Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon
Long-term population viability of Bay of Fundy Atlantic salmon (Salmo salar) is threatened by high levels of marine mortality during migration. Pop-up satellite archival tags on repeat spawners provide direct evidence of extensive natural mortality of migrating salmon in coastal zones attributed to...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2014
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Online Access: | http://dx.doi.org/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2013-0458 |
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crcansciencepubl:10.1139/cjfas-2013-0458 2024-09-09T19:30:24+00:00 Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon Lacroix, Gilles L. Fleming, Ian 2014 http://dx.doi.org/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2013-0458 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 71, issue 3, page 343-350 ISSN 0706-652X 1205-7533 journal-article 2014 crcansciencepubl https://doi.org/10.1139/cjfas-2013-0458 2024-08-29T04:08:49Z Long-term population viability of Bay of Fundy Atlantic salmon (Salmo salar) is threatened by high levels of marine mortality during migration. Pop-up satellite archival tags on repeat spawners provide direct evidence of extensive natural mortality of migrating salmon in coastal zones attributed to predation by large pelagic fish and no evidence of fishing mortality. Ingested tags show that salmon with a coastal migration are eaten by porbeagle shark (Lamna nasus) inside the Bay of Fundy, whereas distant migrants are consumed by Atlantic bluefin tuna (Thunnus thynnus) and other apex predators along the Scotian Shelf. Mortality is clustered in a few zones because of similar predator–prey habitat preferences and overlapping migration paths. The extent of predation in salmon populations with different migration strategies can account for observed decline rates in neighbouring populations with different life histories. The impact on endangered salmon populations that rely on multiple repeat spawners for population stability may be sufficient to hamper ongoing recovery efforts. Article in Journal/Newspaper Atlantic salmon Lamna nasus Porbeagle Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 71 3 343 350 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Long-term population viability of Bay of Fundy Atlantic salmon (Salmo salar) is threatened by high levels of marine mortality during migration. Pop-up satellite archival tags on repeat spawners provide direct evidence of extensive natural mortality of migrating salmon in coastal zones attributed to predation by large pelagic fish and no evidence of fishing mortality. Ingested tags show that salmon with a coastal migration are eaten by porbeagle shark (Lamna nasus) inside the Bay of Fundy, whereas distant migrants are consumed by Atlantic bluefin tuna (Thunnus thynnus) and other apex predators along the Scotian Shelf. Mortality is clustered in a few zones because of similar predator–prey habitat preferences and overlapping migration paths. The extent of predation in salmon populations with different migration strategies can account for observed decline rates in neighbouring populations with different life histories. The impact on endangered salmon populations that rely on multiple repeat spawners for population stability may be sufficient to hamper ongoing recovery efforts. |
author2 |
Fleming, Ian |
format |
Article in Journal/Newspaper |
author |
Lacroix, Gilles L. |
spellingShingle |
Lacroix, Gilles L. Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
author_facet |
Lacroix, Gilles L. |
author_sort |
Lacroix, Gilles L. |
title |
Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
title_short |
Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
title_full |
Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
title_fullStr |
Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
title_full_unstemmed |
Large pelagic predators could jeopardize the recovery of endangered Atlantic salmon |
title_sort |
large pelagic predators could jeopardize the recovery of endangered atlantic salmon |
publisher |
Canadian Science Publishing |
publishDate |
2014 |
url |
http://dx.doi.org/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2013-0458 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2013-0458 |
genre |
Atlantic salmon Lamna nasus Porbeagle Salmo salar |
genre_facet |
Atlantic salmon Lamna nasus Porbeagle Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 71, issue 3, page 343-350 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2013-0458 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
71 |
container_issue |
3 |
container_start_page |
343 |
op_container_end_page |
350 |
_version_ |
1809899383729160192 |