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    Abundance and composition of microplastics in surface waters and sediments of five south-central Lake Ontario tributaries

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    Author
    Bleier, Tammy Lynn
    Keyword
    Microplastics
    Lake ontario
    Readers/Advisors
    Chislock, Michael
    Date Published
    2022-09-01
    
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    URI
    http://hdl.handle.net/20.500.12648/8599
    Abstract
    More than 10,000 metric tons of plastic enter the Great Lakes every year. Most of this is microplastic, tiny plastic particles less than five millimeters in length or diameter. Microplastic pollution is a growing environmental concern in the Great Lakes where these particles can affect aquatic life as well as humans if ingested. To better understand potential sources of microplastics in Lake Ontario, we surveyed microplastic concentration in five tributaries within the south-central Lake Ontario basin in both surface waters and sediments. We analyzed the microplastic morphologies and polymer types and compared the results to three sites in nearshore south-central Lake Ontario. Tributaries surface samples had significantly higher microplastic concentrations (4.9 microplastics/m³) compared to lake sites (1.3 microplastics/m³). Tributary sediments had an average concentration of 0.16 microplastics/g dry weight. Fibers were the most common particle morphologies in tributary surface waters (49%) and sediments (52%) while fragments were the most common morphology found in lake surface waters (73%). These morphologies are harder for aquatic life to pass if ingested and are more likely to remain in the gut, leading to potential health issues and bioaccumulation in the food web. Polyethylene (recycling types two and four) and Other polymers (recycling type 7) accounted for over 90% of microplastics captured. Tributaries are important sources of microplastic pollution in south-central Lake Ontario and should be included in plastic prevention strategies. Furthermore, knowing the most prevalent morphologies and polymers may help to pinpoint sources of plastic and contribute to targeted prevention
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