Widespread microplastic pollution in Indiana, USA, rivers

被引:7
作者
Conard, Whitney M. [1 ]
O'Reilly, Katherine E. [1 ]
Hartlage, Carson [1 ]
Lamberti, Gary A. [1 ]
机构
[1] Univ Notre Dame, Dept Biol Sci, 100 Galvin Life Sci, Notre Dame, IN 46556 USA
关键词
agriculture; forest; plastic; stream; urban; watershed; MARINE-ENVIRONMENT; SURFACE WATERS; PLASTIC DEBRIS; INGESTION; IDENTIFICATION; CONSEQUENCES; STREAMS; FIBERS;
D O I
10.1002/rra.4204
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Microplastics (i.e., plastic particles <5 mm in size) are aquatic contaminants of emerging concern but are poorly quantified in flowing waters of the midwestern USA. Microplastics enter streams and rivers through a variety of pathways (e.g., wastewater effluent, breakdown of larger plastic debris, atmospheric deposition) and can potentially harm aquatic organisms through both direct consumption and indirect contamination from sorbed toxins. In this study, we quantified microplastic concentrations and types (i.e., beads, fibers, films, foams, fragments) in nine Indiana watersheds representing a gradient of dominant land use (i.e., agricultural, urban, and forested). We predicted that microplastic concentration would be higher in watersheds with higher percentages of urban and agricultural land use than in forested watersheds. Our results revealed measurable quantities of microplastics in samples from all watersheds, but microplastic concentration did not vary significantly with land use or longitudinally within watersheds. Fibers were the dominant form of microplastic at all sites, suggesting that fibers may be transported primarily through atmospheric deposition rather than via direct runoff from the surrounding landscape. We conclude that rivers have a different microplastic "signature" than large lakes, likely due to retention characteristics of flowing water ecosystems, unique microplastic sources, and a shorter legacy of microplastic pollution.
引用
收藏
页码:2092 / 2101
页数:10
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