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• W2890728328 abstract "Abstract Genetic correlations in life history traits may result in unpredictable evolutionary trajectories if not accounted for in life-history models. Iteroparity (the reproductive strategy of reproducing more than once) in Atlantic salmon ( Salmo salar ) is a fitness trait with substantial variation within and among populations. In the Teno River in northern Europe, iteroparous individuals constitute an important component of many populations and have experienced a sharp increase in abundance in the last 20 years, partly overlapping with a general decrease in age structure. The physiological basis of iteroparity bears similarities to that of age at first maturity, another life history trait with substantial fitness effects in salmon. Sea age at maturity in Atlantic salmon is controlled by a major locus around the vgll3 gene, and we used this opportunity demonstrate that the two traits are genetically correlated around this genome region. The odds ratio of survival until second reproduction was up to 2.4 (1.8-3.5 90% CI) times higher for fish with the early-maturing vgll3 genotype ( EE ) compared to fish with the late-maturing genotype (LL ). The association had a dominance architecture, although the dominant allele was reversed in the late-maturing group compared to younger groups that stayed only one year at sea before maturation. Post hoc analysis indicated that iteroparous fish with the EE genotype had accelerated growth prior to first reproduction compared to first-time spawners, across all age groups, while this effect was not detected in fish with the LL genotype. These results broaden the functional link around the vgll3 genome region and help us understand constraints in the evolution of life history variation in salmon. Our results further highlight the need to account for genetic correlations between fitness traits when predicting demographic changes in changing environments." @default.
• W2890728328 created "2018-09-27" @default.
• W2890728328 creator A5002140788 @default.
• W2890728328 creator A5005096188 @default.
• W2890728328 creator A5009654736 @default.
• W2890728328 creator A5023581831 @default.
• W2890728328 creator A5032121794 @default.
• W2890728328 creator A5040425437 @default.
• W2890728328 creator A5040472465 @default.
• W2890728328 date "2018-09-10" @default.
• W2890728328 modified "2023-10-16" @default.
• W2890728328 title "Genetic correlation between sea age at maturity and iteroparity in Atlantic salmon" @default.
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