Terrestrial Isopods Generate Microplastics from Low-Density Polyethylene Without Effects on Survival

Area of Science:

• Environmental Science
• Ecotoxicology
• Soil Ecology

Background:

• Growing concern over microplastic (MP) pollution in terrestrial ecosystems.
• Invertebrates, like terrestrial isopods, may play a significant role in MP fate and transport.
• MPs enter soils via waste and biosolids, impacting ecosystem health.

Purpose of the Study:

• To investigate if three terrestrial isopod species ingest plastic debris and generate MPs.
• To determine if plastic ingestion affects isopod health.
• To assess the influence of plastic weathering on MP generation.

Main Methods:

• Exposed three isopod species (Porcellio scaber, P. laevis, P. pruinosus) to pristine and weathered polyethylene fragments.
• Varied exposure durations from 24 hours to 14 days.
• Monitored MP generation and assessed isopod health.

Main Results:

• All three isopod species ingested weathered plastic and generated MPs.
• MP generation increased with exposure duration, especially with weathered plastic.
• No adverse health effects were observed in isopods, but MP generation varied by species and size.

Conclusions:

• Terrestrial isopods contribute to microplastic generation in soil ecosystems.
• Isopod consumption of plastic fragments represents an additional pathway for MP exposure.
• Understanding invertebrate roles is crucial for managing MP pollution in terrestrial environments.