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Microplastics have lethal and sublethal effects on stream invertebrates and affect stream ecosystem functioning.

Naiara López-Rojo1, Javier Pérez1, Alberto Alonso1

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This summary is machine-generated.

Microplastics (MPs) harm freshwater ecosystems by increasing detritivore mortality and reducing leaf litter decomposition. These findings highlight the urgent need to understand MP impacts on aquatic life and ecosystem functions.

Keywords:
DetritivoresEcotoxicityFreshwater ecosystemsLitter decompositionPlastic

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Aquatic Ecology

Background:

  • Microplastics (MPs) are pervasive environmental contaminants with unknown impacts on freshwater ecosystems.
  • Limited data exists on MP distribution, effects on freshwater organisms, and ecosystem functioning.

Purpose of the Study:

  • To investigate the effects of MPs on leaf litter decomposition and detritivore (Sericostoma pyrenaicum) populations in a microcosm experiment.
  • To assess MP ingestion, egestion, and trophic transfer mechanisms in freshwater invertebrates.

Main Methods:

  • A microcosm experiment exposed detritivores and leaf litter to varying concentrations of fluorescent polystyrene microspheres (10-μm).
  • Measured detritivore mortality, growth, and analyzed fluorescence for MP ingestion and egestion.
  • Quantified leaf litter decomposition rates under different MP concentrations and in the presence/absence of detritivores.

Main Results:

  • Microplastic exposure significantly increased detritivore mortality by up to ninefold at the highest concentration.
  • Detritivore growth was not affected, but MPs were ingested and egested, indicating trophic transfer.
  • Leaf litter decomposition rates decreased with increasing MP concentrations, particularly in the presence of detritivores.

Conclusions:

  • Microplastics pose a significant threat to freshwater aquatic insects and disrupt crucial ecosystem processes like decomposition.
  • Findings underscore the need for standardized methodologies in microplastic research to enable comparative studies and broader ecological assessments.