On the importance of scale in evolutionary quantitative genetics

Author:

Hansen Thomas F1,Holstad Agnes2ORCID,Houle David3ORCID,Pélabon Christophe2

Affiliation:

1. Department of Biosciences, CEES, University of Oslo, Blindern , Oslo , Norway

2. Department of Biology, Norwegian University of Science and Technology , Trondheim , Norway

3. Department of Biological Science, Florida State University , Tallahassee, FL , United States

Abstract

Abstract The informed use of scales and units in evolutionary quantitative genetics is often neglected, and naïve standardizations can cause misinterpretations of empirical results. A potentially influential example of such neglect can be found in the recent book by Arnold (2023. Evolutionary quantitative genetics. Oxford University Press). There, Arnold championed the use of heritability over mean-scaled genetic variance as a measure of evolutionary potential arguing that mean-scaled genetic variances are correlated with trait means while heritabilities are not. Here, we show that Arnold’s empirical result is an artifact of ignoring the units in which traits are measured. More importantly, Arnold’s argument mistakenly assumes that the goal of mean scaling is to remove the relationship between mean and variance. In our view, the purpose of mean scaling is to put traits with different units on a common scale that makes evolutionary changes, or their potential, readily interpretable and comparable in terms of proportions of the mean.

Funder

U.S. National Science Foundation

Publisher

Oxford University Press (OUP)

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