Salinization as a driver of eutrophication symptoms in an urban lake (Lake Wilcox, Ontario, Canada)

Radosavljevic, Jovana; Slowinski, Stephanie; Shafii, Mahyar; Akbarzadeh, Zahra; Rezanezhad, Fereidoun; Parsons, Christopher T.; Withers, William; Cappellen, Philippe Van

doi:10.1016/j.scitotenv.2022.157336

Cited by 17 publications

(16 citation statements)

References 112 publications

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“…Furthermore, salinization can alter P speciation by decreasing P Fe and P Ex . Dissolved phosphate ions can be displaced from sorption sites by competing anions, in particular chloride, hence reducing P Ex (McCarter et al., 2019; Spiteri et al., 2008), while the intensification of hypolimnion hypoxia accompanying the salinization of LW (Radosavljevic et al., 2022) enhances the release of P Fe to solution due to the reductive dissolution of ferric iron oxyhydroxides (Parsons et al., 2017; Reed et al., 2011).…”

Section: Discussionmentioning

confidence: 99%

“…The sediment core depth profile data obtained in this study are openly available on the Federated Research Data Repository (FRDR) website at the following link: https://doi.org/10.20383/103.0634 (Slowinski et al, 2023). The water chemistry data provided by the City of Richmond Hill and used as ancillary data in this study can be obtained on the FRDR website at the following link: https://doi.org/10.20383/102.0540 (Radosavljevic & Van Cappellen, 2023). Financial support was provided by the Natural Science and Engineering Research Council of Canada (NSERC) through a Strategic Partnerships Grant (STPGP 521515-18), and by the Global Water Futures program funded by the Canada First Research Excellence Fund through the Lake Futures and Managing Urban Eutrophication Risks projects.…”

Section: Data Availability Statementmentioning

confidence: 99%

“…Our previous analysis of LW's post‐1990 water chemistry data revealed an intensification of internal P loading caused by the rapid increase in the lake's salinity that stabilizes the water column's summer stratification (Radosavljevic et al., 2022). The latter promotes longer periods of bottom water hypoxia during which the sediments release dissolved P (Figure 5), mostly as dissolved inorganic P (DIP), to the hypolimnion (Markelov et al., 2019; Nürnberg, 1987).…”

Section: Phosphorus Budget Calculationsmentioning

confidence: 99%

“…The latter promotes longer periods of bottom water hypoxia during which the sediments release dissolved P (Figure 5), mostly as dissolved inorganic P (DIP), to the hypolimnion (Markelov et al., 2019; Nürnberg, 1987). As a result, the DIP to TP molar ratio (DIP:TP) in the hypolimnion also exhibited an increasing trend with time, with an average DIP:TP value of 0.76 in Phase 4 and 0.55 in Phase 3 (Radosavljevic et al., 2022). Assuming that the increase in the DIP:TP ratio from Phase 3 to Phase 4 was proportional to the increase of the internal P load from the sediments, a value for F int in Phase 3 of 0.45 kmol y −1 was estimated.…”

Section: Phosphorus Budget Calculationsmentioning

confidence: 99%

“…Radosavljevic & Van Cappellen, 2023). At the same time, the progressive salinization of the lake, primarily due…”

mentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Data Availability Statementmentioning

confidence: 99%

Section: Phosphorus Budget Calculationsmentioning

confidence: 99%

Section: Phosphorus Budget Calculationsmentioning

confidence: 99%

“…Radosavljevic & Van Cappellen, 2023). At the same time, the progressive salinization of the lake, primarily due…”

mentioning

confidence: 99%

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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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Warding off freshwater salinization: Do current criteria measure up?

Kelly,

Free,

Kolada

et al. 2023

WIREs Water

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Salinization is a global threat to freshwater habitats that has been intensified by climate change. Monitoring, assessment and management of salinity is therefore essential. The first step is to set criteria that are sufficiently stringent to protect ecosystem health. However, many countries have not yet defined criteria, and there are substantial differences between criteria. This has been noted in the EU, where salinity is a required “supporting element” for ecological status in inland waters but also for implementation of UN Sustainable Development Goal (SDG) indicator 6.3.2. for “good ambient water quality” where different approaches and widely different threshold values were reported for salinity criteria. Much of this information has not been published and is difficult to access, hindering further efforts to address the problem. We first discuss the implications of salinization for freshwater ecological health. We go on to discuss the principles and guidelines on how salinity criteria to protect ecology should be established. Next, we review salinity criteria submitted as part of implementation of SDG indicator 6.3.2 and the EU Water Framework Directive. Finally, we discuss setting salinity thresholds in an already‐warming world and the challenges facing anyone trying to develop salinity criteria to protect freshwater ecosystems.This article is categorized under: Water and Life > Stresses and Pressures on Ecosystems Water and Life > Conservation, Management, and Awareness Science of Water > Water Quality

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Microbial and environmental medium–driven responses to phosphorus fraction changes in the sediments of different lake types during the freezing period

Ma,

Yao,

Zhang

et al. 2024

Environ Sci Pollut Res

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Salinization as a driver of eutrophication symptoms in an urban lake (Lake Wilcox, Ontario, Canada)

Cited by 17 publications

References 112 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

Warding off freshwater salinization: Do current criteria measure up?

Microbial and environmental medium–driven responses to phosphorus fraction changes in the sediments of different lake types during the freezing period

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