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dc.contributor.authorBarrows, Abigail P.
dc.contributor.authorChristiansen, Katie S.
dc.contributor.authorBode, Emma T.
dc.contributor.authorHoellein, Timothy J.
dc.identifier.citationBarrows, Abigail P., Katie S. Christiansen, Emma T. Bode, and Timothy J. Hoellein. "A watershed-scale, citizen science approach to quantifying microplastic concentration in a mixed land-use river." Water Research 147 (December 2018): 382-392. DOI:10.1016/j.watres.2018.10.013.en_US
dc.description.abstractMicroplastic (particles < 5 mm) pollution dynamics are well documented in oceans and increasingly studied in freshwater. We used a watershed-scale approach to examine spatial and temporal patterns in microplastic concentrations in the Gallatin River watershed (Montana, USA). At 72 sites, trained volunteers collected ∼1-L grab samples at 4 seasons per year over 2 years (n = 714 samples). Microplastics were found in 57% of the samples (mean = 1.2 particles L−1). The majority of particles were fibers (80%), 0.1–1.5 mm long. Chemical identification determined 93% of particles measured by μFT-IR were synthetic or semi-synthetic materials. Microplastic concentration differed significantly among dates, but showed no longitudinal pattern or relationship to land-use among subwatersheds. At two sites with gaging stations, microplastic was negatively related to discharge when compared across dates. This suggests stormwater is not a source of microplastic in this watershed, but instead dilutes microplastic inputs from other sources. We conclude that microplastic sources are diverse, and measurements of microplastic deposition, resuspension, and transport may be needed to clarify the role of land-use patterns on microplastic pollution. This large scale, citizen science based approach provides a model for future analysis which can further expand microplastic collection at the watershed scale.en_US
dc.description.sponsorshipRoger and Rosemary Enrico Foundation; US Bank National Association; Yellowstone Club Community Foundation; Bozeman Area Community Foundation; Patagonia; Klean Kanteen; The Dorothy Jordan Chadwick Fund; Adventure Scientists; Crutcher Family Foundationen_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.titleA watershed-scale, citizen science approach to quantifying microplastic concentration in a mixed land-use riveren_US
mus.citation.journaltitleWater Researchen_US
mus.identifier.categoryChemical & Material Sciencesen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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