Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates
Populations of Atlantic salmon Salmo salar have experienced precipitous declines in abundance since the 1970s. This decline has been associated with reduced numbers of adult salmon returning to freshwater from their marine migration, i.e., their marine return rates (MRR). Thus, understanding the fac...
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Online Access: | https://archimer.ifremer.fr/doc/00734/84578/89651.pdf https://doi.org/10.1111/jfb.14946 https://archimer.ifremer.fr/doc/00734/84578/ |
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ftarchimer:oai:archimer.ifremer.fr:84578 2023-05-15T15:31:40+02:00 Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates Simmons, O.m. Britton, J.r. Gillingham, P.k. Nevoux, M. Riley, W.d. Rivot, E. Gregory, S.d. 2022-08 application/pdf https://archimer.ifremer.fr/doc/00734/84578/89651.pdf https://doi.org/10.1111/jfb.14946 https://archimer.ifremer.fr/doc/00734/84578/ eng eng Wiley https://archimer.ifremer.fr/doc/00734/84578/89651.pdf doi:10.1111/jfb.14946 https://archimer.ifremer.fr/doc/00734/84578/ info:eu-repo/semantics/openAccess restricted use Journal Of Fish Biology (0022-1112) (Wiley), 2022-08 , Vol. 101 , N. 2 , P. 378-388 anadromous salmonid body size sea bass state-space model survival temperature text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.1111/jfb.14946 2022-11-15T23:50:26Z Populations of Atlantic salmon Salmo salar have experienced precipitous declines in abundance since the 1970s. This decline has been associated with reduced numbers of adult salmon returning to freshwater from their marine migration, i.e., their marine return rates (MRR). Thus, understanding the factors that affect MRR is of crucial conservation importance. We used a state-space model with a 13-year time series of individually tagged salmon mark-recapture histories on the River Frome, southern England, to test the effect of smolt body length on their MRR. As well as smolt length, the model tested for the influence of environmental covariates that were representative of the conditions experienced by the smolts in the early stages of their seaward migration, i.e., from the lower river to the estuary exit. The model indicated that, even when accounting for environmental covariates, smolt body length was an important predictor of MRR. While larger smolts have a higher probability of returning to their natal river as adults than smaller smolts, and one-sea-winter salmon have a survival rate twice as high as multi-sea-winter salmon, the actual biological mechanisms underpinning this phenomenon remain uncertain. These results have important applications for salmon conservation, as efforts to bolster salmon populations in the freshwater environment should consider ways to improve smolt quality (i.e., body size) as well as smolt quantity. Article in Journal/Newspaper Atlantic salmon Salmo salar Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Journal of Fish Biology 101 2 378 388 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
anadromous salmonid body size sea bass state-space model survival temperature |
spellingShingle |
anadromous salmonid body size sea bass state-space model survival temperature Simmons, O.m. Britton, J.r. Gillingham, P.k. Nevoux, M. Riley, W.d. Rivot, E. Gregory, S.d. Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
topic_facet |
anadromous salmonid body size sea bass state-space model survival temperature |
description |
Populations of Atlantic salmon Salmo salar have experienced precipitous declines in abundance since the 1970s. This decline has been associated with reduced numbers of adult salmon returning to freshwater from their marine migration, i.e., their marine return rates (MRR). Thus, understanding the factors that affect MRR is of crucial conservation importance. We used a state-space model with a 13-year time series of individually tagged salmon mark-recapture histories on the River Frome, southern England, to test the effect of smolt body length on their MRR. As well as smolt length, the model tested for the influence of environmental covariates that were representative of the conditions experienced by the smolts in the early stages of their seaward migration, i.e., from the lower river to the estuary exit. The model indicated that, even when accounting for environmental covariates, smolt body length was an important predictor of MRR. While larger smolts have a higher probability of returning to their natal river as adults than smaller smolts, and one-sea-winter salmon have a survival rate twice as high as multi-sea-winter salmon, the actual biological mechanisms underpinning this phenomenon remain uncertain. These results have important applications for salmon conservation, as efforts to bolster salmon populations in the freshwater environment should consider ways to improve smolt quality (i.e., body size) as well as smolt quantity. |
format |
Article in Journal/Newspaper |
author |
Simmons, O.m. Britton, J.r. Gillingham, P.k. Nevoux, M. Riley, W.d. Rivot, E. Gregory, S.d. |
author_facet |
Simmons, O.m. Britton, J.r. Gillingham, P.k. Nevoux, M. Riley, W.d. Rivot, E. Gregory, S.d. |
author_sort |
Simmons, O.m. |
title |
Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
title_short |
Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
title_full |
Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
title_fullStr |
Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
title_full_unstemmed |
Predicting how environmental conditions and smolt body length when entering the marine environment impact individual Atlantic salmon Salmo salar adult return rates |
title_sort |
predicting how environmental conditions and smolt body length when entering the marine environment impact individual atlantic salmon salmo salar adult return rates |
publisher |
Wiley |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00734/84578/89651.pdf https://doi.org/10.1111/jfb.14946 https://archimer.ifremer.fr/doc/00734/84578/ |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal Of Fish Biology (0022-1112) (Wiley), 2022-08 , Vol. 101 , N. 2 , P. 378-388 |
op_relation |
https://archimer.ifremer.fr/doc/00734/84578/89651.pdf doi:10.1111/jfb.14946 https://archimer.ifremer.fr/doc/00734/84578/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/jfb.14946 |
container_title |
Journal of Fish Biology |
container_volume |
101 |
container_issue |
2 |
container_start_page |
378 |
op_container_end_page |
388 |
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1766362189650722816 |