Noise induced stabilization in population dynamics
  We investigate a model where strong noise in a sub-population creates a metastable state in an otherwise unstable two-population system. The induced metastable state is vortex-like, and its persistence time grows exponentially with the noise strength. A variety of distinct scaling relations are observed depending on the relative strength of the sub-population noises. 
Matthew Parker, Alex Kamenev, Baruch Meerson
cond-mat.stat-mech q-bio.PE