Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity
The release of captive-bred animals into the wild is commonly practised to restore or supplement wild populations but comes with a suite of ecological and genetic consequences. Vast numbers of hatchery-reared fish are released annually, ostensibly to restore/enhance wild populations or provide great...
Published in: | Proceedings of the Royal Society B: Biological Sciences |
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Online Access: | https://www.utupub.fi/handle/10024/157586 https://doi.org/10.1098/rspb.2020.1671 |
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ftunivturku:oai:www.utupub.fi:10024/157586 2023-05-15T15:31:25+02:00 Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity Primmer CR Prodohl PA Poole R de Eyto E O'Sullivan RJ Aykanat T Rogan G Johnston SE McGinnity P Reed TE fysiologia ja genetiikka, Physiology and Genetics 2606404 2022-10-27T12:17:26Z https://www.utupub.fi/handle/10024/157586 https://doi.org/10.1098/rspb.2020.1671 en eng ROYAL SOC Britannia United Kingdom GB 287 ARTN 20201671 10.1098/rspb.2020.1671 Proceedings of the Royal Society B: Biological Sciences 1937 https://www.utupub.fi/handle/10024/157586 https://doi.org/10.1098/rspb.2020.1671 URN:NBN:fi-fe2021042823011 1471-2954 0962-8452 2022 ftunivturku https://doi.org/10.1098/rspb.2020.1671 2022-11-02T23:59:22Z The release of captive-bred animals into the wild is commonly practised to restore or supplement wild populations but comes with a suite of ecological and genetic consequences. Vast numbers of hatchery-reared fish are released annually, ostensibly to restore/enhance wild populations or provide greater angling returns. While previous studies have shown that captive-bred fish perform poorly in the wild relative to wild-bred conspecifics, few have measured individual lifetime reproductive success (LRS) and how this affects population productivity. Here, we analyse data on Atlantic salmon from an intensely studied catchment into which varying numbers of captive-bred fish have escaped/been released and potentially bred over several decades. Using a molecular pedigree, we demonstrate that, on average, the LRS of captive-bred individuals was only 36% that of wild-bred individuals. A significant LRS difference remained after excluding individuals that left no surviving offspring, some of which might have simply failed to spawn, consistent with transgenerational effects on offspring survival. The annual productivity of the mixed population (wild-bred plus captive-bred) was lower in years where captive-bred fish comprised a greater fraction of potential spawners. These results bolster previous empirical and theoretical findings that intentional stocking, or non-intentional escapees, threaten, rather than enhance, recipient natural populations. Other/Unknown Material Atlantic salmon University of Turku: UTUPub Proceedings of the Royal Society B: Biological Sciences 287 1937 20201671 |
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collection |
University of Turku: UTUPub |
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ftunivturku |
language |
English |
description |
The release of captive-bred animals into the wild is commonly practised to restore or supplement wild populations but comes with a suite of ecological and genetic consequences. Vast numbers of hatchery-reared fish are released annually, ostensibly to restore/enhance wild populations or provide greater angling returns. While previous studies have shown that captive-bred fish perform poorly in the wild relative to wild-bred conspecifics, few have measured individual lifetime reproductive success (LRS) and how this affects population productivity. Here, we analyse data on Atlantic salmon from an intensely studied catchment into which varying numbers of captive-bred fish have escaped/been released and potentially bred over several decades. Using a molecular pedigree, we demonstrate that, on average, the LRS of captive-bred individuals was only 36% that of wild-bred individuals. A significant LRS difference remained after excluding individuals that left no surviving offspring, some of which might have simply failed to spawn, consistent with transgenerational effects on offspring survival. The annual productivity of the mixed population (wild-bred plus captive-bred) was lower in years where captive-bred fish comprised a greater fraction of potential spawners. These results bolster previous empirical and theoretical findings that intentional stocking, or non-intentional escapees, threaten, rather than enhance, recipient natural populations. |
author2 |
fysiologia ja genetiikka, Physiology and Genetics 2606404 |
author |
Primmer CR Prodohl PA Poole R de Eyto E O'Sullivan RJ Aykanat T Rogan G Johnston SE McGinnity P Reed TE |
spellingShingle |
Primmer CR Prodohl PA Poole R de Eyto E O'Sullivan RJ Aykanat T Rogan G Johnston SE McGinnity P Reed TE Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
author_facet |
Primmer CR Prodohl PA Poole R de Eyto E O'Sullivan RJ Aykanat T Rogan G Johnston SE McGinnity P Reed TE |
author_sort |
Primmer CR |
title |
Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
title_short |
Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
title_full |
Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
title_fullStr |
Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
title_full_unstemmed |
Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
title_sort |
captive-bred atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population productivity |
publisher |
ROYAL SOC |
publishDate |
2022 |
url |
https://www.utupub.fi/handle/10024/157586 https://doi.org/10.1098/rspb.2020.1671 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
287 ARTN 20201671 10.1098/rspb.2020.1671 Proceedings of the Royal Society B: Biological Sciences 1937 https://www.utupub.fi/handle/10024/157586 https://doi.org/10.1098/rspb.2020.1671 URN:NBN:fi-fe2021042823011 1471-2954 0962-8452 |
op_doi |
https://doi.org/10.1098/rspb.2020.1671 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
287 |
container_issue |
1937 |
container_start_page |
20201671 |
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1766361913314246656 |