Bioturbation transports secondary microplastics to deeper layers in soft marine sediments of the northern Baltic Sea

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http://hdl.handle.net/10138/307417

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Näkki, P., Setälä, O., Lehtiniemi, M. 2019. Bioturbation transports secondary microplastics to deeper layers in soft marine sediments of the northern Baltic Sea. Marine Pollution Bulletin 119 (1): 255-261. http://dx.doi.org/10.1016/j.marpolbul.2017.03.065

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Title: Bioturbation transports secondary microplastics to deeper layers in soft marine sediments of the northern Baltic Sea
Author: Näkki, Pinja; Setälä, Outi; Lehtiniemi, Maiju
Date: 2019-11-25
Belongs to series: Marine Pollution Bulletin 119 (1): 255-261
ISSN: 0025-326X
URI: http://hdl.handle.net/10138/307417
Abstract: Microplastics (MPs) are observed to be present on the seafloor ranging from coastal areas to deep seas. Because bioturbation alters the distribution of natural particles on inhabited soft bottoms, a mesocosm experiment with common benthic invertebrates was conducted to study their effect on the distribution of secondary MPs (different-sized pieces of fishing line < 1 mm). During the study period of three weeks, the benthic community increased MP concentration in the depth of 1.7-5.1 cm in the sediment. The experiment revealed a clear vertical gradient in MP distribution with their abundance being highest in the uppermost parts of the sediment and decreasing with depth. The Baltic clam Macoma balthica was the only study animal that ingested MPs. This study highlights the need to further examine the vertical distribution of MPs in natural sediments to reliably assess their abundance on the seafloor as well as their potential impacts on benthic communities.
Subject: microplastic
ingestion
Macoma balthica
Monoporeia affinis


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