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We investigate the phenomenology emerging from a 2-species dynamics under thescenario of a quasi-neutral competition within a metapopulation framework. Weemploy stochastic and deterministic approaches, namely spatially-constrainedindividual-based Monte Carlo simulations and coupled mean-field ODEs. Ourresults show the multifold interplay between competition, birth-death dynamicsand spatial constraints induces a nonmonotonic relation between the ecologicalmajority-minority switching and the diffusion between patches. This means thatdiffusion can set off birth-death ratios and enhance the preservation of aspecies.

Diffusion plays an unusual role in ecological quasi-neutral competition in metapopulations