Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection

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O'Sullivan , R J , Aykanat , T , Johnston , S E , Kane , A , Poole , R , Rogan , G , Prodöhl , P A , Primmer , C R , McGinnity , P & Reed , T E 2019 , ' Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection ' , Ecology and Evolution , vol. 9 , no. 12 , pp. 7096-7111 . https://doi.org/10.1002/ece3.5274

Title: Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection
Author: O'Sullivan, Ronan James; Aykanat, Tutku; Johnston, Susan E.; Kane, Adam; Poole, Russell; Rogan, Ger; Prodöhl, Paulo A.; Primmer, Craig R.; McGinnity, Philip; Reed, Thomas Eric
Contributor: University of Helsinki, External Funding
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
Date: 2019-06
Language: eng
Number of pages: 16
Belongs to series: Ecology and Evolution
ISSN: 2045-7758
URI: http://hdl.handle.net/10138/305172
Abstract: Comparing observed versus theoretically expected evolutionary responses is important for our understanding of the evolutionary process, and for assessing how species may cope with anthropogenic change. Here, we document directional selection for larger female size in Atlantic salmon, using pedigree-derived estimates of lifetime reproductive success as a fitness measure. We show the trait is heritable and, thus, capable of responding to selection. The Breeder's Equation, which predicts microevolution as the product of phenotypic selection and heritability, predicted evolution of larger size. This was at odds, however, with the observed lack of either phenotypic or genetic temporal trends in body size, a so-called "paradox of stasis." To investigate this paradox, we estimated the additive genetic covariance between trait and fitness, which provides a prediction of evolutionary change according to Robertson's secondary theorem of selection (STS) that is unbiased by missing variables. The STS prediction was consistent with the observed stasis. Decomposition of phenotypic selection gradients into genetic and environmental components revealed a potential upward bias, implying unmeasured factors that covary with trait and fitness. These results showcase the power of pedigreed, wild population studies-which have largely been limited to birds and mammals-to study evolutionary processes on contemporary timescales.
Subject: Atlantic salmon
Breeder's equation
pedigree
phenotypic selection
secondary theorem of selection
SALMON SALMO-SALAR
INTENSE NATURAL-SELECTION
FITNESS-RELATED TRAITS
ATLANTIC SALMON
BODY-SIZE
PHENOTYPIC SELECTION
SOCKEYE-SALMON
SEXUAL SELECTION
ADAPTIVE EVOLUTION
NORTH-ATLANTIC
1181 Ecology, evolutionary biology
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