Additive genetic and environmental variation interact to shape the dynamics of seasonal migration in a wild bird population

Acker, Paul; Daunt, Francis ORCID:; Wanless, Sarah ORCID:; Burthe, Sarah J. ORCID:; Newell, Mark A.; Harris, Michael P.; Swann, Robert L.; Gunn, Carrie; Morley, Tim I.; Reid, Jane M.. 2023 Additive genetic and environmental variation interact to shape the dynamics of seasonal migration in a wild bird population. Evolution, 77 (10). 2128-2143.

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Dissecting joint micro-evolutionary and plastic responses to environmental perturbations requires quantifying interacting components of genetic and environmental variation underlying expression of key traits. This ambition is particularly challenging for phenotypically discrete traits where multiscale decompositions are required to reveal nonlinear transformations of underlying genetic and environmental variation into phenotypic variation, and when effects must be estimated from incomplete field observations. We devised a joint multistate capture–recapture and quantitative genetic animal model, and fitted this model to full-annual-cycle resighting data from partially-migratory European shags (⁠Gulosus aristotelis⁠) to estimate key components of genetic, environmental and phenotypic variance in the ecologically critical discrete trait of seasonal migration versus residence. We demonstrate non-negligible additive genetic variance in latent liability for migration, resulting in detectable micro-evolutionary responses following two episodes of strong survival selection. Further, liability-scale additive genetic effects interacted with substantial permanent individual and temporary environmental effects to generate complex nonadditive effects on expressed phenotypes, causing substantial intrinsic gene-by-environment interaction variance on the phenotypic scale. Our analyses therefore reveal how temporal dynamics of partial seasonal migration arise from combinations of instantaneous micro-evolution and within-individual phenotypic consistency, and highlight how intrinsic phenotypic plasticity could expose genetic variation underlying discrete traits to complex forms of selection.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Biodiversity (Science Area 2017-)
UKCEH Fellows
ISSN: 0014-3820
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: alternative tactics, capture-recapture animal model, cryptic genetic variation, gene by environment interaction, partial migration, quantitative genetic threshold trait
NORA Subject Terms: Ecology and Environment
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Date made live: 03 Nov 2023 17:40 +0 (UTC)

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