Fig. 4.
E. coli in a flat landscape of habitat patches. (A) Photograph montage (see text) capturing the spatial dynamics of the metapopulation during the phase of spatial expansion of its range of occupancy (spatial-log-phase) in a flat, fully open (λi = λmax) landscape. White pixels (x, y) correspond to GFP fluorescence. δt = 10 min. (B) Global (dashed blue) vs. local (solid black) dynamics. Logistic growth (Eq. 3) fitted to the global average is also shown (dotted red; τT ∼ 250 min). Vertical (dashed gray) lines in B mark the spatial-log-phase shown in A.