Cited by 40Microplastics and Plastic PollutionPharmaceutical and Antibiotic Environmental ImpactsEnvironmental Toxicology and Ecotoxicology

Contrasting the effects of microplastic types, concentrations and nutrient enrichment on freshwater communities and ecosystem functioning

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Marchant, Danielle J., Martínez Rodríguez, Ana, Francelle, Pascaline, Jones, John Iwan, Kratina, Pavel·2023·Ecotoxicology and Environmental Safety

Abstract

Microplastics are now ubiquitous in freshwater environments. As most previous research has focused on species-specific effects of microplastics under controlled laboratory conditions, little is known about the impact of microplastics at higher levels of ecological organisation, such as freshwater communities and their associated ecosystem functions. To fill this knowledge gap, an outdoor experiment using 40 freshwater mesocosms, each 1.57 m3, was used to determine the effects of (i) microplastic type: traditional oil-based high-density polyethylene versus bio-based biodegradable polylactic acid, (ii) concentration of microplastic particles and (iii) nutrient enrichment. The two concentrations of microplastics used were equivalent to measured environmentally occurring concentrations and concentrations known to cause toxicological effects under laboratory conditions. Freshwater communities are also at increasing risk from nutrient enrichment, which can alter community composition in favour of competitively dominant taxa. The independent and interactive effects of these treatments on pelagic community structure (phytoplankton standing stock, taxonomic richness, and composition) and ecosystem functioning (periphyton productivity and leaf litter decomposition) were assessed. Taxonomic richness and community composition were not affected by exposure to the experimental treatments and there were no significant treatment effects on phytoplankton standing stock, periphyton productivity, total or microbial leaf litter decomposition. Overall, multiple microplastic exposures, crossed with nutrient addition had little impact on the structure and functioning of semi-natural freshwater ecosystems. These findings indicate that the negative impacts of microplastics predicted from species-specific studies may not be readily realised at the ecosystem scale.

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Crossref · 10.1016/j.ecoenv.2023.114834

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  • Our exposures of 10 and 50 microplastics/L are slightly higher than the average concentration reported in lake water in nature but significantly lower than the majority of published laboratory studies and lower than those used in other mesocosm studies.

    “Our exposures of 10 (low treatment) and 50 (high treatment) microplastics/L are slightly higher than the average concentration reported in lake water in nature but significantly lower than the majority of published laboratory studies (Bucci et al., 2020) and lower than those used in other mesocosm studies (Aljaibachi et al., 2020;Marchant et al., 2023;Yıldız et al., 2022).”

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Authors
Marchant, D. J., Martínez Rodríguez, A., Francelle, P., Jones, J. I., & Kratina, P.
Affiliations
Queen Mary University of London (GB)
Corresponding author
Marchant, Danielle J.
Venue
Ecotoxicology and Environmental Safety
Publisher
Elsevier BV
Published
2023-04
Volume
255
Pages
114834
ISSN
0147-6513 (ISSN-L)
OpenAlex
W4361027689
Cited by
40
References
90
Citations by year
2026: 8 · 2025: 11 · 2024: 15 · 2023: 6
FWCI
2.67
Type
journal article
Language
en
Open access
Locations
  • Ecotoxicology and Environmental Safety (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Queen Mary Research Online (Queen Mary University of London) (submittedVersion, cc-by)
Funders
  • European Union
  • European Regional Development Fund
  • Interreg
Topics
  • Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
Keywords
microplastics, freshwater ecosystems, nutrient enrichment, high-density polyethylene, polylactic acid, biodegradable plastics, microplastic concentration, phytoplankton, leaf litter decomposition, community structure, ecosystem functioning, mesocosm experiment, semi-natural ecosystems
MeSH terms
Microplastics, Fresh Water, Phytoplankton, Plastics, Water Pollutants, Chemical, Ecosystem

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