Microorganisms drive the biogeochemical cycles that link abiotic and biotic processes in the aqueous environment and are found intricately associated with debris in the Plastisphere. Due to their small particle size and wide distribution, microplastics are incorporated into the biogeochemical pathways and food webs of the marine water column and sediment. In our 2020 contribution to L&O Letters, we reviewed the state of knowledge on microbe-plastic interactions and summarized the potential impact of biogeochemical processes on plastic distribution, cycling, transport, and sedimentation. We also explored how microbe-plastic interactions influence the exposure of consumers to microplastics and plastic degradation products. Key methods to study biofilm development, microbial biodegradation, and microplastic detection in the aqueous environment were discussed, and extended with a commentary on future questions and research directions. Here, we will review the key points of our communication Rogers et al., 2020 and highlight research of the subsequent years that have since added to knowledge in this area of plastics research. Finally, we will touch on the current state of our research and new perspectives gained on the interaction of plastics with microbes and minerals in aquatic biogeochemical cycles.

Primary Presenter: Nicole Posth, University of Copenhagen (nrep@ign.ku.dk)

Authors:

Nicole Posth, University of Copenhagen  (nrep@ign.ku.dk)

Kelsey Rogers, University of Copenhagen  ()

Joan Carreres-Calabuig, University of Copenhagen  ()

Elena Gorokhova, Stockholm University  ()