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Coalescent theory for seed bank models

Published online by Cambridge University Press:  14 July 2016

Ingemar Kaj*
Affiliation:
Uppsala University
Stephen M. Krone*
Affiliation:
University of Idaho
Martin Lascoux*
Affiliation:
Uppsala University
*
Postal address: Department of Mathematics, Uppsala University, S-751 06 Uppsala, Sweden.
∗∗ Postal address: Department of Mathematics, University of Idaho, Moscow, ID 83844-1103, USA. Email address: krone@uidaho.edu
∗∗∗ Postal address: Department of Conservation Biology and Genetics, EBC, Uppsala University, S-752 36 Uppsala, Sweden.

Abstract

We study the genealogical structure of samples from a population for which any given generation is made up of direct descendants from several previous generations. These occur in nature when there are seed banks or egg banks allowing an individual to leave offspring several generations in the future. We show how this temporal structure in the reproduction mechanism causes a decrease in the coalescence rate. We also investigate the effects of age-dependent neutral mutations. Our main result gives weak convergence of the scaled ancestral process, with the usual diffusion scaling, to a coalescent process which is equivalent to a time-changed version of Kingman's coalescent.

Type
Research Papers
Copyright
Copyright © Applied Probability Trust 2001 

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