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Marine plastisphere expands the ecological niche and evolutionary dynamics of nrfA-dependent nitrite ammonifying bacteria
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Scientists discovered that microplastics floating in the ocean host thriving communities of bacteria that process nitrogen in ways different from the surrounding seawater, including hundreds of previously unknown bacterial types. This matters because as plastic pollution accumulates in our oceans, it may be quietly reshaping the marine nitrogen cycle, a process essential to ocean ecosystem health and even greenhouse gas levels, adding another layer of environmental concern beyond the plastic itself.
The marine plastisphere affects nitrogen cycling processes, but its role in nrfA-dependent nitrite ammonification, a critical phase of dissimilatory nitrate reduction to ammonium (DNRA) with important implications for nitrogen retention and greenhouse gas dynamics, remains unexplored. In this study, we analyzed 269 plastisphere metagenomes and eight metatranscriptomes from global public datasets. The plastisphere contained elevated nrfA levels compared to seawater, and nrfA transcripts were consistently detected. A total of 285 putative nrfA-dependent nitrite ammonifying bacteria were identified, including 156 novel genera. Most plastisphere MAGs overlapped with other examined marine biofilms, whereas 109 MAGs were uniquely detected in plastisphere samples within the analyzed comparative datasets. Functional studies revealed diverse electron-donor utilization strategies supporting DNRA in plastisphere microorganisms. Evolutionary analyses showed that nrfA genes were distributed across different phyla through horizontal gene transfer, whereas purifying selection limited sequence divergence. These findings highlight a previously underappreciated genetic and transcriptional potential for DNRA in plastic-associated biofilms at the particle scale, with implications for nitrogen retention within plastisphere microhabitats.
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Scientists found that a bacteria strain living naturally on plastic waste in wetlands can keep breaking down harmful nitrogen pollution even when surrounded by microplastics—while a "normal" bacteria strain struggles and produces more nitrous oxide (a greenhouse gas) and pollution byproducts when exposed to the same plastic bits. This matters because it suggests we could use these plastic-tolerant bacteria to help wastewater treatment systems keep working properly despite the growing microplastic pollution problem, potentially protecting water quality that affects human health.
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Scientists found that plastic pollution in the ocean creates a unique surface where a group of microbes called archaea (distant relatives of bacteria) thrive differently than they do in the surrounding water, and this effect gets stronger in more polluted areas. These microbes can influence important chemical cycles in the ocean, like how methane and nitrogen are processed, meaning plastic waste may be quietly reshaping marine ecosystems in ways we're only beginning to understand. While this study doesn't directly address human health, it's a reminder that plastic pollution's effects reach deep into ocean life at the microbial level, potentially aff
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.
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