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Microplastic retention by marine vegetated canopies: Simulations with seagrass meadows in a hydraulic flume
2021 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 269, p. 116050-116050, article id 116050Article in journal (Refereed) Published
Abstract [en]

Marine canopies formed by seagrass and other coastal vegetated ecosystems could act as sinks of microplastics for being efficient particle traps. Here we investigated for the first time the occurrence of microplastic retention by marine canopies in a hydraulic flume under unidirectional flow velocities from 2 to 30 cm s−1.

We used as model canopy-forming species the seagrass Zostera marina with four canopy shoot density (0, 50, 100, 200 shoots m−2), and we used as microplastic particles industrial pristine pellets with specific densities from 0.90 to 1.34 g cm−3 (polypropylene PP; polystyrene PS; polyamide 6 PA; and polyethylene terephthalate PET). Overall, microplastics particles transported with the flow were retained in the seagrass canopies but not in bare sand. While seagrass canopies retained floating microplastics (PP) only at low velocities (<12 cm s−1) due to a barrier created by the canopy touching the water surface, the retention of sinking particles (PS, PA, PET) occurred across a wider range of flow velocities.

Our simulations revealed that less dense sinking particles (PS) might escape from the canopy at high velocities, while denser sinking particles can be trapped in scouring areas created by erosive processes around the eelgrass shoots. Our results show that marine canopies might act as potential barriers or sinks for microplastics at certain bio-physical conditions, with the probability of retention generally increasing with the seagrass shoot density and polymer specific density and decreasing with the flow velocity.

We conclude that seagrass meadows, and other aquatic canopy-forming ecosystems, should be prioritized habitats in assessment of microplastic exposure and impact on coastal areas since they may accumulate high concentration of microplastic particles that could affect associated fauna.

Place, publisher, year, edition, pages
Elsevier BV , 2021. Vol. 269, p. 116050-116050, article id 116050
National Category
Environmental Sciences
Research subject
Environmental data
Identifiers
URN: urn:nbn:se:ivl:diva-3903DOI: 10.1016/j.envpol.2020.116050OAI: oai:DiVA.org:ivl-3903DiVA, id: diva2:1629987
Funder
European CommissionAvailable from: 2022-01-19 Created: 2022-01-19 Last updated: 2022-01-19

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Krång, Anna-Sara
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
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  • de-DE
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