Carbon substrate type shapes spatial self-organization in a multi-species biofilm community.

Carbon substrate type determines spatial self-organization in a four-species synthetic biofilm, with polymer-rich substrates promoting structured communities and diffusible sugars leading to intermixed arrangements.

• Why it matters: Understanding how environmental factors influence biofilm architecture is crucial for controlling microbial communities in natural and engineered settings, yet this aspect remains underexplored compared to species composition and interactions.
• What they did: The study used chemically defined, 3D-printed hydrogel substrates with varying carbon sources to examine their effects on biofilm formation and organization, combining microscopy, bioinformatics, and metabolic modeling.
• The result: Findings reveal that carbon substrate type significantly shapes biofilm structure and species localization, emphasizing the importance of environmental context in biofilm development and potential manipulation strategies.