Generalized Lotka-Volterra Equations with Random, Nonreciprocal Interactions: The Typical Number of Equilibria
Valentina Ros, Félix de Roy, Giulio Biroli, Guy Bunin, Ari M. Turner
Abstract
We compute the typical number of equilibria of the generalized Lotka-Volterra equations describing species-rich ecosystems with random, nonreciprocal interactions using the replicated Kac-Rice method. We characterize the multiple-equilibria phase by determining the average abundance and similarity between equilibria as a function of their diversity (i.e., of the number of coexisting species) and of the variability of the interactions. We show that linearly unstable equilibria are dominant, and that the typical number of equilibria differs with respect to the average number.
Topics & Concepts
Statistical physicsSimilarity (geometry)Function (biology)MathematicsApplied mathematicsAbundance (ecology)PhysicsComputer scienceEcologyBiologyImage (mathematics)Evolutionary biologyArtificial intelligencePlant and animal studiesEvolution and Genetic DynamicsEvolutionary Game Theory and Cooperation