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Microplastics -- Environmental aspects, Microplastics -- Measurement, Microplastics -- Oregon -- Analysis


Microplastics are an ecological stressor with implications for ecosystem and human health when present in seafood. We quantified microplastic types, concentrations, anatomical burdens, geographic distribution, and temporal differences in Pacific oysters (Crassostrea gigas) and Pacific razor clams (Siliqua patula) from 15 Oregon coast, U.S.A. sites. Organisms were chemically digested and visually analyzed for microplastics, and material type was determined using Fourier Transform Infrared Spectroscopy. Microplastics were present in organisms from all sites. On average, whole oysters and razor clams contained 10.95 ± 0.77 and 8.84 ± 0.45 microplastic pieces per individual, or 0.35 ± 0.04 and 0.16 ± 0.02 pieces g-1 tissue, respectively. Contamination was quantified but not subtracted. Over 99% of microplastics were fibers. Spring samples contained more microplastics than summer in oysters but not razor clams. This study provides a spatially extensive baseline of microplastics in Oregon bivalves and is the first to determine Pacific razor clam concentrations.


The metadata template is available for download.

The data supports a manuscript published in Baechler, Granek, E. F., Hunter, V. M., & Conn, K. E. (2019). Microplastic Concentrations in Two Oregon Bivalve Species: Spatial, Temporal, and Species Variability. Limnology and Oceanography Letters. The article is available in PDXScholar and can be found here:

Data Description:
The dataset is the biological and microplastics data for Oregon Pacific razor clams and Pacific oysters.

Video & Photos
Video on Microplastics in Razor Clams and Oysters is available here:




Persistent Identifier

MP_Data_Baechler et al_2019.csv (49 kB)
Microplastics data for each clam, oyster, or control sample