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. 2018 Dec:137:638-645.
doi: 10.1016/j.marpolbul.2018.10.061. Epub 2018 Nov 13.

Microplastic fiber uptake, ingestion, and egestion rates in the blue mussel (Mytilus edulis)

Madelyn N Woods  1 , Margaret E Stack  2 , David M Fields  3 , Susan D Shaw  2 , Patricia A Matrai  4
Affiliations

Microplastic fiber uptake, ingestion, and egestion rates in the blue mussel (Mytilus edulis)

Madelyn N Woods et al. Mar Pollut Bull. 2018 Dec.

Abstract

Microplastic fibers (MPF) are a ubiquitous marine contaminant, making up to 90% of global microplastic concentrations. Imaging flow cytometry was used to measure uptake and ingestion rates of MPF by blue mussels (Mytilus edulis). Mussels were fed a diet of Rhodomonas salina and MPF concentrations up to 30 MPF mL-1, or 0.374% of available seston. Filtration rates were greatly reduced in mussels exposed to MPF. Uptake of MPF followed a Holling's Type II functional response with 95% of the maximum rate (5227 MPF h-1) occurring at 13 MPF mL-1. An average of 39 MPF (SE ± 15, n = 4) was found in feces (maximum of 70 MPF). Most MPF (71%) were quickly rejected as pseudofeces, with approximately 9% ingested and <1% excreted in feces. Mussels may act as microplastic sinks in Gulf of Maine coastal waters, where MPF concentrations are near the order of magnitude as the experimental treatments herein.

Keywords: Bivalve; Filtration rate; Gulf of Maine; Microfiber; Microplastic; Seafood.

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