oil sands lake ecosystems have entered new ecological states completely distinct from those of previous centuries.
英文关键词	Atmospheric deposition; Cladocera; Contaminants; Environmental stressors; Paleolimnology
语种	英语
scopus关键词	dibenzothiophene derivative; oil; polycyclic aromatic hydrocarbon; article; atmosphere; Canada; Daphnia; environmental change; lake ecosystem; lake sediment; nonhuman; paleoecology; priority journal; sand; zooplankton; Alberta; Ecology; Ecosystem; Environmental Monitoring; Fresh Water; Fuel Oils; Geography; Geologic Sediments; Hydrocarbons; Lakes; Oil and Gas Fields; Polycyclic Hydrocarbons, Aromatic; Time Factors; Water Pollutants, Chemical
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159124
作者单位	Kurek, J., Paleoecological Environmental Assessment and Research Laboratory, Department of Biology, Queen's University, Kingston, ON K7L 3N6, Canada; Kirk, J.L., Aquatic Contaminants Research Division, Environment Canada, Burlington, ON L7R 4A6, Canada; Muir, D.C.G., Aquatic Contaminants Research Division, Environment Canada, Burlington, ON L7R 4A6, Canada; Wang, X., Aquatic Contaminants Research Division, Environment Canada, Burlington, ON L7R 4A6, Canada; Evans, M.S., Aquatic Contaminants Research Division, Environment Canada, Saskatoon, SK S7N 3H5, Canada; Smol, J.P., Paleoecological Environmental Assessment and Research Laboratory, Department of Biology, Queen's University, Kingston, ON K7L 3N6, Canada
推荐引用方式 GB/T 7714	Kurek J.,Kirk J.L.,Muir D.C.G.,et al. Legacy of a half century of Athabasca oil sands development recorded by lake ecosystems[J],2013,110(5).
APA	Kurek J.,Kirk J.L.,Muir D.C.G.,Wang X.,Evans M.S.,&Smol J.P..(2013).Legacy of a half century of Athabasca oil sands development recorded by lake ecosystems.Proceedings of the National Academy of Sciences of the United States of America,110(5).
MLA	Kurek J.,et al."Legacy of a half century of Athabasca oil sands development recorded by lake ecosystems".Proceedings of the National Academy of Sciences of the United States of America 110.5(2013).