Optimal timing of return migration in Atlantic salmon
Abstract In many populations of Atlantic salmon, individuals return to rivers months or even a year prior to spawning. This premature arrival in fresh water by far exceeds the time needed for upstream migrations to spawning areas. Leaving the ocean early means forgoing substantial growth and incurri...
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Online Access: | http://dx.doi.org/10.1111/faf.12816 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12816 |
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crwiley:10.1111/faf.12816 2024-06-02T08:03:23+00:00 Optimal timing of return migration in Atlantic salmon Foldvik, Anders Ulvan, Eva Marita Næsje, Tor Norges Forskningsråd 2024 http://dx.doi.org/10.1111/faf.12816 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12816 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Fish and Fisheries volume 25, issue 3, page 429-440 ISSN 1467-2960 1467-2979 journal-article 2024 crwiley https://doi.org/10.1111/faf.12816 2024-05-03T10:59:00Z Abstract In many populations of Atlantic salmon, individuals return to rivers months or even a year prior to spawning. This premature arrival in fresh water by far exceeds the time needed for upstream migrations to spawning areas. Leaving the ocean early means forgoing substantial growth and incurring high metabolic costs of fasting in freshwater. Differences in timing of return migration has been shown to have a genetic basis, and different sea age classes return to rivers at different times. Previously suggested explanations regarding the cause for this behaviour have included both environmental factors and life history trade‐offs, but these hypotheses have not been tested. Here, we combine data on marine growth and mortality of Atlantic salmon with the calculations of energetic expenditures of fasting in freshwater to explore how timing of river entry affects the probability of survival and energy recourses available for spawning. Our results show that to maximize the product of survival until spawning and energy available at spawning, multi sea winter fish in general must enter rivers earlier than one sea winter fish. And that for a large range of sea survival rates, the optimum river entry date for multi sea winter fish is as early as possible. This strongly suggests that the phenomena of premature arrival in Atlantic salmon is adaptive behaviour. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Fish and Fisheries 25 3 429 440 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract In many populations of Atlantic salmon, individuals return to rivers months or even a year prior to spawning. This premature arrival in fresh water by far exceeds the time needed for upstream migrations to spawning areas. Leaving the ocean early means forgoing substantial growth and incurring high metabolic costs of fasting in freshwater. Differences in timing of return migration has been shown to have a genetic basis, and different sea age classes return to rivers at different times. Previously suggested explanations regarding the cause for this behaviour have included both environmental factors and life history trade‐offs, but these hypotheses have not been tested. Here, we combine data on marine growth and mortality of Atlantic salmon with the calculations of energetic expenditures of fasting in freshwater to explore how timing of river entry affects the probability of survival and energy recourses available for spawning. Our results show that to maximize the product of survival until spawning and energy available at spawning, multi sea winter fish in general must enter rivers earlier than one sea winter fish. And that for a large range of sea survival rates, the optimum river entry date for multi sea winter fish is as early as possible. This strongly suggests that the phenomena of premature arrival in Atlantic salmon is adaptive behaviour. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Foldvik, Anders Ulvan, Eva Marita Næsje, Tor |
spellingShingle |
Foldvik, Anders Ulvan, Eva Marita Næsje, Tor Optimal timing of return migration in Atlantic salmon |
author_facet |
Foldvik, Anders Ulvan, Eva Marita Næsje, Tor |
author_sort |
Foldvik, Anders |
title |
Optimal timing of return migration in Atlantic salmon |
title_short |
Optimal timing of return migration in Atlantic salmon |
title_full |
Optimal timing of return migration in Atlantic salmon |
title_fullStr |
Optimal timing of return migration in Atlantic salmon |
title_full_unstemmed |
Optimal timing of return migration in Atlantic salmon |
title_sort |
optimal timing of return migration in atlantic salmon |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/faf.12816 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12816 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Fish and Fisheries volume 25, issue 3, page 429-440 ISSN 1467-2960 1467-2979 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/faf.12816 |
container_title |
Fish and Fisheries |
container_volume |
25 |
container_issue |
3 |
container_start_page |
429 |
op_container_end_page |
440 |
_version_ |
1800747900445130752 |