Can varying inbreeding depression select for intermediary selfing rates?

The American Naturalist
P-O Cheptou, A Mathias

Abstract

We study the evolution of the self-fertilization of an annual hermaphroditic plant under varying inbreeding depression. While classical population genetic models treat inbreeding depression as a constant parameter, recent empirical research has shown that changing environmental conditions can make inbreeding depression vary. Here, we create a simple phenotypic model, assuming variable inbreeding depression. We investigate how different types of variability (spatial, temporal, and spatiotemporal variability) affect the evolution of selfing rates in three models. Two main results, which differ from the classical predictions, emerge from this study. First, we find that fluctuating environments, which influence the magnitude of inbreeding depression, are able to select for evolutionarily stable intermediary selfing rates. Second, we show that spatiotemporal variation of inbreeding depression can lead to the development and the maintenance of polymorphic selfing rates within a population.

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Citations

Nov 26, 2010·Journal of Mathematical Biology·Akira Sasaki, Ulf Dieckmann
Jul 3, 2002·Evolution; International Journal of Organic Evolution·Pierre-Olivier Cheptou, Daniel J Schoen
Sep 15, 2007·The American Naturalist·Janette A SteetsTia-Lynn Ashman
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Sep 3, 2005·Evolution; International Journal of Organic Evolution·Martin T Morgan, William G Wilson
Feb 9, 2005·Evolution; International Journal of Organic Evolution·Pierre-Olivier Cheptou
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