One-dimensional stepping stone models, sardine genetics and Brownian local time

Journal Article (Journal Article)

Consider a one-dimensional stepping stone model with colonies of size M and per-generation migration probability v, or a voter model on ℤ in which interactions occur over a distance of order K. Sample one individual at the origin and one at L. We show that if Mv/L and L/K2 converge to positive finite limits, then the genealogy of the sample converges to a pair of Brownian motions that coalesce after the local time of their difference exceeds an independent exponentially distributed random variable. The computation of the distribution of the coalescence time leads to a one-dimensional parabolic differential equation with an interesting boundary condition at 0. © Institute of Mathematical Statistics, 2008.

Full Text

Duke Authors

Cited Authors

  • Durrett, R; Restrepo, M

Published Date

  • February 1, 2008

Published In

Volume / Issue

  • 18 / 1

Start / End Page

  • 334 - 358

Electronic International Standard Serial Number (EISSN)

  • 1050-5164

International Standard Serial Number (ISSN)

  • 1050-5164

Digital Object Identifier (DOI)

  • 10.1214/07-AAP451

Citation Source

  • Scopus