TY - JOUR T1 - Microplastic abundance and distribution in the open water and sediment of the Ottawa River, Canada, and its tributaries AU - Vermaire, Jesse C. AU - Pomeroy, Carrington AU - Herczegh, Sofia M. AU - Haggart, Owen AU - Murphy, Meaghan Y1 - 2017/01/01 PY - 2017 DA - 2017/01/01 N1 - doi: 10.1139/facets-2016-0070 DO - 10.1139/facets-2016-0070 T2 - FACETS JF - FACETS SP - 301 EP - 314 VL - 2 PB - Canadian Science Publishing N2 - Microplastic pollution is prevalent in the Ottawa River, with all open water samples (n?=?62) and sediment samples (n?=?10) containing microplastics. The median microplastic concentration of nearshore 100 L water samples was 0.1 fragments per L (ranged between 0.05 and 0.24 fragments per L). The larger volume Manta trawls samples taken in the middle of the Ottawa River had an overall mean concentration of plastics of 1.35 fragments per m3. Plastic concentrations were significantly higher downstream of the wastewater treatment plant (1.99 fragments per m3) compared with upstream of the effluent output (0.71 fragments per m3), suggesting that the effluent plume is a pathway for plastic pollution to the Ottawa River. The mean concentration of microplastic fragments recovered in the sediment samples was 0.22 fragments per g dry weight. The abundance of microplastics in the sediment was not significantly related to the mean particle size or the organic content of the sediment. The most common form of plastic particles found was microfibers. These made up between 70% and 100% of all plastic particles observed, although plastic microbeads and secondary plastic fragments were also recovered. AB - Microplastic pollution is prevalent in the Ottawa River, with all open water samples (n?=?62) and sediment samples (n?=?10) containing microplastics. The median microplastic concentration of nearshore 100 L water samples was 0.1 fragments per L (ranged between 0.05 and 0.24 fragments per L). The larger volume Manta trawls samples taken in the middle of the Ottawa River had an overall mean concentration of plastics of 1.35 fragments per m3. Plastic concentrations were significantly higher downstream of the wastewater treatment plant (1.99 fragments per m3) compared with upstream of the effluent output (0.71 fragments per m3), suggesting that the effluent plume is a pathway for plastic pollution to the Ottawa River. The mean concentration of microplastic fragments recovered in the sediment samples was 0.22 fragments per g dry weight. The abundance of microplastics in the sediment was not significantly related to the mean particle size or the organic content of the sediment. The most common form of plastic particles found was microfibers. These made up between 70% and 100% of all plastic particles observed, although plastic microbeads and secondary plastic fragments were also recovered. 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