Seafloor sediments as microplastic sinks in the northern Baltic Sea: Negligible upward transport of buried microplastics by bioturbation

Pinja Näkki, Outi Setälä, Maiju Lehtiniemi

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

Microplastics (MPs) are ubiquitous in the marine environment. High concentrations of MPs are found from seafloor sediments, which have been proposed to act as their final sinks. Because bioturbation is an important process affecting the burial of MPs, a mesocosm experiment was established to study whether sediment infauna may also promote MP return to the sediment surface. Thin layers of frozen sediment containing an environmentally realistic concentration (500 μm and 100–300 μm) were added to depths of 2 cm and 5 cm in the experimental cylinders filled with sediment. The displacement of these MPs, made of acrylonitrile butadiene styrene (ABS), by a community of common benthic invertebrates in the northern Baltic Sea (clam Limecola balthica, polychaete Marenzelleria spp., gammarid Monoporeia affinis) was studied in a 10-week experiment. After the experiment, the MPs were extracted from each sediment layer and the animals were examined for MP ingestion. The results indicated that the transportation of MPs to the sediment surface by bioturbation was negligible. Thus, in the Baltic Sea, the seafloor may act as a sink for once sedimented MPs, reducing simultaneously the MP exposure of the macrofauna feeding on the sediment surface.
Originalspråkengelska
TidskriftEnvironmental Pollution
Volym249
Sidor (från-till)74-81
Antal sidor8
ISSN0269-7491
DOI
StatusPublicerad - juni 2019
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1172 Miljövetenskap

Citera det här