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dc.contributor.authorStrøm, John Fredrik
dc.contributor.authorRikardsen, Audun Håvard
dc.contributor.authorCampana, Steven E.
dc.contributor.authorRighton, David
dc.contributor.authorCarr, Jonathan
dc.contributor.authorAarestrup, Kim
dc.contributor.authorStokesbury, Michael J.W.
dc.contributor.authorGargan, Patrick
dc.contributor.authorJavierre, Pablo Caballero
dc.contributor.authorThorstad, Eva Bonsak
dc.date.accessioned2019-07-15T11:17:03Z
dc.date.available2019-07-15T11:17:03Z
dc.date.issued2019-05-27
dc.description.abstractPredation and mortality are often difficult to estimate in the ocean, which hampers the management and conservation of marine fishes. We used data from pop-up satellite archival tags to investigate the ocean predation and mortality of adult Atlantic salmon (Salmo salar) released from 12 rivers flowing into the North Atlantic Ocean. Data from 156 tagged fish revealed 22 definite predation events (14%) and 38 undetermined mortalities (24%). Endothermic fish were the most common predators (n = 13), with most of these predation events occurring in the Gulf of St. Lawrence and from the Bay of Biscay to the Irish Shelf. Predation by marine mammals, most likely large deep-diving toothed whales (n = 5), and large ectothermic fish (n = 4) were less frequent. Both the estimated predation rates (Zp) and total mortality rates (ZM) where higher for Atlantic salmon from Canada, Ireland, and Spain (Zp = 0.60– 1.32 y−1, ZM = 1.73–3.08 y−1) than from Denmark and Norway (Zp = 0–0.13 y−1, ZM = 0.19–1.03 y−1). This geographical variation in ocean mortality correlates with ongoing population declines, which are more profound for southern populations, indicating that low ocean survival of adults may act as an additional stressor to already vulnerable populations.en_US
dc.description.sponsorshipAcknowledgements We thank Alta Laksefiskeri Interessentskap, Atlantic Salmon Conservation Foundation, Danish Rod and Net License Fund, Inland Fisheries Ireland, Miramichi Salmon Association, Research Council of Norway project 280308 SeaSalar, Tromsø Research Foundation, and Xunta de Galicia for supporting and funding this project. We also thank all staff, students, and volunteers who have contributed to the fieldwork, and Timothy F. Sheehan and Jaakko Erkinaro for insightful discussion on an earlier version of the manuscript.en_US
dc.descriptionPublished version, available at: <a href=https://doi.org/10.1038/s41598-019-44041-5>https://doi.org/10.1038/s41598-019-44041-5</a>en_US
dc.identifier.citationStrøm, J.F., Rikardsen, A.H., Campana, S.E., Righton, D., Carr, J., Aarestrup, K., Stokesbury, M. J.W., Gargan, P., Javierre, P.C., Thorstad, E.B. (2019) Ocean predation and mortality of adult Atlantic salmon. <i> Scientific Reports, 9, </i> (7890), 11 s. https://doi.org/10.1038/s41598-019-44041-5en_US
dc.identifier.issn2045-2322
dc.identifier.otherFRIDAID 1700409
dc.identifier.otherhttps://doi.org/10.1038/s41598-019-44041-5
dc.identifier.urihttps://hdl.handle.net/10037/15762
dc.language.isoengen_US
dc.publisherNatureResearchen_US
dc.relation.journalScientific Reports
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.titleOcean predation and mortality of adult Atlantic salmonen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US


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