Urbanization impacts the environmental microbial community and its antibiotic phenotypic resistance potential by reshaping the diversity and network complexity.

Urbanization causes microbial network fragmentation but enhances the robustness of antimicrobial resistance (AMR) networks, with potential implications for AMR spread.

• Why it matters: Understanding how urbanization alters microbial communities and AMR potential is crucial for predicting and managing the spread of resistance in human-impacted environments.
• What they did: The study combined metabarcoding and in vitro AMR screening across ecosystems in France, using network analysis and models to assess ecological drivers, network resilience, and AMR connectivity.
• The result: Findings show urbanization weakens overall microbial network cohesion but significantly densifies and stabilizes AMR networks, highlighting the need for integrated surveillance to mitigate resistance dissemination.