Atlantic salmon survival at sea: temporal changes that lack regional synchrony
Spatial and temporal synchrony in abundance or survival trends can be indicative of whether populations are affected by common environmental drivers. In Atlantic salmon ( Salmo salar), return rates to natal rivers have generally been assumed to be affected primarily by shared oceanic conditions, lea...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0302 |
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crcansciencepubl:10.1139/cjfas-2021-0302 2024-06-23T07:51:17+00:00 Atlantic salmon survival at sea: temporal changes that lack regional synchrony Tirronen, Maria Hutchings, Jeffrey A. Pardo, Sebastián A. Kuparinen, Anna 2022 http://dx.doi.org/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0302 en eng Canadian Science Publishing https://creativecommons.org/licenses/by/4.0/deed.en_GB Canadian Journal of Fisheries and Aquatic Sciences volume 79, issue 10, page 1697-1711 ISSN 0706-652X 1205-7533 journal-article 2022 crcansciencepubl https://doi.org/10.1139/cjfas-2021-0302 2024-06-06T04:11:15Z Spatial and temporal synchrony in abundance or survival trends can be indicative of whether populations are affected by common environmental drivers. In Atlantic salmon ( Salmo salar), return rates to natal rivers have generally been assumed to be affected primarily by shared oceanic conditions, leading to spatially synchronous trends in mortality. Here, we investigated the existence of parallel trends in salmon sea survival, using data on migrating smolts and returning adults from seven Canadian populations presumed to share feeding grounds. We analysed sea survival, using a Bayesian change-point model capable of detecting nonstationarity in time series data. Our results indicate that while salmon have experienced broadly comparable patterns in survival, finer-scale temporal shifts are not synchronous among populations. Our findings are not consistent with the hypothesis that salmon populations consistently share the same mortality-related stressors in the marine environment. Although populations may have shared greater synchrony in survival patterns in the past, this synchrony may be breaking down. It may be prudent to direct greater attention to smaller-scale regional and population-level correlates of survival. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Spatial and temporal synchrony in abundance or survival trends can be indicative of whether populations are affected by common environmental drivers. In Atlantic salmon ( Salmo salar), return rates to natal rivers have generally been assumed to be affected primarily by shared oceanic conditions, leading to spatially synchronous trends in mortality. Here, we investigated the existence of parallel trends in salmon sea survival, using data on migrating smolts and returning adults from seven Canadian populations presumed to share feeding grounds. We analysed sea survival, using a Bayesian change-point model capable of detecting nonstationarity in time series data. Our results indicate that while salmon have experienced broadly comparable patterns in survival, finer-scale temporal shifts are not synchronous among populations. Our findings are not consistent with the hypothesis that salmon populations consistently share the same mortality-related stressors in the marine environment. Although populations may have shared greater synchrony in survival patterns in the past, this synchrony may be breaking down. It may be prudent to direct greater attention to smaller-scale regional and population-level correlates of survival. |
format |
Article in Journal/Newspaper |
author |
Tirronen, Maria Hutchings, Jeffrey A. Pardo, Sebastián A. Kuparinen, Anna |
spellingShingle |
Tirronen, Maria Hutchings, Jeffrey A. Pardo, Sebastián A. Kuparinen, Anna Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
author_facet |
Tirronen, Maria Hutchings, Jeffrey A. Pardo, Sebastián A. Kuparinen, Anna |
author_sort |
Tirronen, Maria |
title |
Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
title_short |
Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
title_full |
Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
title_fullStr |
Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
title_full_unstemmed |
Atlantic salmon survival at sea: temporal changes that lack regional synchrony |
title_sort |
atlantic salmon survival at sea: temporal changes that lack regional synchrony |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0302 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0302 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 79, issue 10, page 1697-1711 ISSN 0706-652X 1205-7533 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.en_GB |
op_doi |
https://doi.org/10.1139/cjfas-2021-0302 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
_version_ |
1802642331852079104 |