A Multicompartment Assessment of Microplastic Contamination in Semi-remote Boreal Lakes.

Autor: McIlwraith HK; Department of Ecology and Evolutionary Biology, University of Toronto, St. George Campus, Toronto, Ontario, Canada.; Plymouth Marine Laboratory, Prospect Place, Plymouth, United Kingdom., Dias M; School of Environmental Studies, Queen's University, Kingston, Ontario, Canada., Orihel DM; School of Environmental Studies, Queen's University, Kingston, Ontario, Canada.; Department of Biology, Queen's University, Kingston, Ontario, Canada., Rennie MD; Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada.; International Institute for Sustainable Development-Experimental Lakes Area, Winnipeg, Manitoba, Canada., Harrison AL; School of Environmental Studies, Queen's University, Kingston, Ontario, Canada.; Institute of Geological Sciences, University of Bern, Bern, Switzerland., Hoffman MJ; School of Mathematics and Statistics, Rochester Institute of Technology, Rochester, New York, USA., Provencher JF; Ecotoxicology and Wildlife Health Division, Environment and Climate Change Canada, Ottawa, Ontario, Canada., Rochman CM; Department of Ecology and Evolutionary Biology, University of Toronto, St. George Campus, Toronto, Ontario, Canada.
Jazyk: angličtina
Zdroj: Environmental toxicology and chemistry [Environ Toxicol Chem] 2024 May; Vol. 43 (5), pp. 999-1011. Date of Electronic Publication: 2024 Feb 28.
DOI: 10.1002/etc.5832
Abstrakt: Microplastic contamination is ubiquitous across the globe, even in remote locations. Still, the sources and pathways of microplastics to such locations are largely unknown. To investigate microplastic contamination in a semi-remote location, we measured microplastic concentrations in nine oligotrophic lakes within and around the International Institute for Sustainable Development-Experimental Lakes Area in northwestern Ontario, Canada. Our first objective was to establish ambient concentrations of microplastics in bottom sediments, surface water, and atmospheric deposition in semi-remote boreal lakes. Across all lakes, mean shallow and deep sediment microplastic concentrations, near-surface water microplastic concentrations from in situ filtering, and dry atmospheric microplastic deposition rates were 551 ± 354 particles kg -1 , 177 ± 103 particles kg -1 , 0.2 ± 0.3 particles L -1 , and 0.4 ± 0.2 particles m -2  day -1 , respectively. Our second objective was to investigate whether microplastic contamination of these lakes is driven by point sources including local runoff and direct anthropogenic inputs or nonpoint sources such as atmospheric deposition. Lakes were selected based on three levels of anthropogenic activity-low, medium, and high-though activity levels were minimal across all study lakes compared with highly populated areas. Whereas a positive correlation would indicate that point sources were a likely pathway, we observed no relationship between the level of anthropogenic activity and microplastic contamination of surface water. Moreover, the composition of microplastics in surface water and atmospheric deposition were similar, comprising mostly polyester and acrylic fibers. Together, these results suggest that atmospheric deposition may be the main pathway of microplastics to these remote boreal lakes. Environ Toxicol Chem 2024;43:999-1011. © 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
(© 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.)
Databáze: MEDLINE
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