'The Good, the Bad and the Double-Sword' Effects of Microplastics and Their Organic Additives in Marine Bacteria

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dc.contributor.author Fernández-Juárez, Víctor
dc.contributor.author López-Alforja, Xabier
dc.contributor.author Frank-Comas, Aida
dc.contributor.author Echeveste, Pedro
dc.contributor.author Bennasar-Figueras, Antoni
dc.contributor.author Ramis-Munar, Guillem
dc.contributor.author Gomila, Rosa María
dc.contributor.author Agawin, Nona S. R.
dc.date.accessioned 2021-05-26T06:40:21Z
dc.date.available 2021-05-26T06:40:21Z
dc.identifier.uri http://hdl.handle.net/11201/155551
dc.description.abstract [eng] Little is known about the direct effects of microplastics (MPs) and their organic additives on marine bacteria, considering their role in the nutrient cycles, e.g., N-cycles through the N2-fixation, or in the microbial food web. To fill this gap of knowledge, we exposed marine bacteria, specifically diazotrophs, to pure MPs which differ in physical properties (e.g., density, hydrophobicity and/or size), namely, polyethylene, polypropylene, polyvinyl chloride and polystyrene, and to their most abundant associated organic additives (e.g., fluoranthene, 1,2,5,6,9,10-hexabromocyclododecane and dioctyl-phthalate). Growth, protein overproduction, direct physical interactions between MPs and bacteria, phosphorus acquisition mechanisms and/or N2-fixation rates were evaluated. Cyanobacteria were positively affected by environmental and high concentrations of MPs, as opposed to heterotrophic strains, that were only positively affected with high concentrations of ~120 µm-size MPs (detecting the overproduction of proteins related to plastic degradation and C-transport), and negatively affected by 1 µm-size PS beads. Generally, the organic additives had a deleterious effect in both autotrophic and heterotrophic bacteria and the magnitude of the effect is suggested to be dependent on bacterial size. Our results show species-specific responses of the autotrophic and heterotrophic bacteria tested and the responses (beneficial: the 'good', deleterious: the 'bad' and/or both: the 'double-sword') were dependent on the type and concentration of MPs and additives. This suggests the need to determine the threshold levels of MPs and additives concentrations starting from which significant effects can be observed for key microbial populations in marine systems, and these data are necessary for effective environmental quality control management.
dc.format application/pdf
dc.relation.isformatof https://doi.org/10.3389/fmicb.2020.581118
dc.relation.ispartof Frontiers In Microbiology, 2021, vol. 11, num. 581118
dc.rights , 2021
dc.subject.classification 579 - Microbiologia
dc.subject.other 579 - Microbiology
dc.title 'The Good, the Bad and the Double-Sword' Effects of Microplastics and Their Organic Additives in Marine Bacteria
dc.type info:eu-repo/semantics/article
dc.date.updated 2021-05-26T06:40:22Z
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.identifier.doi https://doi.org/10.3389/fmicb.2020.581118

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