
We investigate extinction dynamics in the paradigmatic model of two competing species A and B that reproduce (A-->2A, B-->2B), self-regulate by annihilation (2A-->0, 2B-->0), and compete (A+B-->A, A+B-->B). For a finite system that is in the well-mixed limit, a quasi-stationary state arises which describes coexistence of the two species. Because of discrete noise, both species eventually become extinct in time that is exponentially long in the quasi-stationary population size. For a sizable range of asymmetries in the growth and competition rates, the paradoxical situation arises in which the numerically disadvantaged species according to the deterministic rate equations survives much longer.
5 pages, 2-column revtex4-1 format; current revision has stylistic changes in response to referees, for publication in PRE Rapid Communications
Competitive Behavior, Models, Statistical, Statistical Mechanics (cond-mat.stat-mech), Population Dynamics, Populations and Evolution (q-bio.PE), FOS: Physical sciences, Survival Analysis, Survival Rate, Game Theory, FOS: Biological sciences, Computer Simulation, Quantitative Biology - Populations and Evolution, Condensed Matter - Statistical Mechanics
Competitive Behavior, Models, Statistical, Statistical Mechanics (cond-mat.stat-mech), Population Dynamics, Populations and Evolution (q-bio.PE), FOS: Physical sciences, Survival Analysis, Survival Rate, Game Theory, FOS: Biological sciences, Computer Simulation, Quantitative Biology - Populations and Evolution, Condensed Matter - Statistical Mechanics
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