Range Expansion

Range Expansion: Bacteria reproduce and compete for new space

"Genetic drift at expanding frontiers ...," O. Hallatschek, P. Hersen, S. Ramanathan, & D.R. Nelson, PNAS 104, 19926 (2007).

The boundaries between domains fluctuate `super-diffusively'

        

Range expansion can also be initiated on a straight edge:

"Genetic demixing and evolution in linear stepping stone models," K.S. Korolev, M. Avlund, O. Hallatschek & D.R. Nelson, Rev. Mod. Phys.82, 1691 (2010).

Scaling is reminiscent of other growth processes:

Next (Coalescence) Outline Range Expansion Extinction & Coalescence Directed Percolation Macroscopic Manifestations Summary