Environmental vs. demographic variability in two-species predator-prey models
arXiv:1206.0973 · doi:10.1103/PhysRevLett.110.048105
Abstract
We investigate the competing effects and relative importance of intrinsic demographic and environmental variability on the evolutionary dynamics of a stochastic two-species Lotka-Volterra model by means of Monte Carlo simulations on a two-dimensional lattice. Individuals are assigned inheritable predation efficiencies; quenched randomness in the spatially varying reaction rates serves as environmental noise. We find that environmental variability enhances the population densities of both predators and prey while demographic variability leads to essentially neutral optimization.
5 pages, 4 figures included; to appear in Phys. Rev. Lett. (2013)
References in corpus (4)
- Fluctuations and Correlations in Lattice Models for Predator-Prey Interaction
- Stochastic differential equations for evolutionary dynamics with demographic noise and mutations
- Influence of local carrying capacity restrictions on stochastic predator-prey models
- Spatial variability enhances species fitness in stochastic predator-prey interactions