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Related Experiment Video

Updated: Feb 14, 2026

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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Environmentally relevant microplastic exposure affects sediment-dwelling bivalves.

Agathe Bour1, Ane Haarr1, Steffen Keiter2

  • 1Department of Biosciences, University of Oslo, Blindernveien 31, 0371 Oslo, Norway.

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Summary

Microplastic pollution impacts marine sediment-dwelling bivalves by altering their energy reserves. Larger particles and higher concentrations of microplastics led to more severe effects on these important benthic organisms.

Keywords:
Benthic bivalvesEcotoxicityEnergy reservesEnvironmental conditionsPolyethylene

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Area of Science:

  • Marine Biology
  • Ecotoxicology
  • Environmental Science

Background:

  • Microplastics accumulate in marine sediments, posing a threat to benthic organisms.
  • The ecotoxicological effects of microplastics on sediment-dwelling bivalves are poorly understood.

Purpose of the Study:

  • To investigate the long-term impact of polyethylene microplastic exposure on two sediment-dwelling bivalve species, Ennucula tenuis and Abra nitida.
  • To determine the influence of microplastic concentration and size on bivalve ecotoxicity.

Main Methods:

  • Bivalves were exposed to polyethylene microparticles (4-6 μm, 20-25 μm, 125-500 μm) at concentrations of 1, 10, and 25 mg/kg sediment for four weeks.
  • Survival, condition index, burrowing behavior, and energy reserves (protein, carbohydrate, lipid) were assessed.

Main Results:

  • Microplastic exposure did not affect bivalve survival, condition index, or burrowing behavior.
  • Significant changes in energy reserves were observed, with total energy decreasing dose-dependently with larger particle sizes in E. tenuis.
  • A. nitida showed decreased protein content with larger particle sizes across all concentrations.

Conclusions:

  • Microplastic concentration and particle size significantly influence impacts on bivalves, with larger particles and higher concentrations causing more severe effects.
  • Long-term exposure to microplastics at environmentally relevant concentrations can negatively impact marine benthic biota, particularly energy reserves.