Scientists recently utilized 16S gene sequencing to profile the bacterial communities attached to microplastic samples from intertidal locations around the Yangtze estuary in China. The structure and composition of plastisphere communities varied significantly among the locations. They found the taxonomic composition on microplastic samples was related to their sedimentary and aquatic origins. Correlation network analysis was used to identify keystone bacterial genera (e.g. Rhodobacterales, Sphingomonadales and Rhizobiales), which represented important microbial associations within the plastisphere community. Other species (i.e. potential pathogens) were considered as hitchhikers in the plastic attached microbial communities. Metabolic pathway analysis suggested adaptations of these bacterial assemblages to the plastic surface-colonization lifestyle. These adaptations included reduced “cell motility” and greater “xenobiotics biodegradation and metabolism.”
These findings illustrate the diverse microbial assemblages that occur on microplastic and increase our understanding of plastisphere ecology.
Abundance of KEGG pathways present at the surface of each plastic particle. Positive values and black colors suggest the enrichments, (PE: polyethylene, PP: polypropylene, PS: polystyrene).