Noise and Correlations in a Spatial Population Model with Cyclic Competition

Tobias Reichenbach, Mauro Mobilia, Erwin Frey
2007 Physical Review Letters  
Noise and spatial degrees of freedom characterize most ecosystems. Some aspects of their influence on the coevolution of populations with cyclic interspecies competition have been demonstrated in recent experiments [e.g. B. Kerr et al., Nature 418, 171 (2002)]. To reach a better theoretical understanding of these phenomena, we consider a paradigmatic spatial model where three species exhibit cyclic dominance. Using an individual-based description, as well as stochastic partial differential and
more » ... eterministic reaction-diffusion equations, we account for stochastic fluctuations and spatial diffusion at different levels, and show how fascinating patterns of entangled spirals emerge. We rationalize our analysis by computing the spatio-temporal correlation functions and provide analytical expressions for the front velocity and the wavelength of the propagating spiral waves.
doi:10.1103/physrevlett.99.238105 pmid:18233418 fatcat:oolyxhhikrdbvnubha367ksxse