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Time scale matters: Genetic analysis does not support adaptation-by-time as the mechanism for adaptive seasonal declines in kokanee reproductive life span

Lookup NU author(s): Dr Evelyn Jensen

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 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.


Publication metadata

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


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