Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar
Alternative reproductive tactics may be a product of adaptive phenotypic plasticity, such that discontinuous variation in life history depends on both the genotype and the environment. Phenotypes that fall below a genetically determined threshold adopt one tactic, while those exceeding the threshold...
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ftpubmed:oai:pubmedcentral.nih.gov:2602666 2023-05-15T15:31:00+02:00 Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar Piché, Jacinthe Hutchings, Jeffrey A Blanchard, Wade 2008-04-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602666 http://www.ncbi.nlm.nih.gov/pubmed/18426750 https://doi.org/10.1098/rspb.2008.0251 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602666 http://www.ncbi.nlm.nih.gov/pubmed/18426750 http://dx.doi.org/10.1098/rspb.2008.0251 © 2008 The Royal Society Research Article Text 2008 ftpubmed https://doi.org/10.1098/rspb.2008.0251 2013-09-02T08:48:03Z Alternative reproductive tactics may be a product of adaptive phenotypic plasticity, such that discontinuous variation in life history depends on both the genotype and the environment. Phenotypes that fall below a genetically determined threshold adopt one tactic, while those exceeding the threshold adopt the alternative tactic. We report evidence of genetic variability in maturation thresholds for male Atlantic salmon (Salmo salar) that mature either as large (more than 1 kg) anadromous males or as small (10–150 g) parr. Using a common-garden experimental protocol, we find that the growth rate at which the sneaker parr phenotype is expressed differs among pure- and mixed-population crosses. Maturation thresholds of hybrids were intermediate to those of pure crosses, consistent with the hypothesis that the life-history switch points are heritable. Our work provides evidence, for a vertebrate, that thresholds for alternative reproductive tactics differ genetically among populations and can be modelled as discontinuous reaction norms for age and size at maturity. Text Atlantic salmon Salmo salar PubMed Central (PMC) Proceedings of the Royal Society B: Biological Sciences 275 1642 1571 1575 |
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Research Article Piché, Jacinthe Hutchings, Jeffrey A Blanchard, Wade Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
topic_facet |
Research Article |
description |
Alternative reproductive tactics may be a product of adaptive phenotypic plasticity, such that discontinuous variation in life history depends on both the genotype and the environment. Phenotypes that fall below a genetically determined threshold adopt one tactic, while those exceeding the threshold adopt the alternative tactic. We report evidence of genetic variability in maturation thresholds for male Atlantic salmon (Salmo salar) that mature either as large (more than 1 kg) anadromous males or as small (10–150 g) parr. Using a common-garden experimental protocol, we find that the growth rate at which the sneaker parr phenotype is expressed differs among pure- and mixed-population crosses. Maturation thresholds of hybrids were intermediate to those of pure crosses, consistent with the hypothesis that the life-history switch points are heritable. Our work provides evidence, for a vertebrate, that thresholds for alternative reproductive tactics differ genetically among populations and can be modelled as discontinuous reaction norms for age and size at maturity. |
format |
Text |
author |
Piché, Jacinthe Hutchings, Jeffrey A Blanchard, Wade |
author_facet |
Piché, Jacinthe Hutchings, Jeffrey A Blanchard, Wade |
author_sort |
Piché, Jacinthe |
title |
Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
title_short |
Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
title_full |
Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
title_fullStr |
Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
title_full_unstemmed |
Genetic variation in threshold reaction norms for alternative reproductive tactics in male Atlantic salmon, Salmo salar |
title_sort |
genetic variation in threshold reaction norms for alternative reproductive tactics in male atlantic salmon, salmo salar |
publisher |
The Royal Society |
publishDate |
2008 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602666 http://www.ncbi.nlm.nih.gov/pubmed/18426750 https://doi.org/10.1098/rspb.2008.0251 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2602666 http://www.ncbi.nlm.nih.gov/pubmed/18426750 http://dx.doi.org/10.1098/rspb.2008.0251 |
op_rights |
© 2008 The Royal Society |
op_doi |
https://doi.org/10.1098/rspb.2008.0251 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
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275 |
container_issue |
1642 |
container_start_page |
1571 |
op_container_end_page |
1575 |
_version_ |
1766361481355460608 |