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Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection
- Source :
- Ecology and Evolution, Vol 9, Iss 12, Pp 7096-7111 (2019), Ecology and Evolution, 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, O’Sullivan, R J, Aykanat, T, Johnston, S E, Kane, A, Poole, R, Rogan, G, Prodohl, P, Primmer, C R, McGinnity, P & Reed, T 2019, ' Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection ', Evolutionary Applications, pp. 7096-7111 . https://doi.org/10.1002/ece3.5274
- Publication Year :
- 2019
- Publisher :
- Wiley, 2019.
-
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.
- Subjects :
- 0106 biological sciences
Atlantic salmon
secondary theorem of selection
INTENSE NATURAL-SELECTION
FITNESS-RELATED TRAITS
Biology
Body size
010603 evolutionary biology
01 natural sciences
SEXUAL SELECTION
03 medical and health sciences
lcsh:QH540-549.5
phenotypic selection
14. Life underwater
Population dynamics of fisheries
Ecology, Evolution, Behavior and Systematics
BODY-SIZE
Original Research
030304 developmental biology
Nature and Landscape Conservation
0303 health sciences
Ecology
Directional selection
pedigree
NORTH-ATLANTIC
ADAPTIVE EVOLUTION
atlantic salmon
Evolutionary biology
Sexual selection
SOCKEYE-SALMON
1181 Ecology, evolutionary biology
Breeder’s equation
lcsh:Ecology
SALMON SALMO-SALAR
Morphological trait
Adaptive evolution
Breeder's equation
Subjects
Details
- Language :
- English
- ISSN :
- 20457758
- Volume :
- 9
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- Ecology and Evolution
- Accession number :
- edsair.doi.dedup.....6c187bb8e482de0f75906fa952c16229