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Exploitation of the Athabasca Oil Sands has expanded hugely over the last 40 years. Regional emissions of oxidised sulphur and nitrogen compounds increased rapidly over this period and similar emissions have been linked to lake acidification in other parts of North America and Europe. To determine whether lakes in the region have undergone acidification, 12 lakes within the Regional Municipality of Wood Buffalo and the Caribou Mountains were selected to cover chemical and spatial gradients and sediment cores were obtained for palaeolimnological analyses including radiometric dating, diatom analysis, isotopic analysis of bulk sediment 13C and 15N, and spheroidal carbonaceous particles (SCPs). All lake sediment cores show evidence of industrial contamination based on SCPs, but there is no clear industrial signal in stable isotopes. Most lakes showed changes in diatom assemblages and sediment C:N ratios consistent with nutrient enrichment over various timescales, with potential drivers including climatic change, forest fires and anthropogenic nitrogen deposition. Only one of the 12 lakes investigated showed strong evidence of acidification with a decline in diatom-inferred pH from 6.3 to 5.6 since 1970 linked to increasing relative abundances of the acidophilous diatom species Actinella punctata, Asterionella ralfsii and Fragilariforma polygonata. Analysis of mercury (Hg) in the acidified lake showed increasing sediment fluxes over the last 20 years, a possible indication of industrial contamination. The acidified lake is the smallest of those studied with the shortest residence time, suggesting a limited capacity for neutralisation of acid inputs in catchment soils or by inlake processes. CURTIS, Chris J., Roger FLOWER, Neil ROSE, James SHILLAND, Gavin L. SIMPSON, Simon TURNER, Handong YANG, and Sergi PLA. 2010. “Palaeolimnological Assessment of Lake Acidification and Environmental Change in the Athabasca Oil Sands Region, Alberta”. Journal of Limnology 69 (s1):92-104. https://doi.org/10.4081/jlimnol.2010.s1.92. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Atmospheric Hg accumulation rates determined using Sphagnum moss from ombrotrophic (rain-fed) bogs in the Athabasca Bituminous Sands region of northern Alberta, Canada William Shotyk, Chad W. Cuss Ecological Indicators : 2019 Dissolved Organic Carbon in Lakes of the Athabasca Oil Sands Region: Is Color an Indicator of Acid Sensitivity? Dane Blanchard, Julian Aherne, Paul Makar Environmental Science & Technology : 2021 Assessment of multi-trophic changes in a shallow boreal lake simultaneously exposed to climate change and aerial deposition of contaminants from the Athabasca Oil Sands Region, Canada Jamie C Summers, Joshua Kurek, Kathleen M Rühland, Erin E Neville, John P Smol Science of The Total Environment : 2017 Zooplankton communities are good indicators of potential impacts of Athabasca oil sands operations on downwind boreal lakes M.U. Mohamed Anas, Kenneth A. Scott, Ryan N. Cooper, Björn Wissel, Ralph Smith Canadian Journal of Fisheries and Aquatic Sciences : 2014 Can plant or lichen natural abundance 15N ratios indicate the influence of oil sands N emissions on bogs? R. Kelman Wieder, Melanie A. Vile, Dale H. Vitt, Kimberli D. Scott, Bin Xu, James C. Quinn, Cara M. 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Engstrom Science Advances : 2020 A decadal synthesis of atmospheric emissions, ambient air quality, and deposition in the oil sands region Erin C. Horb, Gregory R. Wentworth, Paul A. Makar, John Liggio, Katherine Hayden, Elisa I. Boutzis, Danielle L. Beausoleil, Roderick O. Hazewinkel, Ashley C. Mahaffey, Diogo Sayanda, Faye Wyatt, Monique G. Dubé Integrated Environmental Assessment and Management : 2022 Acid deposition in the Athabasca Oil Sands Region: a policy perspective Colin J. Whitfield, Shaun A. Watmough Environmental Monitoring and Assessment : 2015 A re-analysis and review of elemental and polycyclic aromatic compound deposition in snow and lake sediments from Canada's Oil Sands Region integrating industrial performance and climatic variables T.J. Arciszewski Science of The Total Environment : 2022 Relationship between ecological indicators (Arcellacea), total mercury concentrations and grain size in lakes within the Athabasca oil sands region, Alberta L. A. Neville, R. T. 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Hall Journal of Hydrology: Regional Studies : 2022 Spatiotemporal patterns of mercury accumulation in lake sediments of western North America Paul E. Drevnick, Colin A. Cooke, Daniella Barraza, Jules M. Blais, Kenneth H. Coale, Brian F. Cumming, Chris J. Curtis, Biplob Das, William F. Donahue, Collin A. Eagles-Smith, Daniel R. Engstrom, William F. Fitzgerald, Chad V. Furl, John E. Gray, Roland I. Hall, Togwell A. Jackson, Kathleen R. Laird, W. Lyle Lockhart, Robie W. Macdonald, M. Alisa Mast, Callie Mathieu, Derek C.G. Muir, Peter M. Outridge, Scott A. Reinemann, Sarah E. Rothenberg, Ana Carolina Ruiz-Fernández, Vincent L. St. Louis, Rhea D. Sanders, Hamed Sanei, Elliott K. Skierszkan, Peter C. Van Metre, Timothy J. Veverica, Johan A. Wiklund, Brent B. Wolfe Science of The Total Environment : 2016 20th Century Atmospheric Deposition and Acidification Trends in Lakes of the Sierra Nevada, California, USA Andrea M. Heard, James O. Sickman, Neil L. Rose, Danuta M. Bennett, Delores M. Lucero, John M. Melack, Jason H. Curtis Environmental Science & Technology : 2014 Lake-sediment record of PAH, mercury, and fly-ash particle deposition near coal-fired power plants in Central Alberta, Canada Benjamin D. Barst, Jason M.E. Ahad, Neil L. Rose, Josué J. Jautzy, Paul E. Drevnick, Paul R. Gammon, Hamed Sanei, Martine M. Savard Environmental Pollution : 2017 Regional climate changes drive increased scaled-chrysophyte abundance in lakes downwind of Athabasca Oil Sands nitrogen emissions Graham R. Mushet, Kathleen R. Laird, Biplob Das, Brittany Hesjedal, Peter R. Leavitt, Kenneth A. Scott, Gavin L. Simpson, Björn Wissel, Jared D. Wolfe, Brian F. Cumming Journal of Paleolimnology : 2017 Estimates of exceedances of critical loads for acidifying deposition in Alberta and Saskatchewan Paul A. Makar, Ayodeji Akingunola, Julian Aherne, Amanda S. Cole, Yayne-abeba Aklilu, Junhua Zhang, Isaac Wong, Katherine Hayden, Shao-Meng Li, Jane Kirk, Ken Scott, Michael D. 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