The genetic architecture of maternal effects across ontogeny in the red deer
Date
2020
Authors
Gauzere, Julie
Pemberton, Josephine M
Morris, Sean
Morris, Alison
Kruuk, Loeske
Walling, Craig A.
Journal Title
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Volume Title
Publisher
Wiley
Abstract
Maternal effects, either environmental or genetic in origin, are an underappreciated source of phenotypic variance in natural populations. Maternal genetic effects have the potential to constrain or enhance the evolution of offspring traits depending on their magnitude and their genetic correlation with direct genetic effects. We estimated the maternal effect variance and its genetic component for 12 traits expressed over the life history in a pedigreed population of wild red deer (morphology, survival/longevity, breeding success). We only found support for maternal genetic effect variance in the two neonatal morphological traits: birth weight (urn:x-wiley:00143820:media:evo14000:evo14000-math-0001 = 0.31) and birth leg length (urn:x-wiley:00143820:media:evo14000:evo14000-math-0002 = 0.17). For these two traits, the genetic correlation between maternal and direct additive effects was not significantly different from zero, indicating no constraint to evolution from genetic architecture. In contrast, variance in maternal genetic effects enhanced the additive genetic variance available to respond to natural selection. Maternal effect variance was negligible for late‐life traits. We found no evidence for sex differences in either the direct or maternal genetic architecture of offspring traits. Our results suggest that maternal genetic effect variance declines over the lifetime, but also that this additional heritable genetic variation may facilitate evolutionary responses of early‐life traits.
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Keywords
Cervus elaphus, cross-sex correlation, genetic constraint, life-history traits, maternal genetic effects, total heritability
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Source
Evolution
Type
Journal article
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Access Statement
Open Access
License Rights
Creative Commons Attribution License
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