Polyester microfiber impacts on coastal sediment organic matter consumption

Area of Science:

• Marine Biology
• Environmental Science
• Ecosystem Ecology

Background:

• Seafloor plastic pollution, particularly microfibers, poses a growing threat to benthic ecosystems.
• Benthic ecosystem functionality, including organic matter consumption, is crucial for marine environments.

Purpose of the Study:

• To investigate the impact of polyester microfibers on seafloor organic matter consumption rates.
• To understand how microplastic contamination affects benthic ecosystem processes.

Main Methods:

• A field-based assay was employed to measure organic matter loss.
• Experiments were conducted with and without polyester microfiber contamination to compare consumption rates.

Main Results:

• Polyester microfibers altered organic matter cycling dynamics and decoupled ecosystem relationships.
• Sediment organic matter, mud content, and mean grain size were key drivers of consumption.
• Consumption rates and plastic effects varied with spatial heterogeneity (horizontal and vertical).

Conclusions:

• Habitat heterogeneity plays a critical role in seafloor organic matter consumption.
• Plastic pollution significantly impacts benthic ecosystem functions, with effects modulated by environmental conditions.