### Abstract

In the paper we present a phenomenon occurring in population processes that start near 0 and have large carrying capacity. By the classical result of Kurtz (1970), such processes, normalized by the carrying capacity, converge on finite intervals to the solutions of ordinary differential equations, also known as the fluid limit. When the initial population is small relative to the carrying capacity, this limit is trivial. Here we show that, viewed at suitably chosen times increasing to ∞, the process converges to the fluid limit, governed by the same dynamics, but with a random initial condition. This random initial condition is related to the martingale limit of an associated linear birth-and-death process.

Original language | English |
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Pages (from-to) | 1193-1205 |

Number of pages | 13 |

Journal | Journal of Applied Probability |

Volume | 53 |

Issue number | 4 |

DOIs | |

Publication status | Published - 1 Dec 2016 |

### Keywords

- Birth-death process
- fluid approximation
- population dynamics with carrying capacity

### Cite this

*Journal of Applied Probability*,

*53*(4), 1193-1205. https://doi.org/10.1017/jpr.2016.74