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Blueprint for the ideal microplastic effect study: critical issues of current experimental approaches and envisioning a path forward
Kotta, J.; Lenz, M.; Barboza, F.R.; Jänes, H.; Grande, P.A.D.; Beck, A.; Van Colen, C.; Hamm, T.; Javidpour, J.; Kaasik, A.; Pantó, G.; Szava-Kovats, R.; Orav-Kotta, H.; Lees, L.; Loite, S.; Canning-Clode, J.; Gueroun, S.K.M.; Kõivupuu, A. (2022). Blueprint for the ideal microplastic effect study: critical issues of current experimental approaches and envisioning a path forward. Sci. Total Environ. 838(Part 4): 156610. https://dx.doi.org/10.1016/j.scitotenv.2022.156610
In: Science of the Total Environment. Elsevier: Amsterdam. ISSN 0048-9697; e-ISSN 1879-1026
Peer reviewed article  
Available in  Authors 
    Vlaams Instituut voor de Zee: Open access 389675 [ download pdf ]
Author keywords
    Microplastics; Experiments; Ecological effects; meta-analysis
Authors  Top 
  • Kotta, J.
  • Lenz, M.
  • Barboza, F.R.
  • Jänes, H.
  • Grande, P.A.D.
  • Beck, A.
  • Van Colen, C.
  • Hamm, T.
  • Javidpour, J.
  • Kaasik, A.
  • Pantó, G.
  • Szava-Kovats, R.
  • Orav-Kotta, H.
  • Lees, L.
  • Loite, S.
  • Canning-Clode, J.
  • Gueroun, S.K.M.
  • Kõivupuu, A.
Abstract
    This article presents a novel conceptual blueprint for an ‘ideal’, i.e., ecologically relevant, microplastic effect study. The blueprint considers how microplastics should be characterized and applied in laboratory experiments, and how biological responses should be measured to assure unbiased data that reliably reflect the effects of microplastics on aquatic biota. This ‘ideal’ experiment, although practically unachievable, serves as a backdrop to improve specific aspects of experimental research on microplastic effects. In addition, a systematic and quantitative literature review identified and quantified departures of published experiments from the proposed ‘ideal’ design. These departures are related mainly to the experimental design of microplastic effect studies failing to mimic natural environments, and experiments with limited potential to be scaled-up to ecosystem level. To produce a valid and generalizable assessment of the effect of microplastics on biota, a quantitative meta-analysis was performed that incorporated the departure of studies from the ‘ideal’ experiment (a measure of experimental quality) and inverse variance (a measure of the study precision) as weighting coefficients. Greater weights were assigned to experiments with higher quality and/or with lower variance in the response variables. This double-weighting captures jointly the technical quality, ecological relevance and precision of estimates provided in each study. The blueprint and associated meta-analysis provide an improved baseline for the design of ecologically relevant and technically sound experiments to understand the effects of microplastics on single species, populations and, ultimately, entire ecosystems.
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