Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river
We used over 154 000 scale samples collected from salmon fisheries in the large River Teno system over a 40-year period to quantify life history diversity and long-term trends. We identified 120 different life history strategies, including combinations of smolt (2–8) and sea ages (1–5) and previous...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0343 |
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crcansciencepubl:10.1139/cjfas-2017-0343 2024-09-15T17:56:27+00:00 Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river Erkinaro, Jaakko Czorlich, Yann Orell, Panu Kuusela, Jorma Falkegård, Morten Länsman, Maija Pulkkinen, Henni Primmer, Craig R. Niemelä, Eero 2019 http://dx.doi.org/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0343 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 1, page 42-55 ISSN 0706-652X 1205-7533 journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjfas-2017-0343 2024-08-01T04:10:01Z We used over 154 000 scale samples collected from salmon fisheries in the large River Teno system over a 40-year period to quantify life history diversity and long-term trends. We identified 120 different life history strategies, including combinations of smolt (2–8) and sea ages (1–5) and previous spawning events. Most strategies were rare; 60% of individuals matured after 1 year at sea following 3–5 years in fresh water. Age at maturity changed with an increase in two-sea-winter salmon and previous spawners and a decline in three-sea-winter fish. Smolt age distribution showed a decreasing proportion of age-3 smolts, while that of age-5 smolts increased. Fishing gear and fishing season times selected for fish differing in life history strategies. Temporal variation in life histories reflected changes in both fisheries and the changing environment. There was an inverse relationship between years spent in fresh water and sea age. Biocomplexity was manifested by the multiple year classes (6–11) present in annual runs, which increased with years, reflecting an increase both in previous spawners and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generational overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect. Article in Journal/Newspaper Atlantic salmon Subarctic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 76 1 42 55 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We used over 154 000 scale samples collected from salmon fisheries in the large River Teno system over a 40-year period to quantify life history diversity and long-term trends. We identified 120 different life history strategies, including combinations of smolt (2–8) and sea ages (1–5) and previous spawning events. Most strategies were rare; 60% of individuals matured after 1 year at sea following 3–5 years in fresh water. Age at maturity changed with an increase in two-sea-winter salmon and previous spawners and a decline in three-sea-winter fish. Smolt age distribution showed a decreasing proportion of age-3 smolts, while that of age-5 smolts increased. Fishing gear and fishing season times selected for fish differing in life history strategies. Temporal variation in life histories reflected changes in both fisheries and the changing environment. There was an inverse relationship between years spent in fresh water and sea age. Biocomplexity was manifested by the multiple year classes (6–11) present in annual runs, which increased with years, reflecting an increase both in previous spawners and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generational overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect. |
format |
Article in Journal/Newspaper |
author |
Erkinaro, Jaakko Czorlich, Yann Orell, Panu Kuusela, Jorma Falkegård, Morten Länsman, Maija Pulkkinen, Henni Primmer, Craig R. Niemelä, Eero |
spellingShingle |
Erkinaro, Jaakko Czorlich, Yann Orell, Panu Kuusela, Jorma Falkegård, Morten Länsman, Maija Pulkkinen, Henni Primmer, Craig R. Niemelä, Eero Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
author_facet |
Erkinaro, Jaakko Czorlich, Yann Orell, Panu Kuusela, Jorma Falkegård, Morten Länsman, Maija Pulkkinen, Henni Primmer, Craig R. Niemelä, Eero |
author_sort |
Erkinaro, Jaakko |
title |
Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
title_short |
Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
title_full |
Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
title_fullStr |
Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
title_full_unstemmed |
Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river |
title_sort |
life history variation across four decades in a diverse population complex of atlantic salmon in a large subarctic river |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0343 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0343 |
genre |
Atlantic salmon Subarctic |
genre_facet |
Atlantic salmon Subarctic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 1, page 42-55 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2017-0343 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
76 |
container_issue |
1 |
container_start_page |
42 |
op_container_end_page |
55 |
_version_ |
1810432660392116224 |