Evaluation of genetic effects on wild salmon populations from stock enhancement
Many salmonid populations are of conservation concern, and the release of hatchery-produced juveniles is a frequently used measure to alleviate declines and increase harvest opportunities. While such releases may be of conservation value for some populations, stocking may also decrease the effective...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/3055738 https://doi.org/10.1093/icesjms/fsaa235 |
id |
ftninstnf:oai:brage.nina.no:11250/3055738 |
---|---|
record_format |
openpolar |
spelling |
ftninstnf:oai:brage.nina.no:11250/3055738 2023-05-15T15:30:51+02:00 Evaluation of genetic effects on wild salmon populations from stock enhancement Hagen, Ingerid Julie Ugedal, Ola Jensen, Arne Johan Lo, Håvard Holthe, Espen Bjøru, Bjørn Florø-Larsen, Bjørn Sægrov, Harald Skoglund, Helge Karlsson, Sten 2020 application/pdf https://hdl.handle.net/11250/3055738 https://doi.org/10.1093/icesjms/fsaa235 eng eng Andre: Flekke Elveeigarlag Andre: Statkraft AS Andre: Sognekraft AS Egen institusjon: Norwegian institute for nature research (NINA) Andre: Norwegian Environment Agency urn:issn:1054-3139 https://hdl.handle.net/11250/3055738 https://doi.org/10.1093/icesjms/fsaa235 cristin:1865013 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2020 International Council for the Exploration of the Sea 2020 CC-BY 900-909 78 ICES Journal of Marine Science 3 Atlantic salmon effective population size population genetics Ryman–Laikre effect Salmo salar stocking VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Peer reviewed Journal article 2020 ftninstnf https://doi.org/10.1093/icesjms/fsaa235 2023-03-08T23:46:24Z Many salmonid populations are of conservation concern, and the release of hatchery-produced juveniles is a frequently used measure to alleviate declines and increase harvest opportunities. While such releases may be of conservation value for some populations, stocking may also decrease the effective population size and subsequently impose additional strain on already threatened populations. In this study, we assessed how the cohort-wise effective number of breeders in five populations of Atlantic salmon (Salmo salar) were affected by supplementation. Altogether, 19 cohorts were studied (2–7 cohorts per population) by estimating the proportion hatchery-released individuals and the effective number of wild and captive breeders in each cohort of the respective populations. We show that the effect of releasing captive-bred individuals varies both between populations and between years within the same population. A Ryman–Laikre effect—where the effective number of breeders has decreased as a consequence of supplementation—was observed for 11 cohorts. We discuss how supplementation can be adapted to optimize the effective population size, demonstrate that evaluation of supplementation can be reliably achieved, and show that supplementation programmes that lead to high proportions of hatchery-origin fish on spawning grounds are more likely to induce a Ryman–Laikre effect. Atlantic salmon, effective population size, population genetics, Ryman–Laikre effect, Salmo salar, stocking publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Norwegian Institute for Nature Research: Brage NINA ICES Journal of Marine Science 78 3 900 909 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Atlantic salmon effective population size population genetics Ryman–Laikre effect Salmo salar stocking VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
Atlantic salmon effective population size population genetics Ryman–Laikre effect Salmo salar stocking VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Hagen, Ingerid Julie Ugedal, Ola Jensen, Arne Johan Lo, Håvard Holthe, Espen Bjøru, Bjørn Florø-Larsen, Bjørn Sægrov, Harald Skoglund, Helge Karlsson, Sten Evaluation of genetic effects on wild salmon populations from stock enhancement |
topic_facet |
Atlantic salmon effective population size population genetics Ryman–Laikre effect Salmo salar stocking VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
description |
Many salmonid populations are of conservation concern, and the release of hatchery-produced juveniles is a frequently used measure to alleviate declines and increase harvest opportunities. While such releases may be of conservation value for some populations, stocking may also decrease the effective population size and subsequently impose additional strain on already threatened populations. In this study, we assessed how the cohort-wise effective number of breeders in five populations of Atlantic salmon (Salmo salar) were affected by supplementation. Altogether, 19 cohorts were studied (2–7 cohorts per population) by estimating the proportion hatchery-released individuals and the effective number of wild and captive breeders in each cohort of the respective populations. We show that the effect of releasing captive-bred individuals varies both between populations and between years within the same population. A Ryman–Laikre effect—where the effective number of breeders has decreased as a consequence of supplementation—was observed for 11 cohorts. We discuss how supplementation can be adapted to optimize the effective population size, demonstrate that evaluation of supplementation can be reliably achieved, and show that supplementation programmes that lead to high proportions of hatchery-origin fish on spawning grounds are more likely to induce a Ryman–Laikre effect. Atlantic salmon, effective population size, population genetics, Ryman–Laikre effect, Salmo salar, stocking publishedVersion |
format |
Article in Journal/Newspaper |
author |
Hagen, Ingerid Julie Ugedal, Ola Jensen, Arne Johan Lo, Håvard Holthe, Espen Bjøru, Bjørn Florø-Larsen, Bjørn Sægrov, Harald Skoglund, Helge Karlsson, Sten |
author_facet |
Hagen, Ingerid Julie Ugedal, Ola Jensen, Arne Johan Lo, Håvard Holthe, Espen Bjøru, Bjørn Florø-Larsen, Bjørn Sægrov, Harald Skoglund, Helge Karlsson, Sten |
author_sort |
Hagen, Ingerid Julie |
title |
Evaluation of genetic effects on wild salmon populations from stock enhancement |
title_short |
Evaluation of genetic effects on wild salmon populations from stock enhancement |
title_full |
Evaluation of genetic effects on wild salmon populations from stock enhancement |
title_fullStr |
Evaluation of genetic effects on wild salmon populations from stock enhancement |
title_full_unstemmed |
Evaluation of genetic effects on wild salmon populations from stock enhancement |
title_sort |
evaluation of genetic effects on wild salmon populations from stock enhancement |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/3055738 https://doi.org/10.1093/icesjms/fsaa235 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
900-909 78 ICES Journal of Marine Science 3 |
op_relation |
Andre: Flekke Elveeigarlag Andre: Statkraft AS Andre: Sognekraft AS Egen institusjon: Norwegian institute for nature research (NINA) Andre: Norwegian Environment Agency urn:issn:1054-3139 https://hdl.handle.net/11250/3055738 https://doi.org/10.1093/icesjms/fsaa235 cristin:1865013 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2020 International Council for the Exploration of the Sea 2020 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/icesjms/fsaa235 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
3 |
container_start_page |
900 |
op_container_end_page |
909 |
_version_ |
1766361314554281984 |