Building upon open-barrel corer and sectioning systems to foster the continuing legacy of John Glew

Telford, James V.; Kay, Mitchell L.; Heide, Harman Vander; Wiklund, Johan A.; Owca, Tanner J.; Faber, Jelle A.; Wolfe, Brent B.; Hall, Roland I.

doi:10.1007/s10933-020-00162-w

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Core 1 was 76 cm long and used for geochemical analyses; core 2 was 88 cm long and used for age dating and chlorophyll‐ a analysis. The cores were sectioned in the field into 1‐cm intervals using a vertical extruder (Telford et al., 2021). Each sample from core 1 was placed in a Whirl‐Pak© bag and frozen at −20°C and later freeze dried.…”

Section: Methodsmentioning

confidence: 99%

Contrasting Impacts of Agricultural Intensification and Urbanization on Lake Phosphorus Cycling and Implications for Managing Eutrophication

Slowinski,

Radosavljevic,

Graham

et al. 2023

JGR Biogeosciences

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Sediment core and water quality data, together with historical information on land use/land cover (LULC), were used to reconstruct changes in phosphorus (P) loading and cycling in Lake Wilcox, Ontario, Canada, since the early 1920s. After first being cleared for farming, the originally forested watershed subsequently underwent urbanization. The large increase in P loading accompanying agricultural intensification after World War II caused the eutrophication of the lake. However, improved soil conservation since the 1980s and urban stormwater management since the 1990s have brought watershed P loading and sediment accumulation down to levels comparable to the early 1900s. Yet, the lake continues to exhibit eutrophication‐like symptoms, especially the intensification of hypoxia in the hypolimnion. Post‐2000 water quality data indicate that the latter is not driven by external P loading from the watershed, but rather by rapid salinization that strengthens the lake's summer stratification and enhances internal P loading. Salinization is caused by the increasing application of deicing agents in the expanding urban area. Curbing salt inputs will therefore be essential to restore the lake. Overall, our results provide new insights into the shifts in lake biogeochemistry associated with LULC changes and the implementation of best management practices. The approaches and findings of our case study have broad applicability for the large number of freshwater ecosystems worldwide that are experiencing salinization.

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Section: Methodsmentioning

confidence: 99%

Contrasting Impacts of Agricultural Intensification and Urbanization on Lake Phosphorus Cycling and Implications for Managing Eutrophication

Slowinski,

Radosavljevic,

Graham

et al. 2023

JGR Biogeosciences

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“…Sediment cores were collected from each of the study lakes during 2010-2019 using a gravity corer (Glew, 1989) or hammer-driven gravity corer (Telford et al, 2021), as described in Wiklund et al (2012), Kay et al (2019) and Klemt et al (2020). Sediment cores were sectioned into 0.5-or 1.0-cm intervals using a vertical extruder (Glew, 1988;Telford et al, 2021) within 24 h of collection at a local field base, and the samples were transported to the University of Waterloo, refrigerated (4 °C) and stored in the dark until further analysis. Because the sediment records had been utilized for other purposes, stratigraphic sampling and analysis was dependent on available material, with the exception of the previously published THg record from PAD 18 (Wiklund et al, 2012).…”

Section: Sediment Core Collection and Analysesmentioning

confidence: 99%

“…Mercury deposition has been a focus of high concern within and downstream of the AOSR due to emissions from bitumen upgrading facilities, vehicle operations, deforestation, coke piles and dust from open pit mines (Dowdeswell et al, 2010;Kirk et al, 2014). Elevated supply of Hg can pose negative consequences for aquatic and terrestrial ecosystems because Hg can be converted to methylmercury, a toxic organic form that may bioaccumulate and biomagnify through food webs and pose risks to higher trophic levels including human consumers (Gilmour et al, 1992;Ullrich et al, 2001;Driscoll et al, 2013). As reported by Hebert et al (2013), data from Canada's National Pollutant Release Inventory indicate that total annual Hg emissions from oil sands operations within the AOSR almost tripled between 2000 and 2010.…”

Section: Introductionmentioning

confidence: 99%

Assessment of mercury enrichment in lake sediment records from Alberta Oil Sands development via fluvial and atmospheric pathways

Kay

Wiklund

Sun

et al. 2022

Front. Environ. Sci.

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Exploitation of bitumen-rich deposits in the Alberta Oil Sands Region (AOSR) by large-scale mining and processing activities has generated widespread concern about the potential for dispersal of harmful contaminants to aquatic ecosystems via fluvial and atmospheric pathways. The release of mercury has received attention because it is a potent neurotoxin for wildlife and humans. However, knowledge of baseline mercury concentration prior to disturbance is required to evaluate the extent to which oil sands development has contributed mercury to aquatic ecosystems. Here, we use stratigraphic analysis of total mercury concentration ([THg]) in radiometrically dated sediment cores from nine floodplain lakes in the AOSR and downstream Peace-Athabasca Delta (PAD) and two upland lakes in the PAD region to establish pre-1900 baseline [THg] and evaluate if [THg] has become enriched via fluvial and atmospheric pathways since oil sands mining and processing began in 1967. Concentrations of THg in sediment cores from the study lakes range from 0.022–0.096 mg/kg (dry wt.) and are below the Canadian interim sediment quality guidelines for freshwater (0.17 mg/kg). Results demonstrate no enrichment of [THg] above pre-1900 baseline via fluvial pathways at floodplain lakes in the AOSR or PAD. Enrichment of [THg] was detected via atmospheric pathways at upland lakes in the PAD region, but this occurred prior to oil sands development and aligns with long-range transport of emissions from coal combustion and other anthropogenic sources across the northern hemisphere recognized in many other lake sediment records. The inventory of anthropogenic [THg] in the upland lakes in the AOSR is less than at the Experimental Lakes Area of northwestern Ontario (Canada), widely regarded as a “pristine” area. The absence of enrichment of [THg] in lake sediment via fluvial pathways is a critical finding for stakeholders, and we recommend that monitoring at the floodplain lakes be used to inform stewardship as oil sands operators prepare to discharge treated oil sands process waters directly into the Athabasca River upstream of the PAD.

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Paleolimnological assessment of past hydro-ecological variation at a shallow hardwater lake in the Athabasca Oil Sands Region before potential onset of industrial development

Zabel

Soliguin

Wiklund

et al. 2022

Journal of Hydrology: Regional Studies

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Building upon open-barrel corer and sectioning systems to foster the continuing legacy of John Glew

Cited by 5 publications

References 15 publications

Contrasting Impacts of Agricultural Intensification and Urbanization on Lake Phosphorus Cycling and Implications for Managing Eutrophication

Contrasting Impacts of Agricultural Intensification and Urbanization on Lake Phosphorus Cycling and Implications for Managing Eutrophication

Assessment of mercury enrichment in lake sediment records from Alberta Oil Sands development via fluvial and atmospheric pathways

Paleolimnological assessment of past hydro-ecological variation at a shallow hardwater lake in the Athabasca Oil Sands Region before potential onset of industrial development

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