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Microplastics in the Mississippi
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This poster study reviewed two research papers examining microplastics in the Mississippi River, finding that plastic concentrations increase downstream and in heavily populated areas, and that fish throughout the river system ingest microplastics reflecting their surrounding water contamination.
This poster explores the presence and impact of microplastics in the Mississippi River through the analysis of two research studies. The first study examined surface water samples to measure microplastic concentration and to assess how land use and geography influence their distribution along the river. The second study looks in on identifying microplastics in the digestive systems of fish collected from different locations along the river. Both studies have shown that microplastics are widespread throughout the river, with higher levels found downstream and in highly populated areas. The research highlights the ways in which microplastics enter freshwater environments, from urban runoff and wastewater to degraded consumer products, and how these pollutants can affect wildlife and humans. Fish are especially vulnerable, as microplastics accumulate in their stomach linings, potentially affecting their health and survival. The plastics can also work their way up the food chain, posing a possible risk to human health through the consumption of contaminated water or food. These findings stress the need for increased awareness and better waste practices. Reducing plastic usage, reusing materials, and improving disposal methods are all key steps in addressing this issue. By recognizing the sources and impacts of microplastics, we can begin to develop more sustainable habits and protect freshwater ecosystems. Senior Capstone for GEOG 454: Conservation and Sustainable Use of Natural Resources with Professor Gregory Vandeberg.
More Papers Like This
Identification and Quantification of Microplastic Pollution in Water Samples and Four Species of Fish from the Mississippi River
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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 Mississippi River Fishes: A Watershed Approach
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This study examined microplastic occurrence in fish from multiple locations along the Mississippi River watershed, finding widespread contamination across species. Researchers used a watershed-scale approach to understand how microplastics enter river food webs and accumulate in freshwater fish.
Microplastics in mainstem Mississippi River fishes
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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
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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
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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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.