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- Title
Predation of Atlantic salmon across ontogenetic stages and impacts on populations.
- Authors
Falkegård, Morten; Lennox, Robert J.; Thorstad, Eva B.; Einum, Sigurd; Fiske, Peder; Garmo, Øyvind A.; Garseth, Åse H.; Skoglund, Helge; Solberg, Monica F.; Utne, Kjell R.; Vollset, Knut W.; Vøllestad, Leif Asbjørn; Wennevik, Vidar; Forseth, Torbjørn
- Abstract
Managers and stakeholders increasingly ask whether predation is a driving force behind the poor status of many species, and whether predator control is likely to be a successful management action to intervene. We review existing literature on Atlantic salmon Salmo salar predation and predator control, as well as general ecological theory on the role of predation in the life cycle of this iconic fish. Many bird, mammal, and fish predators target salmon at different life stages. In healthy salmon populations, predation is likely compensated for by reduced intraspecific competition during the freshwater stage. There is little evidence that predation alone has been an underlying mechanism for driving salmon populations below conservation limits. However, depending on the predator's response to salmon abundance, predation may keep decimated populations from recovering, even when the actual causes of decline have been removed. Under such a scenario, predation control may contribute to recovery, but there are no strong examples that clearly demonstrate the efficacy of managing predators to recover threatened salmon populations, challenging further applications.
- Subjects
PREDATION; PREDATOR management; LIFE cycles (Biology); COMPETITION (Biology); ATLANTIC salmon; SALMON
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2023, Vol 80, Issue 10, p1696
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2023-0029