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Related Experiment Video

Updated: Jun 24, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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Plastic pollution affects ecosystem processes including community structure and functional traits in large rivers.

Veronica Nava1, Barbara Leoni1, Monica M Arienzo2

  • 1Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza 1, 20126 Milano MI, Italy.

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Summary

Plastic debris in rivers creates a

Keywords:
BiodiversityCarbon cyclingEcosystem productivityMetabolismMicrobial and Microalgal communityPhotoheterotrophyPlastic debrisPlastisphere

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Area of Science:

  • Aquatic ecology
  • Environmental microbiology
  • Polymer science

Background:

  • Plastic debris in aquatic ecosystems rapidly forms biofilms, creating a novel habitat known as the 'plastisphere.'
  • The ecological impact of the plastisphere on ecosystem traits, including biodiversity and metabolic function, remains underquantified.
  • Comparative studies on how different plastic states affect ecosystem responses are scarce.

Purpose of the Study:

  • To quantify the impact of plastic biofilms on algal biomass, bacterial and algal biodiversity, and metabolic functions in riverine ecosystems.
  • To assess how colonized plastics influence ecosystem production, respiration, and biogeochemical cycles (nitrogen, phosphorus, carbon, oxygen).
  • To investigate the role of environmental conditions in shaping plastisphere community composition.

Main Methods:

  • Incubation of different plastic polymers in rivers of the Lower Mekong Basin, characterized by high plastic pollution.
  • Quantification of algal biomass and microbial biodiversity using 16S and 18S rRNA sequencing.
  • Measurement of ecosystem production, dark respiration, and changes in water chemistry (oxygen, nutrients, carbon).

Main Results:

  • Biofouled plastics led to a significant decrease in dissolved oxygen, inducing hypoxic/anoxic conditions in river water.
  • Bacterial communities dominated the plastisphere, with the presence of potential pathogens.
  • Community composition was significantly influenced by river location, indicating the importance of environmental factors.

Conclusions:

  • The plastisphere significantly alters aquatic ecosystem metabolism and biogeochemical cycling.
  • Plastic pollution, particularly in areas with poor waste management, has a substantial ecosystem-altering impact.
  • The plastisphere acts as a biologically active habitat, necessitating focused research in sensitive freshwater environments like the Mekong River.