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Impact of Microplastics on the Gene Abundance of ANME-1 Methane Metabolism
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Researchers tested whether microplastics affect methane-metabolizing archaea in cold seep environments and found that microplastic addition did not significantly change gene abundance related to methane production or oxidation, though environmental factors like habitat type had a much stronger influence on these microbial communities.
Microplastics (MPs), produced in large quantities due to their affordability and durability, have raised concerns about their environmental impact.In 2021, global plastic production reached 390.7 million tons.Cold seeps harbor significant populations of ANME-1 archaea, which are involved in methane production and oxidation.However, the effect of MPs on the gene abundance related to methane metabolism in ANME-1 remains unclear.To address this gap, the present study conducted laboratory cultivation experiments using sediment and seawater samples from the Haima cold seep.The main findings are: (1) The addition of MPs did not significantly affect the gene abundance of the ANME-1 community (p > 0.05).(2) Methane metabolism gene coverage in sediment was higher than in seawater (p < 0.001).(3) Environmental factors significantly impacted the gene abundance of nitrogen and methane metabolisms in seawater compared to sediment.This work provides a better perspective on the impact of MPs on methane production and oxidation in the cold seep.
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Laboratory experiments exposing cold seep seafloor sediments to microplastics for 120 days showed that polyamide and PET microplastics reduced methane oxidation rates to roughly a third of normal and altered the bacterial communities responsible for this process. Cold seep sediments are major global sinks for methane, so microplastic disruption of this microbial activity could have implications for greenhouse gas cycling in deep ocean environments.
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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.
Effects of Different Types of Microplastics on Cold Seep Microbial Diversity and Function
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Researchers simulated deep-sea cold seep conditions to study how different microplastics affect microbial communities. They found that microplastics made the plastisphere microbial networks more fragile than surrounding environments and disrupted nitrogen cycling and methane metabolism, while potentially concentrating pathogenic species.
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This study investigated how the presence of microplastics in marine sediments affects microbial communities and, specifically, the methane cycle, finding that microplastics significantly altered microbial community structure and function. Since marine sediment microbes play a critical role in regulating greenhouse gas emissions, microplastic contamination could have broader climate-relevant effects beyond direct toxicity.
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