Related Experiment Video
Updated: Jul 16, 2026
10:16
Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
Published on: December 16, 2016
Tidal Rhythm Regulates the Adverse Outcome Pathways of Microplastics on Coastal Microbial Mat Multifunctionality.
Yan Song1, Kailun Sun2, Xingpan Guo1
1State Key Laboratory of Estuarine and Coastal Research, Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China.
Environmental Science & Technology
|July 14, 2026
Summary
Coastal microplastic pollution impacts microbial mats differently. Nondegradable polyethylene (PE) harms diversity and enzyme activity, while degradable polylactic acid (PLA) disrupts microbial functions, with tidal cycles worsening effects.
Area of Science:
- Environmental Science
- Microbiology
- Ecotoxicology
Background:
- Coastal microbial mats are vital ecosystems at the sediment-seawater-atmosphere interface.
- Microplastic pollution poses increasing risks, but its effects on microbial mats under tidal influence are unclear.
Purpose of the Study:
- To investigate the differential impacts of polyethylene (PE) and polylactic acid (PLA) microplastics on coastal microbial mats.
- To assess the influence of simulated long-term tidal cycles on these microplastic-microbial mat interactions.
Main Methods:
- A simulation platform was used to model 180 tidal cycles.
- Differential impacts of PE (nondegradable) and PLA (degradable) microplastics were analyzed on microbial mat species richness, evenness, and key enzyme activities (nitrate reductase, urease, phosphatase, catalase).
- Metabolic signatures and microbial behaviors (migration, niche adaptation) were assessed under microplastic exposure and tidal fluctuations.
Main Results:
- PE (50 mg/kg) reduced species richness and inhibited nitrate reductase and urease activities.
- PLA dose-dependently inhibited phosphatase and catalase activities.
- Tidal cycles exacerbated PLA's negative effects, promoting microbe migration and niche narrowing, while disturbing phosphorus mineralization and redox homeostasis.
Conclusions:
- Microplastic type significantly influences coastal microbial mat responses.
- Tidal dynamics play a crucial role in mediating microplastic ecological risks, often exacerbating negative impacts.
- Dynamic environmental factors must be integrated for accurate coastal microplastic risk assessment.
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