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Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon

While nonanadromous males (stream-resident and/or mature male parr) contribute to reproduction in anadromous salmonids, little is known about their impacts on key population genetic parameters. Here, we evaluated the contribution of Atlantic salmon mature male parr to the effective number of breeder...

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Autores principales: Perrier, Charles, Normandeau, Éric, Dionne, Mélanie, Richard, Antoine, Bernatchez, Louis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BlackWell Publishing Ltd 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4231598/
https://www.ncbi.nlm.nih.gov/pubmed/25553070
http://dx.doi.org/10.1111/eva.12172
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author Perrier, Charles
Normandeau, Éric
Dionne, Mélanie
Richard, Antoine
Bernatchez, Louis
author_facet Perrier, Charles
Normandeau, Éric
Dionne, Mélanie
Richard, Antoine
Bernatchez, Louis
author_sort Perrier, Charles
collection PubMed
description While nonanadromous males (stream-resident and/or mature male parr) contribute to reproduction in anadromous salmonids, little is known about their impacts on key population genetic parameters. Here, we evaluated the contribution of Atlantic salmon mature male parr to the effective number of breeders (Nb) using both demographic (variance in reproductive success) and genetic (linkage disequilibrium) methods, the number of alleles, and the relatedness among breeders. We used a recently published pedigree reconstruction of a wild anadromous Atlantic salmon population in which 2548 fry born in 2010 were assigned parentage to 144 anadromous female and 101 anadromous females that returned to the river to spawn in 2009 and to 462 mature male parr. Demographic and genetic methods revealed that mature male parr increased population Nb by 1.79 and 1.85 times, respectively. Moreover, mature male parr boosted the number of alleles found among progenies. Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort. By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations.
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spelling pubmed-42315982014-12-31 Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon Perrier, Charles Normandeau, Éric Dionne, Mélanie Richard, Antoine Bernatchez, Louis Evol Appl Original Articles While nonanadromous males (stream-resident and/or mature male parr) contribute to reproduction in anadromous salmonids, little is known about their impacts on key population genetic parameters. Here, we evaluated the contribution of Atlantic salmon mature male parr to the effective number of breeders (Nb) using both demographic (variance in reproductive success) and genetic (linkage disequilibrium) methods, the number of alleles, and the relatedness among breeders. We used a recently published pedigree reconstruction of a wild anadromous Atlantic salmon population in which 2548 fry born in 2010 were assigned parentage to 144 anadromous female and 101 anadromous females that returned to the river to spawn in 2009 and to 462 mature male parr. Demographic and genetic methods revealed that mature male parr increased population Nb by 1.79 and 1.85 times, respectively. Moreover, mature male parr boosted the number of alleles found among progenies. Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort. By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations. BlackWell Publishing Ltd 2014-11 2014-06-18 /pmc/articles/PMC4231598/ /pubmed/25553070 http://dx.doi.org/10.1111/eva.12172 Text en © 2014 John Wiley & Sons Ltd http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Perrier, Charles
Normandeau, Éric
Dionne, Mélanie
Richard, Antoine
Bernatchez, Louis
Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title_full Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title_fullStr Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title_full_unstemmed Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title_short Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon
title_sort alternative reproductive tactics increase effective population size and decrease inbreeding in wild atlantic salmon
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4231598/
https://www.ncbi.nlm.nih.gov/pubmed/25553070
http://dx.doi.org/10.1111/eva.12172
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