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Microplastics in the insular marine environment of the Southwest Indian Ocean carry a microbiome including antimicrobial resistant (AMR) bacteria: A case study from Reunion Island
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Researchers studied the microbial communities growing on microplastics collected from the waters around Reunion Island in the Indian Ocean. They found that these plastic-associated microbiomes included bacteria carrying antimicrobial resistance genes, which differ from what is typically found in the surrounding seawater. The findings highlight that ocean microplastics can serve as floating platforms for potentially harmful, drug-resistant microbes even in remote island environments.
The increasing threats to ecosystems and humans from marine plastic pollution require a comprehensive assessment. We present a plastisphere case study from Reunion Island, a remote oceanic island located in the Southwest Indian Ocean, polluted by plastics. We characterized the plastic pollution on the island's coastal waters, described the associated microbiome, explored viable bacterial flora and the presence of antimicrobial resistant (AMR) bacteria. Reunion Island faces plastic pollution with up to 10,000 items/km in coastal water. These plastics host microbiomes dominated by Proteobacteria (80 %), including dominant genera such as Psychrobacter, Photobacterium, Pseudoalteromonas and Vibrio. Culturable microbiomes reach 10 CFU/g of microplastics, with dominance of Exiguobacterium and Pseudomonas. Plastics also carry AMR bacteria including β-lactam resistance. Thus, Southwest Indian Ocean islands are facing serious plastic pollution. This pollution requires vigilant monitoring as it harbors a plastisphere including AMR, that threatens pristine ecosystems and potentially human health through the marine food chain.
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Microplastics in the insular marine environment of the Southwest Indian Ocean carry a microbiome including antimicrobial resistant (AMR) bacteria: A case study from Reunion Island
AI summary Read the abstract
Researchers assessed plastic pollution along the coast of Reunion Island in the Southwest Indian Ocean and analyzed the microbial communities living on the microplastics. They found up to 10,000 plastic items per square kilometer, predominantly polyethylene and polypropylene, harboring dense bacterial communities including pathogenic Vibrio species and antibiotic-resistant bacteria. The study raises concerns about marine microplastics serving as vectors for spreading antimicrobial resistance in island marine environments.
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Researchers found that microplastic surfaces in coral reef waters selectively collect bacteria carrying antibiotic resistance genes, with the concentration of resistant bacteria linked to antibiotic levels in the surrounding water. The bacterial communities on microplastics were enriched for disease-related pathways compared to the surrounding seawater. This means microplastics in marine environments could serve as vehicles for spreading drug-resistant infections, posing risks to both coral ecosystems and human health.
Microplastics host distinct microbial communities enriched in potentially pathogenic taxa and antibiotic resistance genes: evidence from environmental and experimentally aged plastics in a coastal marine environment
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Scientists found that tiny plastic bits floating in the sea aren't just pollution, they're also rafts for germs, hosting different (and sometimes riskier) bacteria than the surrounding water, including *Vibrio*, a group that can cause food poisoning and infections. These plastic-riding bacteria also carried more genes for antibiotic resistance, including some tied to hard-to-treat infections, suggesting microplastics could help spread drug-resistant germs through the ocean and potentially into seafood or coastal waters people come into contact with.
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Researchers placed four types of common microplastics in a marine environment for over 100 days and found that bacterial communities and antibiotic resistance genes accumulated on the plastic surfaces over time. PVC microplastics were particularly effective at concentrating resistance genes, and a key gene-transfer element was found on all plastic types. These results show that microplastics floating in the ocean act as hotspots for antibiotic-resistant bacteria, which could eventually reach humans through seafood or water.
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Plastic trash on beaches isn't just an eyesore — it's also a floating home for bacteria, and this study found that these "plastic-dwelling" microbes carry more antibiotic-resistance genes and disease-causing traits than bacteria living on natural materials like driftwood or shells. This matters because as plastic pollution spreads through our oceans and coastlines, it may be helping harmful, drug-resistant bacteria hitch a ride and spread more easily into places where people swim, fish, and gather seafood.
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