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Microbial Dynamics on Different Microplastics in Coastal Urban Aquatic Ecosystems: The Critical Roles of Extracellular Polymeric Substances
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Researchers investigated how microbial communities colonize different types of microplastics in urban coastal waters, forming distinct ecosystems known as plastispheres. They found that the type of plastic significantly shaped which bacteria grew on it and how much sticky extracellular material they produced. Understanding these microbial communities on microplastics matters because they can harbor harmful bacteria and influence how pollutants move through aquatic environments.
Microplastics (MPs) serve as carriers for microbial community colonization, forming unique ecosystems known as plastispheres in urban aquatic ecosystems. However, interactions among microbes, extracellular polymeric substances (EPS), and MPs remain poorly understood. This study investigates microbial consortia and their EPS secretion behaviors across various plastispheres at two representative coastal urban water sites. Permutational multivariate analysis of variance revealed that MP type significantly influenced microbial community structures in reservoir environments (R2 = 0.60, p < 0.001), highlighting the pronounced impact of MP types in high-quality urban waters. Specific microbial phyla and genera were identified as key contributors to EPS compositional variations across different plastispheres. Hierarchical partitioning results identified Acidobacteria, Nitrospirae, and Planctomycetes as influential phyla positively affecting EPS composition. Spearman correlation analysis pinpointed Robiginitialea (positive correlation) and Fimbriiglobus (negative correlation) as critical genera influencing EPS dynamics. Moreover, EPS-related gene abundance corresponded closely with observed EPS compositional differences. Dominant genes associated with protein biosynthesis included xapD in reservoirs and glnA in bays, while glmS and eno were predominant for polysaccharide biosynthesis in bays. This research advances our understanding of microbial-EPS-MP interactions in urban water systems, offering critical insights into ecological remediation and risk assessment of MP pollution.
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MicrobialDynamics on Different Microplastics in CoastalUrban Aquatic Ecosystems: The Critical Roles of Extracellular PolymericSubstances
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Researchers investigated microbial community composition and extracellular polymeric substance secretion across plastispheres formed on different microplastic types at two coastal urban water sites, using permutational multivariate analysis to show that microplastic type significantly shaped microbial community structure. The findings reveal that EPS production and microbial colonization patterns vary systematically with polymer chemistry, influencing plastisphere ecology.
Occurrence and Distribution of Plastispheres in Coastal Sediments and Waters along the Maharashtra Coast, India
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Researchers surveyed microplastic contamination in coastal sediments and waters along the Maharashtra coast of India and found widespread presence of microbial communities colonizing plastic surfaces, known as plastispheres. The study identified a diverse range of bacteria, including potentially harmful species, growing on the microplastic particles. The findings suggest that microplastics in coastal environments serve as platforms for microbial growth that could have ecological and public health implications.
Edaphic Gradients Reshape Microbial Microenclaves Assembly within Plastispheres
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Researchers sampled microplastics and surrounding soils at 27 urban wetland sites in China to study how bacteria colonize plastic surfaces, forming communities known as plastispheres. They found that plastispheres selectively recruit soil bacteria but harbor only 52-69% of the bacterial diversity found in adjacent soil. The study reveals that soil nutrient levels and moisture conditions strongly influence how these microplastic-associated microbial communities assemble.
The ecology of the plastisphere: Microbial composition, function, assembly, and network in the freshwater and seawater ecosystems
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Researchers studied the communities of bacteria and fungi that colonize microplastic surfaces in freshwater and seawater, forming what scientists call the plastisphere. These microplastic-associated communities were distinctly different from those in surrounding water, and included a higher proportion of disease-causing organisms and species involved in pollutant degradation. The findings suggest that microplastics create new habitats that can harbor pathogens and alter natural microbial ecosystems in ways that may affect water quality and human health.
Dynamic Alterations of Extracellular Polymeric Substances and Their Associations with Microbial Communities in the Soil Plastisphere
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Scientists studied how bacteria form slimy protective layers on tiny plastic particles in soil and found that different types of bacteria create different chemical mixtures over time. This matters because these bacterial communities on microplastics could affect how harmful the plastic particles become as they move through soil and potentially into our food and water. Understanding how bacteria stick to and change microplastics helps us better predict the health risks these tiny plastic pieces might pose.
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