This is a color version of a B&W figure (Fig. 1) in our review paper on nutrient fluxes. It shows the reduction in concentration around a nutrient-absorbing, spherical cell in stagnant water (left panel), when the cell is moving left to right (middle panel) and when it is in a simple, irrotational shear field (right panel). For details, see
Karp-Boss, L., E. Boss and P.A. Jumars. 1996. Nutrient fluxes to planktonic osmotrophs in the presence of fluid motion. Oceanogr. Mar. Biol., Ann. Rev. 34: 71-107.