Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system
Habitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and declines worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (Salmo trutta L.) is an ideal model species for studying an...
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ftdryad:oai:v1.datadryad.org:10255/dryad.212326 2023-05-15T17:54:41+02:00 Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system Klutsch, Cornelya F. C. Maduna, Simo N. Polikarpova, Natalia Forfang, Kristin Aspholm, Paul Eric Nyman, Tommi Eiken, Hans Geir Amundsen, Per-Arne Hagen, Snorre B. Norway 2019-05-02T13:33:14Z http://hdl.handle.net/10255/dryad.212326 https://doi.org/10.5061/dryad.45482t5 unknown doi:10.5061/dryad.45482t5/1 doi:10.1002/ece3.5191 doi:10.5061/dryad.45482t5 Klütsch CFC, Maduna SN, Polikarpova N, Forfang K, Aspholm PE, Nyman T, Eiken HG, Amundsen P, Hagen SB (2019) Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system. Ecology and Evolution. http://hdl.handle.net/10255/dryad.212326 fish stocking genetic erosion genetic diversity genetic integrity habitat fragmentation Article 2019 ftdryad https://doi.org/10.5061/dryad.45482t5 https://doi.org/10.5061/dryad.45482t5/1 https://doi.org/10.1002/ece3.5191 2020-01-01T16:26:20Z Habitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and declines worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (Salmo trutta L.) is an ideal model species for studying anthropogenic influences on genetic integrity, as it has experienced significant genetic alterations throughout its natural distribution range due to habitat fragmentation, overexploitation, translocations, and stocking. The Pasvik River is a subarctic riverine system shared between Norway, Russia and Finland, subdivided by seven hydroelectric power dams that destroyed about 70% of natural spawning and nursing areas. Stocking is applied in certain river parts to support the natural brown trout population. Adjacent river segments with different management strategies (stocked versus not stocked) facilitated the simultaneous assessment of genetic impacts of dams and stocking based on analyses of 16 short tandem repeat loci. Dams were expected to increase genetic differentiation between and reduce genetic diversity within river sections. Contrastingly, stocking was predicted to promote genetic homogenization and diversity, but also potentially lead to loss of private alleles and to genetic erosion. Our results showed comparatively low heterozygosity and clear genetic differentiation between adjacent sections in non-stocked river parts, indicating that dams prevent migration and contribute to genetic isolation and loss of genetic diversity. Furthermore, genetic differentiation was low and heterozygosity relatively high across stocked sections. However, in stocked river sections, we found signatures of recent bottlenecks and reductions in private alleles, indicating that only a subset of individuals contribute to reproduction, potentially leading to divergence away from the natural genetic state. Taken together, these results indicate that stocking counteracts the negative fragmentation effects of dams, but also that stocking practices should be planned carefully in order to ensure long-term preservation of natural genetic diversity and integrity in brown trout and other species in regulated river systems. Article in Journal/Newspaper Pasvik Subarctic Dryad Digital Repository (Duke University) Norway Pasvik ENVELOPE(30.580,30.580,69.810,69.810) |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
fish stocking genetic erosion genetic diversity genetic integrity habitat fragmentation |
spellingShingle |
fish stocking genetic erosion genetic diversity genetic integrity habitat fragmentation Klutsch, Cornelya F. C. Maduna, Simo N. Polikarpova, Natalia Forfang, Kristin Aspholm, Paul Eric Nyman, Tommi Eiken, Hans Geir Amundsen, Per-Arne Hagen, Snorre B. Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
topic_facet |
fish stocking genetic erosion genetic diversity genetic integrity habitat fragmentation |
description |
Habitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and declines worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (Salmo trutta L.) is an ideal model species for studying anthropogenic influences on genetic integrity, as it has experienced significant genetic alterations throughout its natural distribution range due to habitat fragmentation, overexploitation, translocations, and stocking. The Pasvik River is a subarctic riverine system shared between Norway, Russia and Finland, subdivided by seven hydroelectric power dams that destroyed about 70% of natural spawning and nursing areas. Stocking is applied in certain river parts to support the natural brown trout population. Adjacent river segments with different management strategies (stocked versus not stocked) facilitated the simultaneous assessment of genetic impacts of dams and stocking based on analyses of 16 short tandem repeat loci. Dams were expected to increase genetic differentiation between and reduce genetic diversity within river sections. Contrastingly, stocking was predicted to promote genetic homogenization and diversity, but also potentially lead to loss of private alleles and to genetic erosion. Our results showed comparatively low heterozygosity and clear genetic differentiation between adjacent sections in non-stocked river parts, indicating that dams prevent migration and contribute to genetic isolation and loss of genetic diversity. Furthermore, genetic differentiation was low and heterozygosity relatively high across stocked sections. However, in stocked river sections, we found signatures of recent bottlenecks and reductions in private alleles, indicating that only a subset of individuals contribute to reproduction, potentially leading to divergence away from the natural genetic state. Taken together, these results indicate that stocking counteracts the negative fragmentation effects of dams, but also that stocking practices should be planned carefully in order to ensure long-term preservation of natural genetic diversity and integrity in brown trout and other species in regulated river systems. |
format |
Article in Journal/Newspaper |
author |
Klutsch, Cornelya F. C. Maduna, Simo N. Polikarpova, Natalia Forfang, Kristin Aspholm, Paul Eric Nyman, Tommi Eiken, Hans Geir Amundsen, Per-Arne Hagen, Snorre B. |
author_facet |
Klutsch, Cornelya F. C. Maduna, Simo N. Polikarpova, Natalia Forfang, Kristin Aspholm, Paul Eric Nyman, Tommi Eiken, Hans Geir Amundsen, Per-Arne Hagen, Snorre B. |
author_sort |
Klutsch, Cornelya F. C. |
title |
Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
title_short |
Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
title_full |
Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
title_fullStr |
Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
title_full_unstemmed |
Data from: Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
title_sort |
data from: genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system |
publishDate |
2019 |
url |
http://hdl.handle.net/10255/dryad.212326 https://doi.org/10.5061/dryad.45482t5 |
op_coverage |
Norway |
long_lat |
ENVELOPE(30.580,30.580,69.810,69.810) |
geographic |
Norway Pasvik |
geographic_facet |
Norway Pasvik |
genre |
Pasvik Subarctic |
genre_facet |
Pasvik Subarctic |
op_relation |
doi:10.5061/dryad.45482t5/1 doi:10.1002/ece3.5191 doi:10.5061/dryad.45482t5 Klütsch CFC, Maduna SN, Polikarpova N, Forfang K, Aspholm PE, Nyman T, Eiken HG, Amundsen P, Hagen SB (2019) Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system. Ecology and Evolution. http://hdl.handle.net/10255/dryad.212326 |
op_doi |
https://doi.org/10.5061/dryad.45482t5 https://doi.org/10.5061/dryad.45482t5/1 https://doi.org/10.1002/ece3.5191 |
_version_ |
1766162481612324864 |