Abstract

AbstractMicroorganisms drive the biogeochemical cycles that link abiotic and biotic processes in the aqueous environment and are intricately associated with plastic debris. The presence of microplastics in water and sediment introduces new concerns as small particle size allows for increased pathways of microplastics in the food web and element cycles. In this review, we present the current state of knowledge on microbe‐plastic interactions and summarize the potential impact of biogeochemical processes on plastic distribution, cycling, transport, and sedimentation. We explore how microbe‐plastic interactions influence the exposure of consumers to microplastics and plastic degradation products. Key methods used to elucidate biofilm development, microbial biodegradation, and microplastic detection in the aqueous environment are discussed. Finally, we comment on potential future questions and research directions needed to further define the role of microorganisms in the environmental fate of microplastics.

Highlights

  • Microorganisms drive the biogeochemical cycles that link abiotic and biotic processes in the aqueous environment and are intricately associated with plastic debris

  • We present the current state of knowledge on microbe-plastic interactions and summarize the potential impact of biogeochemical processes on plastic distribution, cycling, transport, and sedimentation

  • We explore how microbe-plastic interactions influence the exposure of consumers to microplastics and plastic degradation products

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Summary

Scientific Significance Statement

Due to their small particle size and wide distribution, microplastics can be incorporated into the biogeochemical pathways and food webs of the marine water column and sediment. Our understanding of microplastics in these pathways is still nascent, but of fundamental importance to estimate plastic’s environmental fate and potential remediation. A massive research effort across fields in the last years has brought our understanding further, but there is a strong need to streamline and converge findings. We discuss evidence from controlled laboratory experiments and field studies on microbe-plastic interactions and consider the biogeochemical relevance. Particular focus is on new methods and analytical approaches to understand the two-way interactions between microorganisms and microplastics and the implications for the environmental fate of marine plastic litter

Colwelliae Pseudoalteromonase
Anaerolinaceaea Leptolyngbyaceaeb
Anaerolineal Leptolyngbyah
Dinoflagellates Coccolithophores Ochraphyta Other Eukaryotes
Coastal Australiak
Bacteria Flavobacteriaceaeb
Other eukaryotes
Plastic in coastal Japani
Evidence of plastic biodegradation
Findings
Future directions
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