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On the likelihood of ecological risks from microplastics in the Laurentian Great Lakes
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This review assessed the likelihood of ecological risks from microplastics in the Laurentian Great Lakes, identifying significant challenges for risk assessment due to inconsistent data quality and lack of standardized methods, and calling for policy development to address microplastic pollution in these iconic ecosystems.
The Laurentian Great Lakes represent important and iconic ecosystems. Among other anthropogenic stressors, microplastic pollution has become a major problem in these lakes. There is a need for policy development, however, assessing the risks of microplastics is complicated due to poor quality and incompatibility of exposure and effect data for microplastics with different properties. Here we provide a probabilistic risk assessment for Great Lakes sediments and surface waters that corrects for the typical mismatch between exposure and effect data, accounts for variability due to sample volume when using trawl samples, for the random spatiotemporal variability of exposure data, for uncertainty in data quality (QA/QC), in the slope of the power law used to rescale the data, and in the HC5 threshold effect concentration obtained from SSDs. A specific, new SSD was developed for freshwater ecosystems. We rank the lakes in order of the increasing likelihood of risks from microplastics, for pelagic and benthic exposures. A lake-wide risk, i.e. where each location exceeds the risk limit, is not found for any of the lakes. However, the probability of a risk from food dilution occurring in parts of the lakes is 13-15% of the benthic exposures in Lakes Erie and Huron, and 8.3-10.3% of the pelagic exposures in Lake Michigan, Lake Huron, Lake Superior, and Lake Erie, and 24% in Lake Ontario. Also see: https://micro2022.sciencesconf.org/427199/document
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Towards a management strategy for microplastic pollution in the Laurentian Great Lakes—ecological risk assessment and management (part 2)
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Researchers applied ecological risk assessment frameworks to evaluate microplastic pollution in the Great Lakes and found that some areas may pose measurable risks to aquatic communities. By comparing proposed safety thresholds with actual monitoring data, they identified specific locations where microplastic concentrations exceed levels considered safe for freshwater organisms. The study represents an important step toward developing practical management strategies for microplastic pollution in one of the world's largest freshwater systems.
On the probability of ecological risks from microplastics in the Laurentian Great lakes
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This study assessed the ecological risks posed by microplastics in the Great Lakes using a probabilistic approach that accounts for data uncertainty. Researchers found that while no lake-wide risk threshold was exceeded, parts of several lakes showed meaningful probabilities of harm, with up to 24% of surface water locations in Lake Ontario at risk. The findings highlight that microplastic pollution in the Great Lakes warrants targeted policy attention, especially in the most contaminated areas.
On the probability of ecological risks from microplastics in the Laurentian Great lake
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Researchers conducted a probabilistic ecological risk assessment of microplastics in Great Lakes sediments, finding that fiber-shaped microplastics posed the highest risk and that current concentrations may already affect benthic organisms in certain areas.
Towards a management strategy for microplastic pollution in the Laurentian Great Lakes - Monitoring (Part 1)
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This review outlines a proposed monitoring strategy for microplastic contamination in the Laurentian Great Lakes, addressing sampling methods, key knowledge gaps, and recommendations to support effective management of plastic pollution in this major freshwater system.
Macroplastics in Lakes: An Underrepresented Ecological Problem?
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