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Lookup NU author(s): Dr Evelyn JensenORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2014 The Authors.Seasonal declines of fitness-related traits are often attributed to environmental effects or individual-level decisions about reproductive timing and effort, but genetic variation may also play a role. In populations of Pacific salmon (Oncorhynchus spp.), seasonal declines in reproductive life span have been attributed to adaptation-by-time, in which divergent selection for different traits occurs among reproductively isolated temporal components of a population. We evaluated this hypothesis in kokanee (freshwater obligate Oncorhynchus nerka) by testing for temporal genetic structure in neutral and circadian-linked loci. We detected no genetic differences in presumably neutral loci among kokanee with different arrival and maturation dates within a spawning season. Similarly, we detected no temporal genetic structure in OtsClock1b, Omy1009uw, or OmyFbxw11, candidate loci associated with circadian function. The genetic evidence from this study and others indicates a lack of support for adaptation-by-time as an important evolutionary mechanism underlying seasonal declines in reproductive life span and a need for greater consideration of other mechanisms such as time-dependent, adaptive adjustment of reproductive effort.
Author(s): Morbey YE, Jensen EL, Russello MA
Publication type: Article
Publication status: Published
Journal: Ecology and Evolution
Year: 2014
Volume: 4
Issue: 18
Pages: 3714-3722
Print publication date: 01/09/2014
Online publication date: 05/09/2014
Acceptance date: 30/07/2014
Date deposited: 06/12/2021
ISSN (electronic): 2045-7758
Publisher: John Wiley and Sons Ltd
URL: https://doi.org/10.1002/ece3.1214
DOI: 10.1002/ece3.1214
Data Access Statement: http://dx.doi.org/10.5061/dryad.98c48
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