Iteroparity and its contribution to life-history variation in Atlantic salmon
Evolution of iteroparity is shaped by the trade-off between current and future reproduction. We studied variation in iteroparity among 205 050 individual Atlantic salmon caught in 179 rivers spanning 14° of latitude. The proportion of repeat spawners (iteroparous individuals) averaged 3.8% and range...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
2023
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Online Access: | http://dx.doi.org/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0126 |
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crcansciencepubl:10.1139/cjfas-2022-0126 2024-06-23T07:51:16+00:00 Iteroparity and its contribution to life-history variation in Atlantic salmon Persson, Lo Raunsgard, Astrid Thorstad, Eva B. Østborg, Gunnel Urdal, Kurt Sægrov, Harald Ugedal, Ola Hindar, Kjetil Karlsson, Sten Fiske, Peder Bolstad, Geir H. 2023 http://dx.doi.org/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0126 en eng Canadian Science Publishing https://creativecommons.org/licenses/by/4.0/deed.en_GB Canadian Journal of Fisheries and Aquatic Sciences volume 80, issue 3, page 577-592 ISSN 0706-652X 1205-7533 journal-article 2023 crcansciencepubl https://doi.org/10.1139/cjfas-2022-0126 2024-06-13T04:10:52Z Evolution of iteroparity is shaped by the trade-off between current and future reproduction. We studied variation in iteroparity among 205 050 individual Atlantic salmon caught in 179 rivers spanning 14° of latitude. The proportion of repeat spawners (iteroparous individuals) averaged 3.8% and ranged from 0% to 26% across rivers. Females were more often repeat spawners than males and had lower cost of reproduction in terms of lost body mass between spawning events. Proportion of repeat spawners for a given sea age at maturity, and the ratio of alternate to consecutive repeat spawners, increased with increasing population mean sea age at maturity. By combining smolt age, sea age at maturity, and age at additional spawning events, we identified 141 unique life-history types, and repeat spawners contributed 75% of that variation. Our results show that repeat spawners are important for life-history variation and suggest that the association between mean sea age and the frequency of repeat spawning is adaptive rather than a pleiotropic side effect arising from selection on sea age. Article in Journal/Newspaper Atlantic salmon Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Evolution of iteroparity is shaped by the trade-off between current and future reproduction. We studied variation in iteroparity among 205 050 individual Atlantic salmon caught in 179 rivers spanning 14° of latitude. The proportion of repeat spawners (iteroparous individuals) averaged 3.8% and ranged from 0% to 26% across rivers. Females were more often repeat spawners than males and had lower cost of reproduction in terms of lost body mass between spawning events. Proportion of repeat spawners for a given sea age at maturity, and the ratio of alternate to consecutive repeat spawners, increased with increasing population mean sea age at maturity. By combining smolt age, sea age at maturity, and age at additional spawning events, we identified 141 unique life-history types, and repeat spawners contributed 75% of that variation. Our results show that repeat spawners are important for life-history variation and suggest that the association between mean sea age and the frequency of repeat spawning is adaptive rather than a pleiotropic side effect arising from selection on sea age. |
format |
Article in Journal/Newspaper |
author |
Persson, Lo Raunsgard, Astrid Thorstad, Eva B. Østborg, Gunnel Urdal, Kurt Sægrov, Harald Ugedal, Ola Hindar, Kjetil Karlsson, Sten Fiske, Peder Bolstad, Geir H. |
spellingShingle |
Persson, Lo Raunsgard, Astrid Thorstad, Eva B. Østborg, Gunnel Urdal, Kurt Sægrov, Harald Ugedal, Ola Hindar, Kjetil Karlsson, Sten Fiske, Peder Bolstad, Geir H. Iteroparity and its contribution to life-history variation in Atlantic salmon |
author_facet |
Persson, Lo Raunsgard, Astrid Thorstad, Eva B. Østborg, Gunnel Urdal, Kurt Sægrov, Harald Ugedal, Ola Hindar, Kjetil Karlsson, Sten Fiske, Peder Bolstad, Geir H. |
author_sort |
Persson, Lo |
title |
Iteroparity and its contribution to life-history variation in Atlantic salmon |
title_short |
Iteroparity and its contribution to life-history variation in Atlantic salmon |
title_full |
Iteroparity and its contribution to life-history variation in Atlantic salmon |
title_fullStr |
Iteroparity and its contribution to life-history variation in Atlantic salmon |
title_full_unstemmed |
Iteroparity and its contribution to life-history variation in Atlantic salmon |
title_sort |
iteroparity and its contribution to life-history variation in atlantic salmon |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2022-0126 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2022-0126 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 80, issue 3, page 577-592 ISSN 0706-652X 1205-7533 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.en_GB |
op_doi |
https://doi.org/10.1139/cjfas-2022-0126 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
_version_ |
1802642313949741056 |