Quantitative genetics of migration-related traits in rainbow and steelhead trout

G3 : Genes - Genomes - Genetics
Benjamin C HechtKrista M Nichols

Abstract

Rainbow trout (Oncorhynchus mykiss) exhibit remarkable life history diversity throughout their native range, and among the most evident is variation in migratory propensity. Although some populations and ecotypes will remain resident in freshwater habitats throughout their life history, others have the ability to undertake tremendous marine migrations. Those that migrate undergo a suite of behavioral, morphological, and physiological adaptations in a process called smoltification. We describe a quantitative genetic analysis of 22 growth, size, and morphological traits in addition to overall life history classification (resident or migrant) over the temporal process of smoltification in a large multi-generation experimental pedigree (n = 16,139) of migratory and resident rainbow trout derived from a wild population, which naturally segregates for migratory propensity. We identify significant additive genetic variance and covariance among the suite of traits that make up a component of the migratory syndrome in this species. Additionally, we identify high heritability estimates for the life history classifications and observe a strong negative genetic correlation between the migratory and resident life history trajectories. Given...Continue Reading

References

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Citations

May 12, 2015·Molecular Ecology·Melinda R BaerwaldKrista M Nichols
Jul 23, 2020·Proceedings. Biological Sciences·Paul V DebesCraig R Primmer
May 19, 2017·Evolutionary Applications·Travis M ApgarEric P Palkovacs
Jul 28, 2020·Trends in Genetics : TIG·Christine MerlinAldrin B Lugena

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Software Mentioned

R package MASS
R
R package MCMCglmm
MCMCglmm
R Core Team
tpsDig2
ASReml
CentroidSize

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