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Enrichment of potential polyvinyl chloride and polycarbonate microplastic-degrading bacteria and their distribution characteristics in deep-sea cold seep
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Scientists discovered bacteria living in deep-sea "cold seep" environments (areas where gas and fluids leak from the ocean floor) that can actually break down PVC and polycarbonate plastics—two common types of microplastics found in packaging, pipes, and consumer goods. This matters because microplastics have been found throughout our food chain and even in human bodies, so identifying natural microbes that degrade these pollutants could eventually lead to new tools for cleaning up plastic waste before it accumulates further in the environment we depend on. That said, this is early-stage research showing these bacteria *can* break down plastic in control
Microbial degradation represents a promising remediation strategy for polyvinyl chloride (PVC) and polycarbonate (PC) microplastics, which have been widely detected in the Haima cold seeps. However, the diversities and distribution of PVC- and PC-degrading bacteria in cold seep environments remain poorly understood. Therefore, this study combined 1-year in situ incubation and 189-day indoor enrichment experiments to characterize the diversity of plastic-degrading bacteria in the Haima cold seeps. The results showed that the enriched communities could grow using PVC or PC films as the sole carbon source, and the plastic surfaces exhibited clear signs of biodegradation. Dietzia, Pseudarthrobacter, and Saccharopolyspora dominated the bacterial communities of both PVC and PC groups during enrichment. A total of 39 potential PVC-degrading ASVs and 36 potential PC-degrading ASVs were identified based on changes in abundance. Among these ASVs, Dietzia and Bacillus appeared to play crucial roles in degrading both plastics. Additionally, the identified degraders were widely distributed in cold seep environments, with a higher abundance in seawater than in sediments. Correlation analysis suggested that PC plastic-degrading bacteria preferred the high-nutrient sediment environment over that favored by PVC degraders. This study revealed the diversity and distribution characteristics of plastic-degrading bacteria in cold seep environments.
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Scientists discovered ocean bacteria that can break down common plastic types found in marine pollution, with some bacteria destroying up to 17% of the plastic in lab tests. These naturally occurring bacteria could potentially be used to help clean up the tiny plastic particles that contaminate our oceans and eventually enter our food chain through seafood. While still in early research stages, this finding offers hope for a biological solution to reduce the microplastics that may pose health risks when we consume contaminated fish and shellfish.
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Effects of microplastics on cold seep sediment prokaryotic communities
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Researchers studied how polyethylene, polystyrene, and polypropylene microplastics affect microbial communities in cold seep sediments over a 120-day incubation period. The study found that microplastics significantly altered bacterial community structure in a type- and concentration-dependent manner, with some bacteria associated with plastic degradation increasing, while archaeal communities were less affected.
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