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dc.contributor.authorHaraldstad, Tormod
dc.contributor.authorKroglund, Frode
dc.contributor.authorKristensen, Torstein
dc.contributor.authorJonsson, Bror
dc.contributor.authorHaugen, Thrond O
dc.date.accessioned2018-10-05T07:40:18Z
dc.date.available2018-10-05T07:40:18Z
dc.date.created2016-08-15T10:33:06Z
dc.date.issued2017
dc.identifier.citationEcology of Freshwater Fish. 2017, 26 (4), 541-551.nb_NO
dc.identifier.issn0906-6691
dc.identifier.urihttp://hdl.handle.net/11250/2566564
dc.description.abstractThe timing of smolt migration is a key phenological trait with profound implications for individual survival during both river descent and the subsequent sea sojourn of anadromous fish. We studied relationships between the time of smolt migration, water temperature and light intensity for Atlantic salmon (Salmo salar) and sea trout (Salmo trutta). During 2006–2012, migrating smolts descending the southern Norway River Storelva were caught in a rotary screw trap located at the river mouth. The date of 50% cumulative smolt descent correlated significantly with the date when the river temperature exceeded 8°C for both Atlantic salmon and sea trout smolts. In 2010, smolts of both species were passive integrated transponder (PIT)-tagged, and the diel timing of their migration was precisely documented. The degree of night migration decreased in both species as the river temperature rose, and at temperatures above 12–13°C, more smolts migrated during day than during night. A multinomial model was fitted for estimating temperature and species effects on probabilities of migration during night, daytime, dusk and dawn. Atlantic salmon smolts preferred migrating under lower light intensities than sea trout smolts during early, but not late spring when both species migrated during bright daylight. In accordance with the early-season tendency to migrate at night, Atlantic salmon smolts migrated more during darker hours of the day than sea trout. In both species, smaller smolts migrated under dark conditions than during light conditions. Most of the findings on thermal, light and temporal effects on the observed smolt migration pattern can be explained as adaptations to predation avoidance. migration timing, phenology, temperature influence, light intensities, anadromous fish, predation avoidancenb_NO
dc.description.abstractDiel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cuesnb_NO
dc.language.isoengnb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleDiel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cuesnb_NO
dc.title.alternativeDiel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cuesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber541-551nb_NO
dc.source.volume26nb_NO
dc.source.journalEcology of Freshwater Fishnb_NO
dc.source.issue4nb_NO
dc.identifier.doi10.1111/eff.12298
dc.identifier.cristin1372708
dc.relation.projectMiljødirektoratet: 05040029-6nb_NO
dc.relation.projectNorges forskningsråd: 160016nb_NO
cristin.unitcode192,14,0,0
cristin.unitnameMiljøvitenskap og naturforvaltning
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal