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Related Experiment Video

Updated: Jan 8, 2026

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

Published on: July 28, 2018

Beyond Abiotic Decay: Fiddler Crabs Accelerate Plastic Fragmentation in Pollution Hotspots.

José M Riascos^1,2, Daniela Díaz¹, Lina M Zapata-Restrepo³

¹Instituto de Ciencias del Mar, Universidad de Antioquia, Turbo, Colombia.

Global Change Biology

|December 17, 2025

Summary

Fiddler crabs ingest significant microplastics in polluted mangroves, with ingested plastics fragmenting and returning to sediment within 14 days. This highlights biotic fragmentation as a key pathway for plastic degradation in marine environments.

Keywords:

biological plastic degradation digestive fragmentation ecosystem engineers fiddler crabs microplastics plastic pollution pollution hotspots urban mangroves

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Last Updated: Jan 8, 2026

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

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Published on: January 6, 2023

Area of Science:

Marine Biology
Environmental Science
Ecotoxicology

Background:

Mangrove forests act as significant sinks for plastic pollution, especially in urbanized coastal areas.
Fiddler crabs (Minuca vocator), ecosystem engineers, inhabit these plastic-rich sediments and their role in plastic fate is understudied.

Purpose of the Study:

To investigate the uptake and fate of microplastics in fiddler crabs inhabiting polluted urban mangroves.
To determine the rate and mechanism of microplastic degradation within these crabs and their environment.

Main Methods:

Fluorescently labeled polyethylene microspheres (20-90 μm) were introduced into mangrove sediments.
Microplastic uptake and distribution in fiddler crabs (hepatopancreas, gills, hindgut) were tracked over 66 days.
Sediment samples were analyzed for microsphere presence and fragmentation.

Main Results:

91% of crabs (95 total) showed microplastic uptake, with highest concentrations in the hindgut and hepatopancreas.
Average crab uptake (48.67 microspheres/g) was over 16 times higher than sediment density (2.92 microspheres/g).
Fragmented microspheres were detected in sediment within 14 days, indicating rapid biotic degradation.

Conclusions:

Fiddler crabs accumulate high levels of microplastics, exceeding sediment concentrations significantly.
Biotic fragmentation by fiddler crabs is a crucial, rapid pathway for microplastic degradation, challenging long-held assumptions about abiotic aging.
These findings underscore the ecological role of fiddler crabs in processing ocean-bound plastics.