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Microplastic contamination in Lake Winnipeg, Canada.
Philip J Anderson1, Sarah Warrack2, Victoria Langen3
1IISD-Experimental Lakes Area, 111 Lombard Ave. Suite 325, Winnipeg, MB R3B 0T4, Canada.
Environmental Pollution (Barking, Essex : 1987)
|April 5, 2017
Summary
Microplastic contamination is widespread in Lake Winnipeg, with densities comparable to or exceeding those in the Great Lakes. Most detected plastics were fibers, highlighting a significant environmental concern in freshwater ecosystems.
Area of Science:
- Environmental Science
- Aquatic Ecology
- Contaminant Analysis
Background:
- Microplastics represent a growing concern in aquatic environments worldwide.
- Understanding microplastic pollution in large freshwater bodies is crucial for ecological health.
- Lake Winnipeg, a major North American freshwater lake, lacked prior microplastic contamination data.
Purpose of the Study:
- To quantify microplastic densities in Lake Winnipeg surface waters.
- To characterize the types and origins of microplastics found.
- To compare contamination levels with other major freshwater systems.
Main Methods:
- Water sampling conducted between 2014 and 2016.
- Microplastic identification using microscopy and spectroscopy (SEM-EDX).
- Analysis of particle origin (primary vs. secondary) and type (e.g., fibers).
Main Results:
- Lake Winnipeg exhibits microplastic densities similar to or greater than the Laurentian Great Lakes.
- Microplastics were predominantly secondary in origin, mainly as fibers.
- Higher densities were observed in the north basin in 2014, but lake-wide means were consistent across years.
- 23% of analyzed particles were misidentified and not plastic.
Conclusions:
- Microplastic contamination is prevalent in Lake Winnipeg, even in sparsely populated regions.
- The findings establish a baseline for future monitoring and risk assessment of microplastics in large freshwater lakes.
- Further research is needed to understand the ecological impacts of these contaminants.