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Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Environmental Sources Marine & Wildlife Sign in to save

Seagrass beds reveal high abundance of microplastic in sediments: A case study in the Baltic Sea

Marine Pollution Bulletin 2021 55 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count.
Randel Kreitsberg, Merilin Raudna-Kristoffersen, Margit Heinlaan, Raymond D. Ward, Meeri Visnapuu, Vambola Kisand, Richard Meitern, Jonne Kotta, Arvo Tuvikene

Summary

Seagrass bed sediments in the Baltic Sea were found to harbor significantly higher microplastic concentrations than surrounding bare sediments, indicating that seagrass canopies trap and accumulate microplastics and may be underappreciated hotspots of contamination.

Study Type Environmental

Microplastic (MPL) contamination in the marine environment is extensively studied yet little is known about the extent of MPL abundance in seagrass beds. The aim of this study was to evaluate MPL accumulation in coastal seagrass (Zostera marina) beds in the Baltic Sea, Estonia. Surface water was sampled by pumping using 40 μm plankton net, and sediments by trowel. MPL was extracted with NaCl, identified by microscopy and ATR-FTIR on selected samples. Surface water in the seagrass beds had 0.04-1.2 (median 0.14) MPL/L, similar to other areas of the Baltic Sea. Sediments had 0-1817 (median 208) MPL/kg (dwt), much higher than previously recorded from adjacent unvegetated and offshore sediments, thereby suggesting a strong ability of the sediments in seagrass beds to retain MPL. Of identified MPL, blue fibres were dominant in both the sampled media. Sediment characterization showed a correlation between MPL counts with poorly sorted sediments.

Read via DOI PubMed

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