Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon?
Background: Mature male parr (MMP) represent an important alternative life-history strategy in Atlantic salmon populations. Previous studies indicate that the maturation size threshold for male parr varies among wild populations and is influenced by individual growth, environmental conditions, and g...
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Online Access: | http://hdl.handle.net/1956/20456 https://doi.org/10.1186/s12862-018-1294-y |
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ftunivbergen:oai:bora.uib.no:1956/20456 2023-05-15T15:32:00+02:00 Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? Harvey, Alison C. Skilbrei, Ove Tommy Besnier, Francois Solberg, Monica Favnebøe Sørvik, Anne Grete Eide Glover, Kevin 2019-03-05T12:45:22Z application/pdf http://hdl.handle.net/1956/20456 https://doi.org/10.1186/s12862-018-1294-y eng eng BioMed Central Norges forskningsråd: 200510 urn:issn:1471-2148 http://hdl.handle.net/1956/20456 https://doi.org/10.1186/s12862-018-1294-y cristin:1681984 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) BMC Evolutionary Biology Precocious males Hybridisation Fitness Growth Salmon Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.1186/s12862-018-1294-y 2023-03-14T17:39:57Z Background: Mature male parr (MMP) represent an important alternative life-history strategy in Atlantic salmon populations. Previous studies indicate that the maturation size threshold for male parr varies among wild populations and is influenced by individual growth, environmental conditions, and genetics. More than ten generations of breeding have resulted in domesticated salmon displaying many genetic differences to wild salmon, including greatly increased growth rates. This may have resulted in domesticated fish with the potential to outgrow the size threshold for early maturation, or evolution of the size threshold of the trait itself. To investigate this, we performed a common-garden experiment under farming conditions using 4680 salmon from 39 families representing four wild, two wild-domesticated hybrid, and two domesticated strains. Results: Domesticated salmon outgrew wild salmon 2–5-fold, and hybrids displayed intermediate growth. Overall, the numbers of MMP varied greatly among families and strains: averaging 4–12% in domesticated, 18–25% in hybrid, and 43–74% in the wild populations. However, when the influence of growth was accounted for, by dividing fish into lower and upper size modes, no difference in the incidence of MMP was detected among domesticated and wild strains in either size mode. In the lower size mode, hybrids displayed significantly lower incidences of mature males than their wild parental strains. No consistent differences in the body size of MMP, connected to domestication, was detected. Conclusions: Our data demonstrate: 1- no evidence for the evolution of the size threshold for MMP in domesticated salmon, 2- the vastly lower incidence of MMP in domesticated strains under aquaculture conditions is primarily due to their genetically increased growth rate causing them to outgrow the size threshold for early maturation, 3- the incidence of MMP is likely to overlap among domesticated and wild salmon in the natural habitat where they typically display overlapping growth, although ... Article in Journal/Newspaper Atlantic salmon University of Bergen: Bergen Open Research Archive (BORA-UiB) BMC Evolutionary Biology 18 1 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Precocious males Hybridisation Fitness Growth Salmon |
spellingShingle |
Precocious males Hybridisation Fitness Growth Salmon Harvey, Alison C. Skilbrei, Ove Tommy Besnier, Francois Solberg, Monica Favnebøe Sørvik, Anne Grete Eide Glover, Kevin Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
topic_facet |
Precocious males Hybridisation Fitness Growth Salmon |
description |
Background: Mature male parr (MMP) represent an important alternative life-history strategy in Atlantic salmon populations. Previous studies indicate that the maturation size threshold for male parr varies among wild populations and is influenced by individual growth, environmental conditions, and genetics. More than ten generations of breeding have resulted in domesticated salmon displaying many genetic differences to wild salmon, including greatly increased growth rates. This may have resulted in domesticated fish with the potential to outgrow the size threshold for early maturation, or evolution of the size threshold of the trait itself. To investigate this, we performed a common-garden experiment under farming conditions using 4680 salmon from 39 families representing four wild, two wild-domesticated hybrid, and two domesticated strains. Results: Domesticated salmon outgrew wild salmon 2–5-fold, and hybrids displayed intermediate growth. Overall, the numbers of MMP varied greatly among families and strains: averaging 4–12% in domesticated, 18–25% in hybrid, and 43–74% in the wild populations. However, when the influence of growth was accounted for, by dividing fish into lower and upper size modes, no difference in the incidence of MMP was detected among domesticated and wild strains in either size mode. In the lower size mode, hybrids displayed significantly lower incidences of mature males than their wild parental strains. No consistent differences in the body size of MMP, connected to domestication, was detected. Conclusions: Our data demonstrate: 1- no evidence for the evolution of the size threshold for MMP in domesticated salmon, 2- the vastly lower incidence of MMP in domesticated strains under aquaculture conditions is primarily due to their genetically increased growth rate causing them to outgrow the size threshold for early maturation, 3- the incidence of MMP is likely to overlap among domesticated and wild salmon in the natural habitat where they typically display overlapping growth, although ... |
format |
Article in Journal/Newspaper |
author |
Harvey, Alison C. Skilbrei, Ove Tommy Besnier, Francois Solberg, Monica Favnebøe Sørvik, Anne Grete Eide Glover, Kevin |
author_facet |
Harvey, Alison C. Skilbrei, Ove Tommy Besnier, Francois Solberg, Monica Favnebøe Sørvik, Anne Grete Eide Glover, Kevin |
author_sort |
Harvey, Alison C. |
title |
Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
title_short |
Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
title_full |
Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
title_fullStr |
Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
title_full_unstemmed |
Implications for introgression: Has selection for fast growth altered the size threshold for precocious male maturation in domesticated Atlantic salmon? |
title_sort |
implications for introgression: has selection for fast growth altered the size threshold for precocious male maturation in domesticated atlantic salmon? |
publisher |
BioMed Central |
publishDate |
2019 |
url |
http://hdl.handle.net/1956/20456 https://doi.org/10.1186/s12862-018-1294-y |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
BMC Evolutionary Biology |
op_relation |
Norges forskningsråd: 200510 urn:issn:1471-2148 http://hdl.handle.net/1956/20456 https://doi.org/10.1186/s12862-018-1294-y cristin:1681984 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) |
op_doi |
https://doi.org/10.1186/s12862-018-1294-y |
container_title |
BMC Evolutionary Biology |
container_volume |
18 |
container_issue |
1 |
_version_ |
1766362490216644608 |