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61,005 resultsShowing papers similar to Microplastics in the Mississippi
ClearIdentification and Quantification of Microplastic Pollution in Water Samples and Four Species of Fish from the Mississippi River
Microplastics were found in water samples and in four fish species from the Mississippi River, the largest North American river draining a densely populated watershed. The findings confirm that one of the world's major river systems is contaminated with microplastics, which are likely entering the Gulf of Mexico.
Microplastics in mainstem Mississippi River fishes
Researchers found microplastics in all four fish species sampled at all five sites along the mainstem Mississippi River, with polypropylene fragments being most common and occurrence increasing in the Lower Mississippi, though only Largemouth Bass showed a clear downstream increase in microplastic load.
Characterization and enumeration of microplastic pollution in three fish species of the Upper Mississippi River
Researchers found 891 microplastic particles across 281 fish from three species in the Upper Mississippi River, with fibers being the most common type and smaller fish containing proportionally more microplastics than larger ones. This confirms microplastic ingestion is widespread in freshwater fish — not just marine species — and the presence of styrene-isoprene, polyester, and ABS polymers highlights the diverse plastic sources contaminating major river systems.
Riverine microplastics and their interaction with freshwater fish
This paper reviews how microplastics enter river systems, how they move through waterways, and the risks they pose to freshwater fish. Researchers found that fish ingest microplastics that can accumulate in organs and carry toxic chemicals absorbed from the water. The review highlights that river fish, an important food source for many communities, face growing exposure to microplastics from urban runoff, wastewater, and agricultural sources.
Occurrence and characterization of microplastic content in the digestive system of riverine fishes
Researchers found microplastics in 93.8% of riverine fish examined, with polystyrene, polyethylene, and nylon being the most common polymer types concentrated near urban and industrial areas, and small particles (0.025-1 mm) predominating across species.
Microplastics in Aquatic Environments and Their Toxicological Implications for Fish
This review summarizes research on microplastic occurrence in freshwater and marine environments and the toxicological risks they pose to fish, examining both direct physical effects and the role of plastics as vectors for chemical pollutants. The authors highlight that freshwater fish are particularly vulnerable given the high loads of microplastics in rivers receiving wastewater.
Effect of microplastics pollution in riverine ecosystem: A review
This review covers microplastic contamination in riverine ecosystems, discussing the diverse forms of microplastics -- including threads, fragments, films, and pellets -- their ingestion by aquatic organisms, long-distance transport, and accumulation in sediments.
Tracing the invisible microplastics in river water and fish organs and its implication of riverine ecosystem integrity
Researchers analyzed microplastics in river water and fish organ tissues from a river in South Asia, finding contamination throughout the aquatic food web. The study used the plastisphere framework to discuss how microbial communities colonizing microplastics may influence particle fate and biological effects.
Occurrence and amount of microplastic ingested by fishes in watersheds of the Gulf of Mexico
Researchers quantified microplastic ingestion by fishes across several freshwater and estuarine watersheds of the Gulf of Mexico. The study documented widespread microplastic occurrence in fish from these environments, contributing important data about freshwater contamination at a time when most research had focused on marine ecosystems.
Microplastic pollution in aquatic environments with special emphasis on riverine systems: Current understanding and way forward
This review examines microplastic pollution in freshwater riverine systems, which serve as a critical link between terrestrial and marine environments. Researchers found that rivers are significantly contaminated with microplastics of varying sizes and morphologies, and that these particles can exhibit variable toxicity to aquatic organisms, highlighting the need for more research on freshwater microplastic impacts.
Assessment and accumulation of microplastics in the Indian riverine systems: Risk assessment and implications of translocation across the water-to-fish continuum
This review assessed microplastic pollution across Indian rivers and the fish that live in them, finding widespread contamination in both water and fish tissues. Microplastics were found to transfer from river water into fish organs including gills, gut, liver, and muscle tissue that people eat. Since Indian rivers support the livelihoods and food supply of hundreds of millions of people, this contamination pathway is a significant concern for human dietary exposure to microplastics.
Food ecology and presence of microplastic in the stomach content of neotropical fish in an urban river of the upper Paraná River Basin
Microplastics were found in the stomachs of multiple fish species in an urban Brazilian river, with ingestion rates linked to each species' feeding ecology. The findings confirm that microplastics have entered the freshwater food chain, raising concern about contamination reaching people who eat these fish.
Microplastics in Aquatic Ecosystems: A Critical Review of Sources, Transport Mechanisms and Ecotoxicological Risks
This review provides a broad overview of microplastic pollution in rivers, oceans, and other aquatic environments, covering where these particles come from, how they move through water systems, and the harm they can cause. Evidence indicates that microplastics accumulate toxins and disrupt growth, feeding, and reproduction in aquatic species, with potential consequences for human health through seafood and drinking water. The authors stress the need for better global monitoring, stronger waste management systems, and development of eco-friendly plastic alternatives.
Characteristics, Contamination Levels, and Ecosystem Risk Assessment of Microplastics in Surface Water of a Highly Urbanized River from a Developing Country
Researchers characterized microplastic contamination in an urban river near a megacity in a developing country, finding concentrations of 350 to 660 particles per cubic meter of water. Polyethylene and polypropylene from household and municipal waste were the most common types, and a risk assessment found concerning contamination levels at several sampling sites. The study highlights how rivers in developing nations can serve as major pathways for microplastics to reach the ocean and enter the food chain.
Microplastics Are Contaminants of Emerging Concern in Freshwater Environments: An Overview
This overview examines the emerging problem of microplastic contamination in freshwater environments, covering sources, occurrence, and potential effects on aquatic ecosystems. The authors discuss how microplastics enter lakes and rivers through wastewater treatment plants, runoff, and degradation of larger plastic debris. The review highlights that freshwater microplastic pollution deserves the same research attention as marine contamination, given that rivers serve as major transport pathways for plastics reaching the ocean.
Microparticles in Wild and Caged Biota, Sediments, and Water Relative to Large Municipal Wastewater Treatment Plant Discharges
Researchers examined microplastic levels in fish, water, and sediment upstream and downstream of two large wastewater treatment plants along the Grand River in Ontario, Canada. Despite expectations, they did not find consistently higher microplastic levels in organisms living near wastewater outfalls compared to upstream sites. The findings suggest that microplastic contamination in rivers may come from many widespread sources rather than being dominated by wastewater discharge.
Ingestão e efeitos morfofisiológicos dos microplásticos em espécies de peixes da Amazônia Central
This Brazilian thesis investigates microplastic ingestion and its effects on fish from the Amazon basin, one of the world's most biodiverse freshwater systems. Given that aquatic organisms in even remote areas are exposed to microplastics, the research highlights risks to Amazon fish diversity and the potential for microplastics to disrupt aquatic food webs in previously pristine ecosystems.
Impacts of Microplastics as Contaminants in Freshwater Ecosystems and Human Food Chain
This review examines the impacts of microplastics on freshwater ecosystems and human food chains, tracing how plastic particles enter rivers and lakes, accumulate in fish and invertebrates, and transfer to humans through consumption of contaminated freshwater species.
Prevalence of microplastics in commonly consumed fish species of the river Old Brahmaputra, Bangladesh
Researchers found microplastics in nearly 59% of edible fish from Bangladesh's Old Brahmaputra river, with polyethylene fibers and pellets dominating, and ingestion rates linked to fish size, feeding behavior, and downstream location.
Microplastics- A not so Micro Problem: Prevalence in A North Caroline Freshwater System
Researchers investigated microplastic prevalence in the Catawba River Basin of North Carolina by collecting 80 water samples across five sites varying in recreation intensity and upstream/downstream position, finding microplastics present in every sample collected and documenting higher concentrations at downstream and recreated sites.
First evidence of microplastic ingestion by fishes from the Amazon River estuary
Researchers documented the first evidence of microplastic ingestion by fish in the Amazon River estuary, finding plastic particles — predominantly polyamide and polyethylene pellets — in 30% of 189 specimens across 14 species, with larger fish containing more particles, indicating widespread contamination extending into one of the world's most biodiverse river systems.
Microplastic in surface waters of urban rivers: concentration, sources, and associated bacterial assemblages
Researchers measured microplastic levels in the surface waters of the Chicago River and its urban tributaries, finding concentrations as high as 1.94 particles per cubic meter near wastewater outflows. They discovered that microplastic fibers and pellets were often colonized by bacterial communities distinct from those in the surrounding water. The study provides early evidence that urban rivers are significant conduits for microplastic pollution and that these particles may serve as rafts for microorganisms.
Microplastics as Emerging Contaminants: Challenges in Inland Aquatic Food Web
This review examines microplastic pollution in freshwater ecosystems like rivers, lakes, and reservoirs, finding that these particles accumulate through the food chain from plankton to fish. Since humans eat freshwater fish, microplastic contamination in inland waters represents a direct pathway for human exposure that has received less research attention than ocean pollution.
Microplastics in freshwater systems: A review on occurrence, environmental effects, and methods for microplastics detection
This review summarizes the current understanding of microplastic contamination in freshwater systems, from sources like wastewater treatment plants to their effects on aquatic life. Researchers note that microplastics can carry toxic chemicals and have been shown to cause intestinal damage and metabolic changes in fish. The paper highlights that freshwater microplastic pollution is a significant and growing concern that warrants more research attention.