Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river

Jaakko Erkinaro, Yann Czorlich, Panu Orell, Jorma Kuusela, Morten Falkegård, Maija Länsman, Henni Pulkkinen, Craig Primmer, Eero Niemelä

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We used over 154000 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 one year at sea following 3-5 years in freshwater. Age at maturity has changed with an increase in two-sea-winter (2SW) salmon and previous spawners (PS), and a decline in 3SW fish. Smolt age distribution showed a decreasing proportion of age-3 smolts while that of age-5 increased. Fishing gear and fishing season times selected for fish differing in life-history strategies. Temporal variation in life histories reflects changes both in fisheries and the changing environment. There was an inverse relationship between years spent in freshwater and sea age. Biocomplexity was manifested by the multiple year classes (6-11) present in annual runs that increased with years, reflecting an increase both in PS and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generation overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect.
Alkuperäiskielienglanti
LehtiCanadian Journal of Fisheries and Aquatic Sciences
Vuosikerta76
Numero1
Sivut42-55
Sivumäärä14
ISSN0706-652X
DOI - pysyväislinkit
TilaJulkaistu - tammikuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 1172 Ympäristötiede
  • 114 Fysiikka

Lainaa tätä

Erkinaro, Jaakko ; Czorlich, Yann ; Orell, Panu ; Kuusela, Jorma ; Falkegård, Morten ; Länsman, Maija ; Pulkkinen, Henni ; Primmer, Craig ; Niemelä, Eero. / Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river. Julkaisussa: Canadian Journal of Fisheries and Aquatic Sciences. 2019 ; Vuosikerta 76, Nro 1. Sivut 42-55.
@article{c75634ec944144d5adc8398d640470bc,
title = "Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river",
abstract = "We used over 154000 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 one year at sea following 3-5 years in freshwater. Age at maturity has changed with an increase in two-sea-winter (2SW) salmon and previous spawners (PS), and a decline in 3SW fish. Smolt age distribution showed a decreasing proportion of age-3 smolts while that of age-5 increased. Fishing gear and fishing season times selected for fish differing in life-history strategies. Temporal variation in life histories reflects changes both in fisheries and the changing environment. There was an inverse relationship between years spent in freshwater and sea age. Biocomplexity was manifested by the multiple year classes (6-11) present in annual runs that increased with years, reflecting an increase both in PS and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generation overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect.",
keywords = "1172 Environmental sciences, 114 Physical sciences, CLIMATE-CHANGE, TEMPORAL VARIATION, GENETIC-STRUCTURE, MIRAMICHI RIVER, NORTH-ATLANTIC, BARENTS SEA, MALE PARR, SALAR, FISH, AGE",
author = "Jaakko Erkinaro and Yann Czorlich and Panu Orell and Jorma Kuusela and Morten Falkeg{\aa}rd and Maija L{\"a}nsman and Henni Pulkkinen and Craig Primmer and Eero Niemel{\"a}",
year = "2019",
month = "1",
doi = "10.1139/cjfas-2017-0343",
language = "English",
volume = "76",
pages = "42--55",
journal = "Canadian Journal of Fisheries and Aquatic Sciences",
issn = "0706-652X",
publisher = "Nrc research press",
number = "1",

}

Erkinaro, J, Czorlich, Y, Orell, P, Kuusela, J, Falkegård, M, Länsman, M, Pulkkinen, H, Primmer, C & Niemelä, E 2019, 'Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river', Canadian Journal of Fisheries and Aquatic Sciences, Vuosikerta 76, Nro 1, Sivut 42-55. https://doi.org/10.1139/cjfas-2017-0343

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; Niemelä, Eero.

julkaisussa: Canadian Journal of Fisheries and Aquatic Sciences, Vuosikerta 76, Nro 1, 01.2019, s. 42-55.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river

AU - Erkinaro, Jaakko

AU - Czorlich, Yann

AU - Orell, Panu

AU - Kuusela, Jorma

AU - Falkegård, Morten

AU - Länsman, Maija

AU - Pulkkinen, Henni

AU - Primmer, Craig

AU - Niemelä, Eero

PY - 2019/1

Y1 - 2019/1

N2 - We used over 154000 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 one year at sea following 3-5 years in freshwater. Age at maturity has changed with an increase in two-sea-winter (2SW) salmon and previous spawners (PS), and a decline in 3SW fish. Smolt age distribution showed a decreasing proportion of age-3 smolts while that of age-5 increased. Fishing gear and fishing season times selected for fish differing in life-history strategies. Temporal variation in life histories reflects changes both in fisheries and the changing environment. There was an inverse relationship between years spent in freshwater and sea age. Biocomplexity was manifested by the multiple year classes (6-11) present in annual runs that increased with years, reflecting an increase both in PS and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generation overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect.

AB - We used over 154000 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 one year at sea following 3-5 years in freshwater. Age at maturity has changed with an increase in two-sea-winter (2SW) salmon and previous spawners (PS), and a decline in 3SW fish. Smolt age distribution showed a decreasing proportion of age-3 smolts while that of age-5 increased. Fishing gear and fishing season times selected for fish differing in life-history strategies. Temporal variation in life histories reflects changes both in fisheries and the changing environment. There was an inverse relationship between years spent in freshwater and sea age. Biocomplexity was manifested by the multiple year classes (6-11) present in annual runs that increased with years, reflecting an increase both in PS and sampling effort. The high number of cohorts spawning simultaneously each year indicates strong generation overlap, which has been suggested to maintain genetic diversity and thereby resilience via the portfolio effect.

KW - 1172 Environmental sciences

KW - 114 Physical sciences

KW - CLIMATE-CHANGE

KW - TEMPORAL VARIATION

KW - GENETIC-STRUCTURE

KW - MIRAMICHI RIVER

KW - NORTH-ATLANTIC

KW - BARENTS SEA

KW - MALE PARR

KW - SALAR

KW - FISH

KW - AGE

U2 - 10.1139/cjfas-2017-0343

DO - 10.1139/cjfas-2017-0343

M3 - Article

VL - 76

SP - 42

EP - 55

JO - Canadian Journal of Fisheries and Aquatic Sciences

JF - Canadian Journal of Fisheries and Aquatic Sciences

SN - 0706-652X

IS - 1

ER -