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Informing the Exposure Landscape: The Fate of Microplastics in a Large Pelagic In-Lake Mesocosm Experiment
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In a large lake experiment, researchers tracked where microplastics go after entering a freshwater ecosystem and found that after 10 weeks, over 98% settled to the surface or bottom, while only about 1% remained suspended in the water. Organisms feeding at the water surface and bottom sediments had the highest exposure to microplastics, while those in the middle water column had much less. This helps explain which aquatic organisms are most at risk and how microplastics might enter the food chain that leads to human consumption.
Understanding microplastic exposure and effects is critical to understanding risk. Here, we used large, in-lake closed-bottom mesocosms to investigate exposure and effects on pelagic freshwater ecosystems. This article provides details about the experimental design and results on the transport of microplastics and exposure to pelagic organisms. Our experiment included three polymers of microplastics (PE, PS, and PET) ranging in density and size. Nominal concentrations ranged from 0 to 29,240 microplastics per liter on a log scale. Mesocosms enclosed natural microbial, phytoplankton, and zooplankton communities and yellow perch (Perca flavescens). We quantified and characterized microplastics in the water column and in components of the food web (biofilm on the walls, zooplankton, and fish). The microplastics in the water stratified vertically according to size and density. After 10 weeks, about 1% of the microplastics added were in the water column, 0.4% attached to biofilm on the walls, 0.01% within zooplankton, and 0.0001% in fish. Visual observations suggest the remaining >98% were in a surface slick and on the bottom. Our study suggests organisms that feed at the surface and in the benthos are likely most at risk, and demonstrates the value of measuring exposure and transport to inform experimental designs and achieve target concentrations in different matrices within toxicity tests.
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Researchers tracked how microplastic fragments of varying buoyancy partition among water column, sediment, and surface film compartments in an experimental aquatic system, finding that particle density and biofouling strongly determine where MPs ultimately accumulate in the environment.
Governing Vertical Distribution of Microplastics in Freshwater Ecosystems: a Comprehensive Review
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This review pulls together existing research on what makes microplastics sink, float, or settle into the sediment at the bottom of lakes and rivers—factors like particle size, water conditions, and even how fish and microbes interact with them. Understanding where these tiny plastic particles end up matters because it affects how much ends up in the food chain (and eventually our drinking water and seafood), yet scientists still don't fully understand how all these factors work together in real-world conditions. More precise models are needed before we can accurately predict microplastic exposure risks and design better pollution controls.
WhereIs All thePlastic? How Microplastic Partitionsacross Environmental Compartments within a Large Pelagic In-Lake Mesocosm
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Researchers added microplastic fragments of varying buoyancy — polyethylene, polystyrene, and polyethylene terephthalate — to a large pelagic in-lake mesocosm to track how microplastics partition across water, sediment, and biological compartments in aquatic ecosystems.
Quantifying microplastic residence times in lakes using mesocosm experiments and 1D random walk model
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Researchers combined in-lake mesocosm experiments with 1D random walk modeling to quantify microplastic residence times across three size fractions (1-5, 28-48, and 53-63 micrometers) in a 12 m deep lake, measuring residence times of 1-24 days during summer stratification and autumn turnover periods over one year.
Experimental investigation of microplastic residence times in lake systems during thermal stratification and lake turnover
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Mesocosm experiments in a lake showed that thermal stratification significantly affects how long microplastics remain suspended in the water column, with particles staying near the surface longer during summer stratification and sinking faster during lake turnover in fall. Residence time directly influences how likely aquatic organisms are to encounter and ingest microplastics. Understanding these seasonal dynamics is key for predicting microplastic exposure risks in lake ecosystems.
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