The effects of predation risk on mating system expression in a freshwater snail

Evolution; International Journal of Organic Evolution
Josh R Auld

Abstract

Environmental effects on mating system expression are central to understanding mating system evolution in nature. Here, I report the results from a quantitative-genetic experiment aimed at understanding the role of predation risk in the expression and evolution of life-history and mating-system traits in a hermaphroditic freshwater snail (Physa acuta). I reared 30 full-sib families in four environments that factorially contrast predation risk and mate availability and measured age/size at first reproduction, growth rate, a morphological defense, and the early survival of outcrossed/selfed eggs that were laid under predator/no-predator conditions. I evaluated the genetic basis of trade-offs among traits and the stability of the G matrix across environments. Mating reduced growth while predation risk increased growth, but the effects of mating were weaker for predator-induced snails and the effects of predation risk were weaker for snails without mates. Predation risk reduced the amount of time that individuals waited before self-fertilizing and reduced inbreeding depression in the offspring. There was a positive among-family relationship between the amount of time that individuals delayed selfing under predation risk and the mag...Continue Reading

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Citations

Jun 20, 2014·Integrative and Comparative Biology·Cris C Ledón-RettigIan Dworkin
Oct 8, 2013·Evolution; International Journal of Organic Evolution·Tim JanickePatrice David
Sep 9, 2015·Evolution; International Journal of Organic Evolution·Josh R Auld, Ryan Houser
Jun 21, 2019·Proceedings of the National Academy of Sciences of the United States of America·Daniel W A NobleTobias Uller

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