Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation
The river-resident Salmo salar (“småblank”) has been isolated from other Atlantic salmon populations for 9,500 years in upper River Namsen, Norway. This is the only European Atlantic salmon population accomplishing its entire life cycle in a river. Hydropower development during the last six decades...
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2461263 2023-05-15T15:29:34+02:00 Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation Sandlund, Odd Terje Karlsson, Sten Thorstad, Eva Bonsak Berg, Ole Kristian Kent, Matthew Peter Norum, Ine Cecilie Jordalen Hindar, Kjetil 2014 http://hdl.handle.net/11250/2461263 https://doi.org/10.1002/ece3.1040 eng eng Wiley Open Access Ecology and Evolution. 2014, 4 (9), 1538-1554. urn:issn:2045-7758 http://hdl.handle.net/11250/2461263 https://doi.org/10.1002/ece3.1040 cristin:1127733 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 1538-1554 4 Ecology and Evolution 9 Journal article Peer reviewed 2014 ftntnutrondheimi https://doi.org/10.1002/ece3.1040 2019-09-17T06:53:00Z The river-resident Salmo salar (“småblank”) has been isolated from other Atlantic salmon populations for 9,500 years in upper River Namsen, Norway. This is the only European Atlantic salmon population accomplishing its entire life cycle in a river. Hydropower development during the last six decades has introduced movement barriers and changed more than 50% of the river habitat to lentic conditions. Based on microsatellites and SNPs, genetic variation within småblank was only about 50% of that in the anadromous Atlantic salmon within the same river. The genetic differentiation (FST) between småblank and the anadromous population was 0.24. This is similar to the differentiation between anadromous Atlantic salmon in Europe and North America. Microsatellite analyses identified three genetic subpopulations within småblank, each with an effective population size Ne of a few hundred individuals. There was no evidence of reduced heterozygosity and allelic richness in contemporary samples (2005–2008) compared with historical samples (1955–56 and 1978–79). However, there was a reduction in genetic differentiation between sampling localities over time. SNP data supported the differentiation of småblank into subpopulations and revealed downstream asymmetric gene flow between subpopulations. In spite of this, genetic variation was not higher in the lower than in the upper areas. The meta-population structure of småblank probably maintains genetic variation better than one panmictic population would do, as long as gene flow among subpopulations is maintained. Småblank is a unique endemic island population of Atlantic salmon. It is in a precarious situation due to a variety of anthropogenic impacts on its restricted habitat area. Thus, maintaining population size and avoiding further habitat fragmentation are important. publishedVersion © 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (CC BY 3.0) (https://creativecommons.org/licenses/by/3.0/) Article in Journal/Newspaper Atlantic salmon Salmo salar NTNU Open Archive (Norwegian University of Science and Technology) Norway Ecology and Evolution 4 9 1538 1554 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
The river-resident Salmo salar (“småblank”) has been isolated from other Atlantic salmon populations for 9,500 years in upper River Namsen, Norway. This is the only European Atlantic salmon population accomplishing its entire life cycle in a river. Hydropower development during the last six decades has introduced movement barriers and changed more than 50% of the river habitat to lentic conditions. Based on microsatellites and SNPs, genetic variation within småblank was only about 50% of that in the anadromous Atlantic salmon within the same river. The genetic differentiation (FST) between småblank and the anadromous population was 0.24. This is similar to the differentiation between anadromous Atlantic salmon in Europe and North America. Microsatellite analyses identified three genetic subpopulations within småblank, each with an effective population size Ne of a few hundred individuals. There was no evidence of reduced heterozygosity and allelic richness in contemporary samples (2005–2008) compared with historical samples (1955–56 and 1978–79). However, there was a reduction in genetic differentiation between sampling localities over time. SNP data supported the differentiation of småblank into subpopulations and revealed downstream asymmetric gene flow between subpopulations. In spite of this, genetic variation was not higher in the lower than in the upper areas. The meta-population structure of småblank probably maintains genetic variation better than one panmictic population would do, as long as gene flow among subpopulations is maintained. Småblank is a unique endemic island population of Atlantic salmon. It is in a precarious situation due to a variety of anthropogenic impacts on its restricted habitat area. Thus, maintaining population size and avoiding further habitat fragmentation are important. publishedVersion © 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (CC BY 3.0) (https://creativecommons.org/licenses/by/3.0/) |
format |
Article in Journal/Newspaper |
author |
Sandlund, Odd Terje Karlsson, Sten Thorstad, Eva Bonsak Berg, Ole Kristian Kent, Matthew Peter Norum, Ine Cecilie Jordalen Hindar, Kjetil |
spellingShingle |
Sandlund, Odd Terje Karlsson, Sten Thorstad, Eva Bonsak Berg, Ole Kristian Kent, Matthew Peter Norum, Ine Cecilie Jordalen Hindar, Kjetil Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
author_facet |
Sandlund, Odd Terje Karlsson, Sten Thorstad, Eva Bonsak Berg, Ole Kristian Kent, Matthew Peter Norum, Ine Cecilie Jordalen Hindar, Kjetil |
author_sort |
Sandlund, Odd Terje |
title |
Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
title_short |
Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
title_full |
Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
title_fullStr |
Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
title_full_unstemmed |
Spatial and temporal genetic structure of a river-resident Atlantic salmon (Salmo salar) after millennia of isolation |
title_sort |
spatial and temporal genetic structure of a river-resident atlantic salmon (salmo salar) after millennia of isolation |
publisher |
Wiley Open Access |
publishDate |
2014 |
url |
http://hdl.handle.net/11250/2461263 https://doi.org/10.1002/ece3.1040 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
1538-1554 4 Ecology and Evolution 9 |
op_relation |
Ecology and Evolution. 2014, 4 (9), 1538-1554. urn:issn:2045-7758 http://hdl.handle.net/11250/2461263 https://doi.org/10.1002/ece3.1040 cristin:1127733 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.1040 |
container_title |
Ecology and Evolution |
container_volume |
4 |
container_issue |
9 |
container_start_page |
1538 |
op_container_end_page |
1554 |
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1766359996515221504 |