Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios
Given the limited information on prey use during the marine residency period for Atlantic salmon, scales were collected from salmon at return to the River Namsen (Norway) for spawning after 1 year at sea, and scale material from the first and second summer marine feeding periods was analysed using s...
Published in: | Ecology and Evolution |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/3103557 https://doi.org/10.1002/ece3.10656 |
id |
ftninstnf:oai:brage.nina.no:11250/3103557 |
---|---|
record_format |
openpolar |
spelling |
ftninstnf:oai:brage.nina.no:11250/3103557 2023-12-17T10:27:24+01:00 Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios Power, Michael Thorstad, Eva Bonsak Forseth, Torbjørn Fiske, Peder river Namsen, Norway 2023 application/pdf https://hdl.handle.net/11250/3103557 https://doi.org/10.1002/ece3.10656 eng eng Norges forskningsråd: 160022 Norges forskningsråd: 280308 Andre: Natural Sciences and Engineering Research Council of Canada urn:issn:2045-7758 https://hdl.handle.net/11250/3103557 https://doi.org/10.1002/ece3.10656 cristin:2191524 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2023 The Authors 13 Ecology and Evolution 1 e10656 diet energetics marine migration Salmo salar Life history ecology feeding growth VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Peer reviewed Journal article 2023 ftninstnf https://doi.org/10.1002/ece3.10656 2023-11-22T23:49:28Z Given the limited information on prey use during the marine residency period for Atlantic salmon, scales were collected from salmon at return to the River Namsen (Norway) for spawning after 1 year at sea, and scale material from the first and second summer marine feeding periods was analysed using stable isotope methods to understand dynamics of their trophic ecology. As the salmon increased in size from the first to second summer, they reduced their feeding niche and specialised more (narrowed the δ13C range) and increased their dependency on higher tropic level (δ15N) prey, likely fish. Changes in δ13C indicated a consistent pattern of movement towards the north and west between summer feeding periods. Hence, salmon during their first year at sea may have a migration route roughly resembling that of previous spawners, as inferred from earlier tagging studies. Feeding conditions and nutrient composition during the last summer at sea, i.e. in the months before returning to the river for spawning, impacted final body size and within-season timing of return. Fish undergoing the largest trophic niche shift (δ13C and δ15N combined) between summer feeding periods, returned earliest. The earliest returning fish had the fastest specific growth rates at sea. Hence, salmon encountering abundant high-quality fish food during the marine migration, particularly during the last months, may reach a size and energetic state whereby it is better to return early to a safer environment in freshwater than risk being eaten by a big predator at sea. Both trophic status (δ15N), resource use (δ13C) and growth rates were significantly correlated between feeding periods. Nutrient composition during the first summer at sea did not impact the fish body length after the following winter, but growth conditions during the first summer evidenced carry-over effects from the first to the second summer of feeding. diet, energetics, feeding, growth, marine migration, Salmo salar Life history ecology Temporal shifts in the marine feeding of ... Article in Journal/Newspaper Atlantic salmon Salmo salar Norwegian Institute for Nature Research: Brage NINA Norway Ecology and Evolution 13 11 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
diet energetics marine migration Salmo salar Life history ecology feeding growth VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
spellingShingle |
diet energetics marine migration Salmo salar Life history ecology feeding growth VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Power, Michael Thorstad, Eva Bonsak Forseth, Torbjørn Fiske, Peder Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
topic_facet |
diet energetics marine migration Salmo salar Life history ecology feeding growth VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
description |
Given the limited information on prey use during the marine residency period for Atlantic salmon, scales were collected from salmon at return to the River Namsen (Norway) for spawning after 1 year at sea, and scale material from the first and second summer marine feeding periods was analysed using stable isotope methods to understand dynamics of their trophic ecology. As the salmon increased in size from the first to second summer, they reduced their feeding niche and specialised more (narrowed the δ13C range) and increased their dependency on higher tropic level (δ15N) prey, likely fish. Changes in δ13C indicated a consistent pattern of movement towards the north and west between summer feeding periods. Hence, salmon during their first year at sea may have a migration route roughly resembling that of previous spawners, as inferred from earlier tagging studies. Feeding conditions and nutrient composition during the last summer at sea, i.e. in the months before returning to the river for spawning, impacted final body size and within-season timing of return. Fish undergoing the largest trophic niche shift (δ13C and δ15N combined) between summer feeding periods, returned earliest. The earliest returning fish had the fastest specific growth rates at sea. Hence, salmon encountering abundant high-quality fish food during the marine migration, particularly during the last months, may reach a size and energetic state whereby it is better to return early to a safer environment in freshwater than risk being eaten by a big predator at sea. Both trophic status (δ15N), resource use (δ13C) and growth rates were significantly correlated between feeding periods. Nutrient composition during the first summer at sea did not impact the fish body length after the following winter, but growth conditions during the first summer evidenced carry-over effects from the first to the second summer of feeding. diet, energetics, feeding, growth, marine migration, Salmo salar Life history ecology Temporal shifts in the marine feeding of ... |
format |
Article in Journal/Newspaper |
author |
Power, Michael Thorstad, Eva Bonsak Forseth, Torbjørn Fiske, Peder |
author_facet |
Power, Michael Thorstad, Eva Bonsak Forseth, Torbjørn Fiske, Peder |
author_sort |
Power, Michael |
title |
Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
title_short |
Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
title_full |
Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
title_fullStr |
Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
title_full_unstemmed |
Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
title_sort |
temporal shifts in the marine feeding of individual atlantic salmon inferred from scale isotope ratios |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3103557 https://doi.org/10.1002/ece3.10656 |
op_coverage |
river Namsen, Norway |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
13 Ecology and Evolution 1 e10656 |
op_relation |
Norges forskningsråd: 160022 Norges forskningsråd: 280308 Andre: Natural Sciences and Engineering Research Council of Canada urn:issn:2045-7758 https://hdl.handle.net/11250/3103557 https://doi.org/10.1002/ece3.10656 cristin:2191524 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2023 The Authors |
op_doi |
https://doi.org/10.1002/ece3.10656 |
container_title |
Ecology and Evolution |
container_volume |
13 |
container_issue |
11 |
_version_ |
1785579252446396416 |