Properties of free-living and particle-attached potentially pathogenic bacterial communities in a hypereutrophic urban river network.

Potentially pathogenic bacterial communities in a hypereutrophic urban river show higher richness, abundance, and stability in particle-attached fractions than free-living ones, especially during winter.

• Why it matters: Understanding the structure and seasonal dynamics of pathogenic bacteria in urban rivers is crucial for public health risk assessment and environmental management, yet detailed community patterns remain unclear.
• What they did: A two-year study analyzed bacterial communities across four land-use types, identifying three key pathogenic species and examining factors like community composition, stability, and environmental influences, including water temperature and suspended particles.
• The result: Findings reveal that particle-attached bacteria are more diverse and stable, with community composition influenced by suspended particles and water temperature, especially in agricultural areas, informing strategies for river health and safety.