Characterizing sediment functional traits and ecological consequences respond to increasing antibiotic pollution

Area of Science:

• Environmental microbiology
• Biogeochemistry
• Ecotoxicology

Background:

• Antibiotic exposure alters microbial community structure.
• Functional consequences and biogeochemical impacts remain poorly understood.
• Accurate projections of nutrient dynamics require this knowledge.

Purpose of the Study:

• Explore microbial taxonomic and functional responses to antibiotic pollution.
• Link these responses to biogeochemical processes.
• Assess microbial adaptation and identify diagnostic biomarkers.

Main Methods:

• Metagenomic analysis of sediment microbial communities.
• Assessing taxonomic and functional structures along an antibiotic gradient.
• Measuring enzyme activities and gene abundances.

Main Results:

• Distinct microbial communities and functional traits observed with increasing antibiotic pollution.
• Functional structures showed higher sensitivity to antibiotic and physicochemical distances.
• Antibiotics inhibited nitrogen cycling but stimulated methane production while inhibiting methane consumption.
• Microbial sulfate uptake potential increased, indicating adaptation.
• Specific genes accurately diagnosed antibiotic concentrations.

Conclusions:

• Antibiotic pollution significantly alters microbial community function and biogeochemical processes.
• Antibiotic pollution can increase methane efflux and decrease nitrous oxide emission.
• Microbial adaptation to antibiotic pollution is evident, with potential for biomarker development.