Swarming motility

Swarming motility was first reported by Jorgen Henrichsen[2] and has been mostly studied in genus Serratia,[3][4] Salmonella,[5] Aeromonas,[6] Bacillus,[7] Yersinia,[8] Pseudomonas,[9][10][11][12][13] Proteus,[14] Vibrio[15][16] and Escherichia.

[17][18] This multicellular behavior has been mostly observed in controlled laboratory conditions and relies on two critical elements: 1) the nutrient composition and 2) viscosity of culture medium (i.e. % agar).

[5] One particular feature of this type of motility is the formation of dendritic fractal-like patterns formed by migrating swarms moving away from an initial location.

Cells localized at migration front are typically hyperelongated, hyperflagellated and grouped in multicellular raft structures.

However, it has been observed that active swarming bacteria of Salmonella typhimurium shows an elevated resistance to certain antibiotics compared to undifferentiated cells.

Pseudomonas aeruginosa
exhibiting swarming motility
Bacteria of the species Bacillus subtilis were inoculated at the center of a dish with gelose containing nutrients. The bacteria start mass-migrating outwards about twelve hours after inoculation, forming dendrites which reach the border of the dish (diameter 90mm) within a few hours. Two days after inoculation the number of bacteria has increased so much that they diffuse light significantly and appear white. This picture was taken against a lightsource to make the dendrites (white branched structures) clearly stand out.