Reduced mate availability leads to evolution of self-fertilization and purging of inbreeding depression in a hermaphrodite

Evolution; International Journal of Organic Evolution
Elsa NoëlPatrice David

Abstract

Basic models of mating-system evolution predict that hermaphroditic organisms should mostly either cross-fertilize, or self-fertilize, due to self-reinforcing coevolution of inbreeding depression and outcrossing rates. However transitions between mating systems occur. A plausible scenario for such transitions assumes that a decrease in pollinator or mate availability temporarily constrains outcrossing populations to self-fertilize as a reproductive assurance strategy. This should trigger a purge of inbreeding depression, which in turn encourages individuals to self-fertilize more often and finally to reduce male allocation. We tested the predictions of this scenario using the freshwater snail Physa acuta, a self-compatible hermaphrodite that preferentially outcrosses and exhibits high inbreeding depression in natural populations. From an outbred population, we built two types of experimental evolution lines, controls (outcrossing every generation) and constrained lines (in which mates were often unavailable, forcing individuals to self-fertilize). After ca. 20 generations, individuals from constrained lines initiated self-fertilization earlier in life and had purged most of their inbreeding depression compared to controls. Howe...Continue Reading

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Citations

Aug 23, 2016·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Sofia Consuegra, Carlos M Rodríguez López
Aug 9, 2016·Evolution; International Journal of Organic Evolution·Nausicaa PoulletChristian Braendle
Mar 23, 2017·Evolution; International Journal of Organic Evolution·Aurora García-Dorado
Nov 8, 2017·Ecology Letters·Geerat J Vermeij, Richard K Grosberg
Aug 16, 2018·Evolution; International Journal of Organic Evolution·Nicolás BonelPatrice David
Dec 17, 2018·Journal of Plant Research·Matthew R Jahnke, Julie R Etterson
Mar 14, 2018·Ecology and Evolution·Robert T Dillon
Dec 7, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Pierre-Olivier CheptouHans Jacquemyn

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