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Title: Assessing the Ecotoxicity of Eight Widely Used Antibiotics on River Microbial Communities
Authors: Pino Otín, Rosa ORCID SCOPUSID
Lorca, Guillermo
Langa Morales, Elisa SCOPUSID
Roig, Francisco J. ORCID SCOPUSID
Terrado, Eva María SCOPUSID
Ballestero Fernández, Diego
Keywords: Ecotoxicity; River microbial community; Antibiotics; Biolog EcoPlates™; Community-level; Physiological profiling
Issue Date: 30-Nov-2023
Publisher: MDPI
Citation: Pino-Otín, M.R.; Lorca, G.; Langa, E.; Roig, F.; Terrado, E.M.; Ballestero, D. Assessing the Ecotoxicity of Eight Widely Used Antibiotics on River Microbial Communities. Int. J. Mol. Sci. 2023, 24, 16960. ijms242316960
Abstract: Global prevalence of antibiotic residues (ABX) in rivers requires ecotoxicological impact assessment. River microbial communities serve as effective bioindicators for this purpose. We quantified the effects of eight commonly used ABXs on a freshwater river microbial community using Biolog EcoPlates™, enabling the assessment of growth and physiological profile changes. Microbial community characterization involved 16S rRNA gene sequencing. The river community structure was representative of aquatic ecosystems, with the prevalence of Cyanobacteria, Proteobacteria, Actinobacteria, and Bacteroidetes. Our findings reveal that all ABXs at 100 g/mL reduced microbial community growth and metabolic capacity, particularly for polymers, carbohydrates, carboxylic, and ketonic acids. Chloramphenicol, erythromycin, and gentamicin exhibited the highest toxicity, with chloramphenicol notably impairing the metabolism of all studied metabolite groups. At lower concentrations (1 g/mL), some ABXs slightly enhanced growth and the capacity to metabolize substrates, such as carbohydrates, carboxylic, and ketonic acids, and amines, except for amoxicillin, which decreased the metabolic capacity across all metabolites. We explored potential correlations between physicochemical parameters and drug mechanisms to understand drug bioavailability. Acute toxicity effects at the river-detected low concentrations (ng/L) are unlikely. However, they may disrupt microbial communities in aquatic ecosystems. The utilization of a wide array of genetically characterized microbial communities, as opposed to a single species, enables a better understanding of the impact of ABXs on complex river ecosystems.
ISSN: 1422-0067
Appears in Collections:Artículos de revistas

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