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Updated: Jul 23, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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The hyperbenthic environment: A forgotten habitat for plastic pollution.

V Fagiano1, M Compa2, C Alomar2

  • 1Centro Oceanográfico de Baleares (IEO, CSIC), Muelle de Poniente s/n, 07015 Mallorca, Spain; University of Balearic Islands, Palma de Mallorca, Spain.

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Summary

Microplastic pollution is high in seafloor sediments within a Mediterranean Marine Protected Area, with fibers being the most common type. This highlights an urgent need to address fiber pollution in marine ecosystems.

Keywords:
Benthic boundary layerFibersHyperbenthic environmentMicroplasticSediments

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Area of Science:

  • Marine Biology
  • Environmental Science
  • Oceanography

Background:

  • Microplastic (MP) contamination is a growing concern in marine ecosystems.
  • Understanding MP distribution across different marine environments is crucial for effective management.

Purpose of the Study:

  • To investigate the abundance and composition of microplastics in various marine compartments.
  • To assess MP distribution in a coastal Mediterranean Marine Protected Area (MPA).

Main Methods:

  • Sampling of seafloor sediments, hyperbenthic, and mid-water layers within the Cabrera MPA.
  • Analysis of microplastic abundance and polymer composition.
  • Investigation of sampling sites on patchy Posidonia oceanica meadows.

Main Results:

  • Seafloor sediments exhibited significantly higher MP abundances (378,769 MPs/m³) compared to hyperbenthic (209 MPs/m³) and mid-water layers (106 MPs/m³).
  • A vertical gradient of MP abundance was observed, increasing towards the seafloor.
  • Fibers constituted the dominant MP type, primarily composed of polystyrene (PS), expanded polystyrene (EPS), and cellulose acetate (CA).

Conclusions:

  • Seafloor sediments act as a significant sink for microplastics, particularly fibers.
  • The findings underscore the critical need for strategies to mitigate fiber pollution in the marine environment.