Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean
Annual mean total length (LT) of wild one-sea-winter (1SW) Atlantic salmon Salmo salar of the Norwegian River Imsa decreased from 63 to 54 cm with a corresponding decrease in condition factor (K) for cohorts migrating to sea from 1976 to 2010. The reduction in LT is associated with a 40% decline in...
Published in: | Journal of Fish Biology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2477973 https://doi.org/10.1111/jfb.12854 |
id |
ftninstnf:oai:brage.nina.no:11250/2477973 |
---|---|
record_format |
openpolar |
spelling |
ftninstnf:oai:brage.nina.no:11250/2477973 2023-05-15T15:32:55+02:00 Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean Jonsson, Bror Jonsson, Nina Albretsen, Jon 2016 application/pdf http://hdl.handle.net/11250/2477973 https://doi.org/10.1111/jfb.12854 eng eng Norges forskningsråd: 225014 Journal of Fish Biology. 2016, 88 (2), 618-637. urn:issn:0022-1112 http://hdl.handle.net/11250/2477973 https://doi.org/10.1111/jfb.12854 cristin:1306298 618-637 88 Journal of Fish Biology 2 Tidsrekker Time series Vekst Growth Temperatur Temperature Climate change Klimaendringer VDP::Marinbiologi: 497 VDP::Marine biology: 497 Journal article Peer reviewed 2016 ftninstnf https://doi.org/10.1111/jfb.12854 2021-12-23T07:17:15Z Annual mean total length (LT) of wild one-sea-winter (1SW) Atlantic salmon Salmo salar of the Norwegian River Imsa decreased from 63 to 54 cm with a corresponding decrease in condition factor (K) for cohorts migrating to sea from 1976 to 2010. The reduction in LT is associated with a 40% decline in mean individual mass, from 2 to 1⋅2 kg. Hatchery fish reared from parental fish of the same population exhibited similar changes from 1981 onwards. The decrease in LT correlated negatively with near-surface temperatures in the eastern Norwegian Sea, thought to be the main feeding area of the present stock. Furthermore, S. salar exhibited significant variations in the proportion of cohorts attaining maturity after only one winter in the ocean. The proportion of S. salar spawning as 1SW fish was lower both in the 1970s and after 2000 than in the 1980s and 1990s associated with a gradual decline in post-smolt growth and smaller amounts of reserve energy in the fish. In wild S. salar, there was a positive association between post-smolt growth and the sea survival back to the River Imsa for spawning. In addition, among smolt year-classes, there were significant positive correlations between wild and hatchery S. salar in LT, K and age at maturity. The present changes may be caused by ecosystem changes following the collapse and rebuilding of the pelagic fish abundance in the North Atlantic Ocean, a gradual decrease in zooplankton abundance and climate change with increasing surface temperature in the Norwegian Sea. Thus, the observed variation in the life-history traits of S. salar appears primarily associated with major changes in the pelagic food web in the ocean. climate change; condition factor; growth; sea survival; temperature; time series. © 2016 The Fisheries Society of the British Isles acceptedVersion Article in Journal/Newspaper Atlantic salmon North Atlantic Norwegian Sea Salmo salar Norwegian Institute for Nature Research: Brage NINA Norwegian Sea Journal of Fish Biology 88 2 618 637 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Tidsrekker Time series Vekst Growth Temperatur Temperature Climate change Klimaendringer VDP::Marinbiologi: 497 VDP::Marine biology: 497 |
spellingShingle |
Tidsrekker Time series Vekst Growth Temperatur Temperature Climate change Klimaendringer VDP::Marinbiologi: 497 VDP::Marine biology: 497 Jonsson, Bror Jonsson, Nina Albretsen, Jon Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
topic_facet |
Tidsrekker Time series Vekst Growth Temperatur Temperature Climate change Klimaendringer VDP::Marinbiologi: 497 VDP::Marine biology: 497 |
description |
Annual mean total length (LT) of wild one-sea-winter (1SW) Atlantic salmon Salmo salar of the Norwegian River Imsa decreased from 63 to 54 cm with a corresponding decrease in condition factor (K) for cohorts migrating to sea from 1976 to 2010. The reduction in LT is associated with a 40% decline in mean individual mass, from 2 to 1⋅2 kg. Hatchery fish reared from parental fish of the same population exhibited similar changes from 1981 onwards. The decrease in LT correlated negatively with near-surface temperatures in the eastern Norwegian Sea, thought to be the main feeding area of the present stock. Furthermore, S. salar exhibited significant variations in the proportion of cohorts attaining maturity after only one winter in the ocean. The proportion of S. salar spawning as 1SW fish was lower both in the 1970s and after 2000 than in the 1980s and 1990s associated with a gradual decline in post-smolt growth and smaller amounts of reserve energy in the fish. In wild S. salar, there was a positive association between post-smolt growth and the sea survival back to the River Imsa for spawning. In addition, among smolt year-classes, there were significant positive correlations between wild and hatchery S. salar in LT, K and age at maturity. The present changes may be caused by ecosystem changes following the collapse and rebuilding of the pelagic fish abundance in the North Atlantic Ocean, a gradual decrease in zooplankton abundance and climate change with increasing surface temperature in the Norwegian Sea. Thus, the observed variation in the life-history traits of S. salar appears primarily associated with major changes in the pelagic food web in the ocean. climate change; condition factor; growth; sea survival; temperature; time series. © 2016 The Fisheries Society of the British Isles acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Jonsson, Bror Jonsson, Nina Albretsen, Jon |
author_facet |
Jonsson, Bror Jonsson, Nina Albretsen, Jon |
author_sort |
Jonsson, Bror |
title |
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
title_short |
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
title_full |
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
title_fullStr |
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
title_full_unstemmed |
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean |
title_sort |
environmental change influences the life history of salmon salmo salar in the north atlantic ocean |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2477973 https://doi.org/10.1111/jfb.12854 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Atlantic salmon North Atlantic Norwegian Sea Salmo salar |
genre_facet |
Atlantic salmon North Atlantic Norwegian Sea Salmo salar |
op_source |
618-637 88 Journal of Fish Biology 2 |
op_relation |
Norges forskningsråd: 225014 Journal of Fish Biology. 2016, 88 (2), 618-637. urn:issn:0022-1112 http://hdl.handle.net/11250/2477973 https://doi.org/10.1111/jfb.12854 cristin:1306298 |
op_doi |
https://doi.org/10.1111/jfb.12854 |
container_title |
Journal of Fish Biology |
container_volume |
88 |
container_issue |
2 |
container_start_page |
618 |
op_container_end_page |
637 |
_version_ |
1766363401985982464 |