The first three authors contributed equally to this work. Other authors are listed alphabetically.
The genetic consequences of fluctuating inbreeding depression and the evolution of plant selfing rates
Version of Record online: 18 FEB 2009
© 2009 The Authors. Journal Compilation © 2009 European Society For Evolutionary Biology
Journal of Evolutionary Biology
Volume 22, Issue 4, pages 708–717, April 2009
How to Cite
PORCHER, E., KELLY, J. K., CHEPTOU, P.-O., ECKERT, C. G., JOHNSTON, M. O. and KALISZ, S. (2009), The genetic consequences of fluctuating inbreeding depression and the evolution of plant selfing rates. Journal of Evolutionary Biology, 22: 708–717. doi: 10.1111/j.1420-9101.2009.01705.x
- Issue online: 13 MAR 2009
- Version of Record online: 18 FEB 2009
- Received 30 September 2008; revised 7 January 2009; accepted 8 January 2009
- environmental variation;
- genetic load;
- mixed mating;
The magnitude of inbreeding depression, a central parameter in the evolution of plant mating systems, can vary depending on environmental conditions. However, the underlying genetic mechanisms causing environmental fluctuations in inbreeding depression, and the consequences of this variation for the evolution of self-fertilization, have been little studied. Here, we consider temporal fluctuations of the selection coefficient in an explicit genetic model of inbreeding depression. We show that substantial variance in inbreeding depression can be generated at equilibrium by fluctuating selection, although the simulated variance tends to be lower than has been measured in experimental studies. Our simulations also reveal that purging of deleterious mutations does not depend on the variance in their selection coefficient. Finally, an evolutionary analysis shows that, in contrast to previous theoretical approaches, intermediate selfing rates are never evolutionarily stable when the variation in inbreeding depression is due to fluctuations in the selection coefficient on deleterious mutations.