Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids
Abstract Juvenile salmonids often experience high mortality rates during migration and bird predation is a common source of mortality. Research suggests that hatchery‐reared salmonids are more prone to predation than wild salmonids, and that Atlantic salmon ( Salmo salar ) experience lower predation...
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crwiley:10.1002/ecs2.4724 2024-06-02T08:03:34+00:00 Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids Säterberg, Torbjörn Jacobson, Philip Ovegård, Maria Rask, Jörgen Östergren, Johan Jepsen, Niels Florin, Ann‐Britt 2023 http://dx.doi.org/10.1002/ecs2.4724 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.4724 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecosphere volume 14, issue 12 ISSN 2150-8925 2150-8925 journal-article 2023 crwiley https://doi.org/10.1002/ecs2.4724 2024-05-03T11:29:39Z Abstract Juvenile salmonids often experience high mortality rates during migration and bird predation is a common source of mortality. Research suggests that hatchery‐reared salmonids are more prone to predation than wild salmonids, and that Atlantic salmon ( Salmo salar ) experience lower predation than Sea trout ( Salmo trutta ), yet telemetry studies have displayed equivocal results. Here, using a large data set on passive integrated transponder (PIT) tagged hatchery‐reared and wild juveniles of Atlantic salmon and Sea trout (25,769 individuals) we investigate predation probability by piscivorous birds (mainly Great Cormorants Phalarocorax carbo ) on salmonids originating from River Dalälven in Sweden. Bird colonies and roosting sites were scanned annually (2019–2021), and the temporal dynamics of bird predation on salmonids released in 2017–2021 was assessed. Hatchery‐reared trout was clearly most susceptible to cormorant predation (0.31, 90% credibility interval [CRI] = 0.14–0.53), followed by wild trout (0.19, 90% CRI = 0.08–0.37), hatchery‐reared salmon (0.13, 90% CRI = 0.07–0.23), and wild salmon (0.08, 90% CRI = 0.04–0.14), in subsequent order. This order in predation probability was consistent across all studied tag‐ and release‐years, suggesting that the opportunistic foraging of cormorants affects the overall survival of juvenile salmonids, but that the inherent predation risk between different salmonid types differs systematically. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Ecosphere 14 12 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Juvenile salmonids often experience high mortality rates during migration and bird predation is a common source of mortality. Research suggests that hatchery‐reared salmonids are more prone to predation than wild salmonids, and that Atlantic salmon ( Salmo salar ) experience lower predation than Sea trout ( Salmo trutta ), yet telemetry studies have displayed equivocal results. Here, using a large data set on passive integrated transponder (PIT) tagged hatchery‐reared and wild juveniles of Atlantic salmon and Sea trout (25,769 individuals) we investigate predation probability by piscivorous birds (mainly Great Cormorants Phalarocorax carbo ) on salmonids originating from River Dalälven in Sweden. Bird colonies and roosting sites were scanned annually (2019–2021), and the temporal dynamics of bird predation on salmonids released in 2017–2021 was assessed. Hatchery‐reared trout was clearly most susceptible to cormorant predation (0.31, 90% credibility interval [CRI] = 0.14–0.53), followed by wild trout (0.19, 90% CRI = 0.08–0.37), hatchery‐reared salmon (0.13, 90% CRI = 0.07–0.23), and wild salmon (0.08, 90% CRI = 0.04–0.14), in subsequent order. This order in predation probability was consistent across all studied tag‐ and release‐years, suggesting that the opportunistic foraging of cormorants affects the overall survival of juvenile salmonids, but that the inherent predation risk between different salmonid types differs systematically. |
format |
Article in Journal/Newspaper |
author |
Säterberg, Torbjörn Jacobson, Philip Ovegård, Maria Rask, Jörgen Östergren, Johan Jepsen, Niels Florin, Ann‐Britt |
spellingShingle |
Säterberg, Torbjörn Jacobson, Philip Ovegård, Maria Rask, Jörgen Östergren, Johan Jepsen, Niels Florin, Ann‐Britt Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
author_facet |
Säterberg, Torbjörn Jacobson, Philip Ovegård, Maria Rask, Jörgen Östergren, Johan Jepsen, Niels Florin, Ann‐Britt |
author_sort |
Säterberg, Torbjörn |
title |
Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
title_short |
Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
title_full |
Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
title_fullStr |
Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
title_full_unstemmed |
Species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
title_sort |
species‐ and origin‐specific susceptibility to bird predation among juvenile salmonids |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/ecs2.4724 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.4724 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Ecosphere volume 14, issue 12 ISSN 2150-8925 2150-8925 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ecs2.4724 |
container_title |
Ecosphere |
container_volume |
14 |
container_issue |
12 |
_version_ |
1800748122988609536 |