Genetic variation underlying the expression of a polyphenism

Journal of Evolutionary Biology
Bruno A BuzattoJoseph L Tomkins

Abstract

Polyphenic traits are widespread and represent a conditional strategy sensitive to environmental cues. The environmentally cued threshold (ET) model considers the switchpoint between alternative phenotypes as a polygenic quantitative trait with normally distributed variation. However, the genetic variation for switchpoints has rarely been explored empirically. Here, we used inbred lines to investigate the genetic variation for the switchpoint in the mite Rhizoglyphus echinopus, in which males are either fighters or scramblers. The conditionality of male dimorphism varied among inbred lines, indicating that there was genetic variation for switchpoints in the base population, as predicted by the ET model. Our results also suggest a mixture between canalized and conditional strategists in R. echinopus. We propose that major genes that canalize morph expression and affect the extent to which a trait can be conditionally expressed could be a feature of the genetic architecture of threshold traits in other taxa.

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Citations

Sep 20, 2012·Integrative and Comparative Biology·Ryan L EarleyElizabeth A Lee
Apr 2, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Bruno A BuzattoJoseph L Tomkins
May 14, 2014·Experimental & Applied Acarology·Deborah M Leigh, Isabel M Smallegange
Jul 2, 2014·Behavioural Processes·Bruno A Buzatto, Glauco Machado
Feb 13, 2015·The American Naturalist·Olof Leimar, John M McNamara
Jun 20, 2013·The American Naturalist·Luis-Miguel Chevin, Russell Lande
Dec 18, 2015·Proceedings. Biological Sciences·Bruno A BuzattoJoseph L Tomkins
Oct 3, 2012·Evolution; International Journal of Organic Evolution·Bruno A BuzattoJoseph L Tomkins
Mar 20, 2014·Evolution; International Journal of Organic Evolution·Agata Plesnar BielakJacek Radwan
Nov 7, 2015·Scientific Reports·Christina J PaintingGregory I Holwell
May 26, 2018·Proceedings. Biological Sciences·Bruno A BuzattoJoseph L Tomkins
Aug 5, 2021·Proceedings. Biological Sciences·Samuel J LymberyDavid J Hosken

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