Trends in marine survival of Atlantic salmon populations in eastern Canada
Declines in wild Atlantic salmon (Salmo salar) abundance throughout the north Atlantic are primarily attributed to decreases in survival at sea. However, comparing trends in marine survival among populations is challenging as data on both migrating smolts and returning adults are sparse and models a...
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Oxford University Press
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Online Access: | https://hdl.handle.net/11250/2836059 https://doi.org/10.1093/icesjms/fsab118 |
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ftagderuniv:oai:uia.brage.unit.no:11250/2836059 2023-05-15T15:31:18+02:00 Trends in marine survival of Atlantic salmon populations in eastern Canada Pardo, Sebastián A Bolstad, Geir Hysing Dempson, J. Brian April, Julien Jones, Ross A Raab, Dustin Hutchings, Jeffrey 2021 application/pdf https://hdl.handle.net/11250/2836059 https://doi.org/10.1093/icesjms/fsab118 eng eng Oxford University Press Norges forskningsråd: 275862 Norges forskningsråd: 280308 Pardo, S. A., Bolstad, G. H., Dempson, J. B., April, J., Jones, R. A., Raab, D. & Hutchings, J. (2021). ICES Journal of Marine Science, 78 (7), 2460-2473. urn:issn:1095-9289 https://hdl.handle.net/11250/2836059 https://doi.org/10.1093/icesjms/fsab118 cristin:1933573 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2021 The Author(s) CC-BY 2460-2473 78 ICES Journal of Marine Science 7 Peer reviewed Journal article 2021 ftagderuniv https://doi.org/10.1093/icesjms/fsab118 2022-12-11T06:51:28Z Declines in wild Atlantic salmon (Salmo salar) abundance throughout the north Atlantic are primarily attributed to decreases in survival at sea. However, comparing trends in marine survival among populations is challenging as data on both migrating smolts and returning adults are sparse and models are difficult to parameterize due to their varied life histories. We fit a hierarchical Bayesian maturity schedule model to data from seven populations in eastern Canada to estimate numbers of out-migrating smolts, survival in the first and second year at sea, and the proportion returning after 1 year. Trends in survival at sea were not consistent among populations; we observe positive, negative, and no correlations in these, suggesting that large-scale patterns of changes in marine survival are not necessarily representative for individual populations. Variation in return abundances was mostly explained by marine survival in the first winter at sea in all but one population. However, variation in the other components were not negligible and their relative importance differed among populations. If salmon populations do not respond in a uniform manner to changing environmental conditions throughout their range, future research initiatives should explore why. publishedVersion Article in Journal/Newspaper Atlantic salmon North Atlantic Salmo salar Unvieristy of Agder: AURA (Brage) Canada ICES Journal of Marine Science 78 7 2460 2473 |
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Unvieristy of Agder: AURA (Brage) |
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English |
description |
Declines in wild Atlantic salmon (Salmo salar) abundance throughout the north Atlantic are primarily attributed to decreases in survival at sea. However, comparing trends in marine survival among populations is challenging as data on both migrating smolts and returning adults are sparse and models are difficult to parameterize due to their varied life histories. We fit a hierarchical Bayesian maturity schedule model to data from seven populations in eastern Canada to estimate numbers of out-migrating smolts, survival in the first and second year at sea, and the proportion returning after 1 year. Trends in survival at sea were not consistent among populations; we observe positive, negative, and no correlations in these, suggesting that large-scale patterns of changes in marine survival are not necessarily representative for individual populations. Variation in return abundances was mostly explained by marine survival in the first winter at sea in all but one population. However, variation in the other components were not negligible and their relative importance differed among populations. If salmon populations do not respond in a uniform manner to changing environmental conditions throughout their range, future research initiatives should explore why. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Pardo, Sebastián A Bolstad, Geir Hysing Dempson, J. Brian April, Julien Jones, Ross A Raab, Dustin Hutchings, Jeffrey |
spellingShingle |
Pardo, Sebastián A Bolstad, Geir Hysing Dempson, J. Brian April, Julien Jones, Ross A Raab, Dustin Hutchings, Jeffrey Trends in marine survival of Atlantic salmon populations in eastern Canada |
author_facet |
Pardo, Sebastián A Bolstad, Geir Hysing Dempson, J. Brian April, Julien Jones, Ross A Raab, Dustin Hutchings, Jeffrey |
author_sort |
Pardo, Sebastián A |
title |
Trends in marine survival of Atlantic salmon populations in eastern Canada |
title_short |
Trends in marine survival of Atlantic salmon populations in eastern Canada |
title_full |
Trends in marine survival of Atlantic salmon populations in eastern Canada |
title_fullStr |
Trends in marine survival of Atlantic salmon populations in eastern Canada |
title_full_unstemmed |
Trends in marine survival of Atlantic salmon populations in eastern Canada |
title_sort |
trends in marine survival of atlantic salmon populations in eastern canada |
publisher |
Oxford University Press |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2836059 https://doi.org/10.1093/icesjms/fsab118 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Atlantic salmon North Atlantic Salmo salar |
genre_facet |
Atlantic salmon North Atlantic Salmo salar |
op_source |
2460-2473 78 ICES Journal of Marine Science 7 |
op_relation |
Norges forskningsråd: 275862 Norges forskningsråd: 280308 Pardo, S. A., Bolstad, G. H., Dempson, J. B., April, J., Jones, R. A., Raab, D. & Hutchings, J. (2021). ICES Journal of Marine Science, 78 (7), 2460-2473. urn:issn:1095-9289 https://hdl.handle.net/11250/2836059 https://doi.org/10.1093/icesjms/fsab118 cristin:1933573 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2021 The Author(s) |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/icesjms/fsab118 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
7 |
container_start_page |
2460 |
op_container_end_page |
2473 |
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1766361790044700672 |