Sea trout Salmo trutta in the subarctic: home-bound but large variation in migratory behaviour between and within populations.

Autor: Strøm JF; Institute of Marine Research, Tromsø, Norway., Jensen JLA; Akvaplan-niva AS, Alta, Norway., Nikolopoulos A; Institute of Marine Research, Tromsø, Norway., Nordli E; Faculty of Biosciences, Fisheries and Economics, UiT the Arctic University of Norway, Tromsø, Norway., Bjørn PA; Institute of Marine Research, Tromsø, Norway., Bøhn T; Institute of Marine Research, Tromsø, Norway.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2021 Oct; Vol. 99 (4), pp. 1280-1291. Date of Electronic Publication: 2021 Jul 14.
DOI: 10.1111/jfb.14832
Abstrakt: Anadromous brown trout (sea trout), Salmo trutta, is currently in decline throughout its range, largely due to anthropogenic stressors in freshwater and marine habitats. Acoustic telmetry was utilized to study the marine migration of sea trout post-smolts from three populations in a relatively pristine subarctic fjord system. While at sea, the sea trout spent a substantial part of their time close to their natal river, preferred near shore over pelagic habitats and were strongly surface oriented. Despite a fidelity towards local areas, the sea trout utilized various parts of the fjord system, with maximum dispersion >30 km and total migration distance >300 km. Almost half of the sea trout (44%) migrated between river outlets, indicating that a metapopulation approach may be appropriate when managing neighbouring sea trout populations at high latitudes. Furthermore, the different populations displayed different migratory behaviours in terms of distance migrated, dispersion from origin and the likelihood of leaving their home area. This variation in migratory behaviour is likely influenced by spatiotemporal differences in habitat quality between sites, indicating that local habitat variations may promote population-specific behavioural responses even in relatively confined fjord systems.
(© 2021 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles.)
Databáze: MEDLINE
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