Nutrient concentrations and loadings in the St. Clair River–Detroit River Great Lakes Interconnecting Channel

Burniston, D.; Dove, Alice; Backus, Sean; Thompson, Aaron F.

doi:10.1016/j.jglr.2018.02.005

Cited by 21 publications

(18 citation statements)

References 12 publications

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“…[ 18 ], as well as habitat variation [ 14 ], among sampling locations, are strong drivers of the spatial variation of the microbial communities. We did not measure abiotic parameters such as nutrient levels at our sampling locations; however, due to the connectivity of the two lakes by the Detroit River [ 19 ], the short distances among the sampling locations and the eutrophication of Lake Erie [ 5 ] and St. Clair [ 20 ], our sampling locations might have similar habitat features which consequently resulted in the little spatial variation of the BCCs in our study. The chao 1 index of CB was higher than other sampling sites, potentially due to presence of more greenhouse agriculture area and consequently higher bioavailability of nutrients; however, more studies are needed to address the influence of greenhouse agriculture area on BC diversity.…”

Section: Discussionmentioning

confidence: 99%

Spatio-temporal dynamics of bacterial communities in the shoreline of Laurentian great Lake Erie and Lake St. Clair’s large freshwater ecosystems

2021

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Background Long-term trends in freshwater bacterial community composition (BCC) and dynamics are not yet well characterized, particularly in large lake ecosystems. We addressed this gap by temporally (15 months) and spatially (6 sampling locations) characterizing BCC variation in lakes Erie and St. Clair; two connected ecosystems in the Laurentian Great Lakes. Results We found a spatial variation of the BCC between the two lakes and among the sampling locations (significant changes in the relative abundance of 16% of the identified OTUs at the sampling location level). We observed five distinct temporal clusters (UPGMA broad-scale temporal variation) corresponding to seasonal variation over the 15 months of sampling. Temporal variation among months was high, with significant variation in the relative abundance of 69% of the OTUs. We identified significant differences in taxonomic composition between summer months of 2016 and 2017, with a corresponding significant reduction in the diversity of BCC in summer 2017. Conclusions As bacteria play a key role in biogeochemical cycling, and hence in healthy ecosystem function our study defines the scope for temporal and spatial variation in large lake ecosystems. Our data also show that freshwater BCC could serve as an effective proxy and monitoring tool to access large lake health.

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Section: Discussionmentioning

confidence: 99%

Spatio-temporal dynamics of bacterial communities in the shoreline of Laurentian great Lake Erie and Lake St. Clair’s large freshwater ecosystems

2021

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“…Nutrient loads from the St. Clair River and three major tributaries (Thames, Sydenham, and Clinton rivers) were calculated as in Scavia et al (2019), using daily concentrations averaged over 2013 to 2015, which compared well with estimates from other studies (e.g., Burniston et al, 2018). For all other tributaries, which are minor in terms of flow and nutrient loads, the concentrations were kept as those as in 2009 (Bocaniov & Scavia, 2018).…”

Section: Nutrient Loading Retention and Tributary-specific Nutrient Response Curves And Retention Timesmentioning

confidence: 99%

On the Role of a Large Shallow Lake (Lake St. Clair, USA‐Canada) in Modulating Phosphorus Loads to Lake Erie

Bocaniov

Cappellen

Scavia

2019

Water Resources Research

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It is often assumed that large shallow water bodies are net sediment nondepositional annually and that if they have nutrient loads from multiple sources, those loads are quickly homogenized before exiting the water bodies. Where this is not the case, it impacts understanding and predicting consequences of nutrient load reductions, both for the water body and for those downstream of it. We applied a threedimensional ecological model to a large shallow lake, Lake St. Clair (US/Canada), to quantify the total and dissolved reactive phosphorus (TP and DRP) transport and retention, and construct tributary-specific relationships between phosphorus load to the lake and the amount of phosphorus that leaves the lake for the three major tributaries. Lake St. Clair is situated between the St. Clair and Detroit rivers, the latter enters Lake Erie. Efforts to reduce Lake Erie's re-eutrophication requires an understanding of nutrient transport and retention in each of its subwatersheds including those that feed indirectly via Lake St. Clair. We found that over the simulation period, the lake retained a significant portion of TP (17%) and DRP (35%) load and that TP and DRP retention was spatially variable and largely controlled by a combination of lake depth, resuspension, and plankton uptake. Compared to the Clinton and Sydenham rivers, the Thames River contributed a larger proportion of its load to the lake's outflow. However, because the lake's load is dominated by the St. Clair River, 40% reductions of nutrients from those subwatersheds will result in less than a 5% reduction in the load to Lake Erie. Key Points:• A large shallow lake with a 9 day water retention time still retains 17% of its total phosphorus and 35% of its dissolved phosphorus inputs • Tributary loads are not well-mixed within the lake, leading to spatial-temporal differences in phosphorus retention • While wind-induced resuspension drives interannual variability in phosphors retention, depths greater than 5 m are net depositional Supporting Information:• Supporting Information S1

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“…It has recently been estimated that 58% of the TP load entering the Detroit River system comes from Lake Huron, much higher than earlier estimates. Using measured TP concentrations at the outlet of Lake Huron, Burniston et al estimated its load to be almost 3 times the previous estimates that were based on TP concentrations in the ultraoligotrophic Lake Huron. , They also showed that TP concentrations, especially particulate P, downstream in the St. Clair River were higher than upstream where Lake Huron enters, and that difference has increased over time. Because the concentration differences were not due to additional lateral loads to the river, , it has been suggested that the difference originates from episodic sediment resuspension in Lake Huron that is not captured at the upstream St. Clair River monitoring station.…”

Section: Introductionmentioning

confidence: 94%

Lake Huron’s Phosphorus Contributions to the St. Clair–Detroit River Great Lakes Connecting Channel

Scavia

Anderson

Dove

et al. 2020

Environ. Sci. Technol.

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The United States and Canada called for a 40% load reduction of total phosphorus from 2008 levels entering the western and central basins of Lake Erie to achieve a 6000 MTA target and help reduce its central basin hypoxia. The Detroit River is a significant source of total phosphorus to Lake Erie; it in turn has been reported to receive up to 58% of its load from Lake Huron when accounting for resuspended sediment loads previously unmonitored at the lake outlet. Key open questions are where does this additional load originate, what drives its variability, and how often does it occur. We used a hydrodynamic model, satellite images of resuspension events and ice cover, wave hindcasts, and continuous turbidity measurements at the outlet of Lake Huron to determine where in Lake Huron the undetected load originates and what drives its variability. We show that the additional sediment load, and likely phosphorus, is from wave-induced Lake Huron sediment resuspension, primarily within 30 km of the southeastern shore. When the flow is from southwest or down the center of the lake, the resuspended sediment is not detected at Canada’s sampling station at the head of the St. Clair River.

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Nutrient concentrations and loadings in the St. Clair River–Detroit River Great Lakes Interconnecting Channel

Cited by 21 publications

References 12 publications

Spatio-temporal dynamics of bacterial communities in the shoreline of Laurentian great Lake Erie and Lake St. Clair’s large freshwater ecosystems

Spatio-temporal dynamics of bacterial communities in the shoreline of Laurentian great Lake Erie and Lake St. Clair’s large freshwater ecosystems

On the Role of a Large Shallow Lake (Lake St. Clair, USA‐Canada) in Modulating Phosphorus Loads to Lake Erie

Lake Huron’s Phosphorus Contributions to the St. Clair–Detroit River Great Lakes Connecting Channel

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