Quantitative genetics of continuous reaction norms: thermal sensitivity of caterpillar growth rates

Evolution; International Journal of Organic Evolution
J G KingsolverJ Gwen Shlichta

Abstract

A continuous reaction norm or performance curve represents a phenotypic trait of an individual or genotype in which the trait value may vary with some continuous environmental variable. We explore patterns of genetic variation in thermal performance curves of short-term caterpillar growth rate in a population of Pieris rapae. We compare multivariate methods, which treat performance at each test temperature as a distinct trait, with function-valued methods that treat a performance curve as a continuous function. Mean growth rate increased with increasing temperatures from 8 to 35 degrees C, was highest at 35 degrees C, and declined at 40 degrees C. There was substantial and significant variation among full-sib families in their thermal performance curves. Estimates of broad-sense genetic variances and covariances showed that genetic variance in growth rate increased more than 30-fold from low (8-11 degrees C) to high (35-40 degrees C) temperatures, even after differences in mean growth rate across temperatures were removed. Growth rate at 35 and 40 degrees C was negatively correlated genetically, suggesting a genetic trade-off in growth rate at these temperatures; this trade-off may represent either a generalist-specialist trade...Continue Reading

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Citations

Aug 3, 2007·Journal of Mathematical Biology·Jay H Beder, Richard Gomulkiewicz
Nov 8, 2012·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Vanessa K H Young, Matthew E Gifford
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Jul 16, 2021·Journal of Evolutionary Biology·Carlos García-Robledo, Christina S Baer

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