Figure 2

The collisions of colonization waves. (A) Occupancy measure (area fraction) calculated per patch for strains JEK1037 (red) and JEK1036 (green) showing the collision between two α waves (at t = 6 h, patch 54). Note how both waves branch: a part of the wave is reflected, a part forms a stationary population, and a part continuous (for a short distance) in the same direction. (B) Kymograph of fluorescence intensity for the collision shown in A. (C) Enlarged view of B, centered at the point of collision. Note how the red and green populations remain largely segregated in space, even though individual cells do mix with the other population. (D) Kymograph of fluorescence intensity of a collision in a different habitat in the same device (with separate inlets; type-2) as the habitat shown in A- C. Note the similarity between B and D. (E) Enlarged view of D, centered at the point of collision.