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Metagenomics reveals the influence of small microplastics on microbial communities in coastal sediments
Summary
Researchers used high-throughput metagenomic sequencing and micro-Raman spectrometry to study how small microplastics (under 100 um) influence microbial communities in coastal sediments of Hangzhou Bay, China. Results revealed distinct microbial community shifts associated with small microplastic presence, an effect often overlooked due to measurement challenges at small particle sizes.
The ecological impact of microplastics (MPs) in coastal environments has been widely studied. However, the influence of small microplastics in the actual environment is often overlooked due to measurement challenges. In this study, Hangzhou Bay (HZB), China, was selected as our study area. High-throughput metagenomic sequencing and micro-Raman spectrometry were employed to analyze the microbial communities and microplastics of coastal sediment samples, respectively. We aimed to explore the ecological impact of MPs with small sizes (≤ 100 μm) in real coastal sediment environments. Our results revealed that as microplastic size decreased, the environmental behavior of MPs underwent alterations. In the coastal sediments, no significant correlations were observed between the detected MPs and the whole microbial communities, but small MPs posed potential hazards to eukaryotic communities. Moreover, these small MPs were more prone to microbial degradation and significantly affected carbon metabolism in the habitat. This study is the first to reveal the comprehensive impact of small MPs on microbial communities in a real coastal sediment environment.
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