Capillary interactions drive the self-organization of bacterial colonies

Researchers have discovered that capillary forces, arising from the thin water layers bacteria inhabit, play a significant role in how these microorganisms organize themselves. These forces create an attraction between individual bacterial cells, enabling them to move past each other while still forming cohesive groups. Experiments and modeling revealed that these capillary interactions cause rod-shaped bacteria to arrange into dense, aligned formations, influencing their collective movement and overall shape.

This finding suggests that physical forces like capillary action are fundamental in shaping how microbial communities form and behave in environments with limited water.