Gathering at the top? Environmental controls of microplastic uptake and biomagnification in freshwater food webs

Stefan Krause*, Viktor Baranov, Holly A. Nel, Jennifer D. Drummond, Anna Kukkola, Timothy Hoellein, Gregory H. Sambrook Smith, Joerg Lewandowski, Berta Bonnet, Aaron I. Packman, Jon Sadler, Valentyna Inshyna, Steve Allen, Deonie Allen, Laurent Simon, Florian Mermillod-Blondin, Iseult Lynch

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

11 Scopus citations

Abstract

Microplastics are ubiquitous in the environment, with high concentrations being detected now also in river corridors and sediments globally. Whilst there has been increasing field evidence of microplastics accumulation in the guts and tissues of freshwater and marine aquatic species, the uptake mechanisms of microplastics into freshwater food webs, and the physical and geological controls on pathway-specific exposures to microplastics, are not well understood. This knowledge gap is hampering the assessment of exposure risks, and potential ecotoxicological and public health impacts from microplastics. This review provides a comprehensive synthesis of key research challenges in analysing the environmental fate and transport of microplastics in freshwater ecosystems, including the identification of hydrological, sedimentological and particle property controls on microplastic accumulation in aquatic ecosystems. This mechanistic analysis outlines the dominant pathways for exposure to microplastics in freshwater ecosystems and identifies potentially critical uptake mechanisms and entry pathways for microplastics and associated contaminants into aquatic food webs as well as their risk to accumulate and biomagnify. We identify seven key research challenges that, if overcome, will permit the advancement beyond current conceptual limitations and provide the mechanistic process understanding required to assess microplastic exposure, uptake, hazard, and overall risk to aquatic systems and humans, and provide key insights into the priority impact pathways in freshwater ecosystems to support environmental management decision making.

Original languageEnglish (US)
Article number115750
JournalEnvironmental Pollution
Volume268
DOIs
StatePublished - Jan 1 2021

Keywords

  • Exposure
  • Fate
  • Food web
  • Freshwater
  • Microplastic

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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