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Boreal ecosystems in northwest Saskatchewan may be threatened by acidification as this area is downwind of atmospheric emissions sources from regional oil sands mining operations. To evaluate the status of lakes in this region, a survey of 259 headwater lakes was conducted during 2007–2008 within ~300 km of Fort McMurray, Alberta. Acid sensitivity by ecoregion increased from Mid-Boreal Upland to Churchill River Upland to Athabasca Plain, with 60% of lakes classified as sensitive (50–200 μeq L–1 acid neutralizing capacity (ANC)), and 8% as very sensitive (<50 μeq L–1 ANC) to acid deposition. Organic anions dominated the acidity balance in most lakes, but non-marine sulphate varied positively with lake elevation and % upland cover (r2 = 0.24). Base cation concentrations (Ca, Mg, K, Na) were correlated with % deciduous forest in the catchment area (r2 = 0.33), while dissolved organic carbon (DOC) was related most strongly to % bog and lake flushing variables (r2 = 0.53). Variation in runoff coefficients derived by isotope mass balance corresponded with catchment area attributes that proxy controls on evaporation, infiltration and storage, and showed some ecoregional differences. The findings have implications for assignment of runoff values required to calculate critical loads of acidity. Although acidification appears not to be significantly advanced, many dilute oligotrophic lakes with pH 6.0 to pH 6.5 are vulnerable to acid deposition. SCOTT, Kenneth A., Björn WISSEL, John J. GIBSON, and Jean S. BIRKS. 2010. “Chemical Characteristics and Acid Sensitivity of Boreal Headwater Lakes in Northwest Saskatchewan”. Journal of Limnology 69 (s1):33-44. https://doi.org/10.4081/jlimnol.2010.s1.33. 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 : A modified approach for estimating the aquatic critical load of acid deposition in northern Saskatchewan, Canada Colin J. Whitfield, Aidan C. Mowat, Kenneth A. Scott, Shaun A. Watmough Atmospheric Environment : 2016 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 Carbon dissolution effects on pH changes of RAMP lakes in northeastern Alberta, Canada F.J. Castrillon-Munoz, J.J. Gibson, S.J. Birks Journal of Hydrology: Regional Studies : 2022 A regional approach for mineral soil weathering estimation and critical load assessment in boreal Saskatchewan, Canada Colin J. Whitfield, Shaun A. Watmough Science of The Total Environment : 2012 Regional trends in evaporation loss and water yield based on stable isotope mass balance of lakes: The Ontario Precambrian Shield surveys J.J. Gibson, S.J. Birks, D. Jeffries, Y. Yi Journal of Hydrology : 2017 Quantifying saline groundwater seepage to surface waters in the Athabasca oil sands region Scott Jasechko, John J. Gibson, S. Jean Birks, Yi Yi Applied Geochemistry : 2012 Critical Loads and Dynamic Risk Assessments Julian Aherne, Dean Jeffries Environmental Pollution : 2015 Impacts and prognosis of natural resource development on aquatic biodiversity in Canada’s boreal zone David Kreutzweiser, Frederick Beall, Kara Webster, Dean Thompson, Irena Creed Environmental Reviews : 2013 Watershed, climate, and stable isotope data (oxygen-18 and deuterium) for 50 boreal lakes in the oil sands region, northeastern Alberta, Canada, 2002–2017 J.J. Gibson, Y. Yi, S.J. Birks Data in Brief : 2020 Critical loads of acidity and exceedances for 1138 lakes and ponds in the Canadian Arctic Tanner Liang, Julian Aherne Science of The Total Environment : 2019 A critical review of the ecological status of lakes and rivers from Canada's oil sands region Tim J. Arciszewski, Roderick R. O. Hazewinkel, Monique G. Dubé Integrated Environmental Assessment and Management : 2022 Runoff to boreal lakes linked to land cover, watershed morphology and permafrost thaw: a 9‐year isotope mass balance assessment J. J. Gibson, S. J. Birks, Y. Yi, D. H. Vitt Hydrological Processes : 2015 Water chemistry, landscape, and spatial controls of δ13C and δ15N of zooplankton taxa in boreal lakes: One size does not fit all M. U. Mohamed Anas, Kenneth A. Scott, Björn Wissel Freshwater Biology : 2019 The state of isotope hydrology research in Canada (2007–2022) Tricia A. Stadnyk, J.J. Gibson, J. Birks, T. L. Holmes Canadian Water Resources Journal / Revue canadienne des ressources hydriques : 2023 Impacts and prognosis of natural resource development on water and wetlands in Canada’s boreal zone Kara L. Webster, Frederick D. Beall, Irena F. Creed, David P. Kreutzweiser Environmental Reviews : 2015 Paleolimnological assessment of limnological change in 10 lakes from northwest Saskatchewan downwind of the Athabasca oils sands based on analysis of siliceous algae and trace metals in sediment cores Kathleen R. Laird, Biplob Das, Melanie Kingsbury, Melissa T. Moos, Sergi Pla-Rabes, Jason M. E. Ahad, Brendan Wiltse, Brian F. Cumming Hydrobiologia : 2013 Suitability of presence vs. absence indicator species to characterize stress gradients: Lessons from zooplankton species of boreal lakes M.U.M. Anas, K.A. Scott, B. Wissel Ecological Indicators : 2013 Isotopic and geochemical surveys of lakes in coastal B.C.: Insights into regional water balance and water quality controls J.J. Gibson, S.J. Birks, Y. Yi, P. Shaw, M.C. Moncur Journal of Hydrology: Regional Studies : 2018 Sources of polycyclic aromatic hydrocarbons (PAHs) to northwestern Saskatchewan lakes east of the Athabasca oil sands Jason M.E. Ahad, Josué J. Jautzy, Brian F. Cumming, Biplob Das, Kathleen R. Laird, Hamed Sanei Organic Geochemistry : 2015 Similar Resilience Attributes in Lakes with Different Management Practices Didier L. Baho, Stina Drakare, Richard K. Johnson, Craig R. Allen, David G. Angeler, John F. Valentine PLoS ONE : 2014 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. Moran, Alain Robichaud, Hazel Cathcart, Pegah Baratzedah, Balbir Pabla, Philip Cheung, Qiong Zheng, Dean S. Jeffries Atmospheric Chemistry and Physics : 2018 Dissolved organic carbon concentrations and fluxes in forest catchments and streams: DOC-3 model Marie-France Jutras, Mina Nasr, Mark Castonguay, Christopher Pit, Joseph H. Pomeroy, Todd P. Smith, Cheng-fu Zhang, Charles D. Ritchie, Fan-Rui Meng, Thomas A. Clair, Paul A. Arp Ecological Modelling : 2011 Taxon-specific variation in δ13C and δ15N of subfossil invertebrate remains: Insights into historical trophodynamics in lake food-webs M.U. Mohamed Anas, Gavin L. Simpson, Peter R. Leavitt, Brian F. Cumming, Kathleen R. Laird, Kenneth A. Scott, Biplob Das, Jared D. Wolfe, Brittany Hesjedal, Graham R. Mushet, Alison Walker, Buddhine J. Meegahage, Björn Wissel Ecological Indicators : 2019 Critical loads of acidity for 90,000 lakes in northern Saskatchewan: A novel approach for mapping regional sensitivity to acidic deposition H. Cathcart, J. Aherne, D.S. Jeffries, K.A. Scott Atmospheric Environment : 2016 Isotopic tracing of hydrologic drivers including permafrost thaw status for lakes across Northeastern Alberta, Canada: A 16-year, 50-lake assessment J.J. Gibson, Y. Yi, S.J. 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Registered in print in Verbania, 7-10-1959, n. 58.

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