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...
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ftpubmed:oai:pubmedcentral.nih.gov:10618632 2023-12-03T10:19:36+01:00 Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios Power, Michael Thorstad, Eva B. Forseth, Torbjørn Fiske, Peder 2023-10-31 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10618632/ https://doi.org/10.1002/ece3.10656 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10618632/ http://dx.doi.org/10.1002/ece3.10656 © 2023 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Ecol Evol Research Articles Text 2023 ftpubmed https://doi.org/10.1002/ece3.10656 2023-11-05T02:11:55Z 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 δ(13)C range) and increased their dependency on higher tropic level (δ(15)N) prey, likely fish. Changes in δ(13)C 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 (δ(13)C and δ(15)N 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 (δ(15)N), resource use (δ(13)C) 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. Text Atlantic salmon PubMed Central (PMC) Norway Ecology and Evolution 13 11 |
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Research Articles Power, Michael Thorstad, Eva B. Forseth, Torbjørn Fiske, Peder Temporal shifts in the marine feeding of individual Atlantic salmon inferred from scale isotope ratios |
topic_facet |
Research Articles |
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 δ(13)C range) and increased their dependency on higher tropic level (δ(15)N) prey, likely fish. Changes in δ(13)C 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 (δ(13)C and δ(15)N 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 (δ(15)N), resource use (δ(13)C) 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. |
format |
Text |
author |
Power, Michael Thorstad, Eva B. Forseth, Torbjørn Fiske, Peder |
author_facet |
Power, Michael Thorstad, Eva B. 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 |
publisher |
John Wiley and Sons Inc. |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10618632/ https://doi.org/10.1002/ece3.10656 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Ecol Evol |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10618632/ http://dx.doi.org/10.1002/ece3.10656 |
op_rights |
© 2023 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1002/ece3.10656 |
container_title |
Ecology and Evolution |
container_volume |
13 |
container_issue |
11 |
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1784266948152918016 |