Diffusivity of the bacterial cells toward the tracked algal cells versus distance of the bacteria from the algal cells for a: P. haloplanktis (y=65.6×^1.55, R²=0.77, n=569) and b: S. putrefaciens (y=109.6×^1.16, R²=0.69, n=156). Note, n is the number of runs recorded and points with the same symbols representing all of the runs of an individual bacterium. This shows that the individual bacteria were altering their Diffusivity during their tracking (diffusivity was calculated by multiplying the speed and distance of a bacterium from a tracked alga).