Survival of the scarcer

Alan Gabel*, Baruch Meerson, S. Redner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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 quasistationary 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 quasistationary 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.

Original languageAmerican English
Article number010101
JournalPhysical Review E
Issue number1
StatePublished - 3 Jan 2013


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