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Microplastic pollution in the Amazon Basin: Current scenario, advances and perspectives
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Researchers reviewed all available studies on microplastic pollution in the Amazon Basin and found that contamination is widespread despite limited research, with only four of the nine basin countries having published data. Microplastic levels in some Amazon waterways were comparable to heavily industrialized regions like China's Yellow River, with poor sanitation infrastructure and extensive river networks acting as key factors. The study highlights major gaps in monitoring across large portions of the Amazon and calls for coordinated regional research efforts.
The presence of microplastics (MPs) has been reported in ecosystems in the most different regions of the world and rivers have been identified as one of the main means of transporting this debris to oceans. Recent research shows microplastic deposition and accumulation in the Amazon Basin and, despite being scarce, microplastic pollution is ubiquitous in the region. Of the 9 countries that make up the Amazon Basin, only Brazil, Guyana, Ecuador and Peru have published on the topic, with the main focus on biota (58 %). Several Amazon regions such as Northern Amazon in the Far North of Brazil still have no evidence of microplastic pollution with published data. MP abundance ranges from 5 to 74,500 MPs m for waters, 0 to 8178 MPs kg for sediment and 0.34 to 38.3 MPs individual for biota, with nanoplastic scale (<100 μm) in the sediment. Blue and colorless are the predominant colors, mainly from secondary sources (fibers and fragments). The most commonly found polymers are polyamide, polyethyleneterephthalate and polypropylene. Microplastic abundance in aquatic systems is higher than that found in other rivers, such as the Guayas in Ecuador, the Magdalena, in Colombia and the Surabaya in Indonesia and are similar to regions with intense anthropogenic activity such as the Guanabara Bay - Brazil and the Yellow River in China. The precarious basic sanitation structure, urban planning, waste management, combined with the extensive network of navigable waters, are aggravating factors for the increase in plastic pollution in the region. It is necessary to increase research investment on the topic, considering MP quantification, impacts and the relationship with the hydrosedimentological dynamics of the Amazon Basin. The creation and enforcement of laws that minimize the accumulation of these materials is emerging, besides the development of the bioeconomy and sustainable proposals to minimize plastic pollution in the Amazon.
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Microplastics in the Amazon biome: State of the art and future priorities
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This review examines microplastic pollution in the Amazon region and finds contamination levels comparable to heavily polluted areas worldwide. Poor sanitation is a major source, with fibers being the most common particle type found in water, sediment, and wildlife. Despite the Amazon's global ecological importance, research on microplastics there has been very limited, and the authors call for urgent expansion of scientific monitoring.
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Scientists found tiny plastic particles, mostly microscopic fibers, scattered throughout the water and riverbed of a major Amazon river in Brazil, with pollution levels staying consistently high across all tested locations. This suggests plastic waste from clothing, tires, and city runoff is a widespread, ongoing problem, not just isolated pollution spots, raising concerns since people drink from and eat fish from rivers like this one.
Large-scale monitoring and risk assessment of microplastics in the Amazon River
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Researchers conducted the largest microplastic monitoring study in the Amazon River, sampling 40 sites across 1,500 kilometers. Microplastics were found everywhere, with urban streams near cities showing concentrations up to 1,000 times higher than the main river. This study confirms that even remote freshwater ecosystems like the Amazon are contaminated with microplastics, which could affect the fish and water that local communities depend on.
Microplastics in tropical Andean rivers: A perspective from a highly populated Ecuadorian basin without wastewater treatment
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Researchers measured microplastic concentrations in a highly populated Ecuadorian river basin that lacks wastewater treatment, finding contamination throughout the system and demonstrating that rivers in low-income tropical countries with poor infrastructure are major conduits for microplastics.
Plastic pollution in the Amazon: The first comprehensive and structured scoping review
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This scoping review is the first systematic assessment of plastic pollution across Amazonian ecosystems, analyzing 52 peer-reviewed studies. Researchers found microplastics in fish, sediments, plants, and diverse wildlife, but noted major gaps in coverage of non-fish species, tributaries, and countries beyond Brazil. The study warns that contamination of key food and water sources poses significant health risks for traditional populations living in the Amazon basin.
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