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Related Experiment Video

Updated: Aug 8, 2025

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

Do urban rivers in the amazon coast trap macroplastic?

G P Rosa¹, M S Costa¹, S M Monteiro¹

¹Laboratório de Pesquisa em Monitoramento Ambiental Marinho LAPMAR, Universidade Federal do Pará, Av. Augusto Corrêa s/n, Guamá, Belém, PA 66075-110, Brazil.

Marine Pollution Bulletin

|March 4, 2023

Summary

This study quantifies floating macroplastics in Amazon urban rivers, revealing significant seasonal variations and hydrodynamic influences. It estimates annual plastic transport into Guajará Bay, highlighting the need for in-situ data.

Keywords:

Amazon coast Macroplastic Urban centers Water discharge

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Last Updated: Aug 8, 2025

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

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Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

Published on: December 16, 2016

Area of Science:

Environmental Science
Oceanography
Ecology

Background:

Amazon Rivers are significant pathways for macroplastic pollution entering marine ecosystems.
Current macroplastic transport estimations often lack accuracy due to the omission of hydrodynamic factors and in-situ data.
Urban rivers in the Amazon basin contribute substantially to oceanic plastic loads.

Purpose of the Study:

To quantify floating macroplastics in the Acará and Guamá Rivers, Amazon urban rivers discharging into Guajará Bay.
To provide the first annual transport estimate of macroplastics considering temporal scales and local hydrodynamics.
To analyze the influence of river discharge and tidal stages on macroplastic distribution.

Main Methods:

Conducted visual observations of floating macroplastics (>2.5 cm) across various river discharges and tidal stages.
Measured current intensity and direction in the Acará, Guamá Rivers, and Guajará Bay.
Quantified macroplastic abundance and calculated annual transport rates based on in-situ measurements.

Main Results:

A total of 3481 floating macroplastics were quantified, with significant variations observed based on tidal cycles and seasonality.
The urban estuarine system exhibited an import rate of 12 tons/year of macroplastics via the Guamá River.
An export rate of 21.7 tons/year of macroplastics was recorded through Guajará Bay, influenced by local hydrodynamics.

Conclusions:

Local hydrodynamics significantly impact macroplastic transport dynamics within the Amazon urban estuarine system.
The study provides crucial in-situ data for more accurate macroplastic transport estimations in the Amazon basin.
Understanding these dynamics is vital for developing effective strategies to mitigate plastic pollution in marine environments.