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dc.contributor.authorJonsson, Bror
dc.contributor.authorJonsson, Marius
dc.contributor.authorJonsson, Nina
dc.date.accessioned2018-01-19T09:46:14Z
dc.date.available2018-01-19T09:46:14Z
dc.date.created2016-11-17T09:45:16Z
dc.date.issued2016
dc.identifier.citationMarine Ecology Progress Series. 2016, 559 193-200.nb_NO
dc.identifier.issn0171-8630
dc.identifier.urihttp://hdl.handle.net/11250/2478307
dc.description.abstractIn this study, the probabilistic reaction norm was calculated for length at different ages of smolting before seaward migration of Atlantic salmon Salmo salar spawning in the Norwegian River Imsa. The reaction norm was compared with the optimal length at smolting estimated as the product of survival and female fecundity on the return, given their length at smolting. Logistic regression analysis on pre-migratory and migratory fish was used to estimate the probabilistic reaction norm. Length at 50% probability of smolting varied between 11.5 cm and 13.4 cm for age groups 1 to 3 yr with a minimum at Age-2. The estimated optimal length at smolting exhibited a maximum at 13.5 cm. Fecundity of adult females was not significantly affected by their length at smolting, making survival the chief variable influencing the optimal smolt size. The results lend support to the hypotheses that body length at 50% probability of seaward migration was similar for all smolt-age-groups independent of growth, and that mean length at each age of the young fish in fresh water reflected the probability of seaward migration. The slight difference between estimated optimal length at smolting and size at 50% probability of smolting may be chiefly caused by size dependent mortality at sea because of the tagging and larger pre-migratory mortality of young than older juveniles in the river. Thus, size appears crucially important for when to migrate. Migration ecology · Anadromy · Probabilistic reaction norm · Reproductive rate · Logistic regression · Smolt length · Atlantic salmon · Salmo salarnb_NO
dc.language.isoengnb_NO
dc.subjectMigration ecologynb_NO
dc.subjectAnadromynb_NO
dc.subjectProbabilistic reaction normnb_NO
dc.subjectReproductive ratenb_NO
dc.subjectLogistic regressionnb_NO
dc.subjectSmolt lengthnb_NO
dc.subjectAtlantic salmonnb_NO
dc.subjectSalmo salarnb_NO
dc.titleOptimal size at seaward migration in an anadromous salmonidnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber193-200nb_NO
dc.source.volume559nb_NO
dc.source.journalMarine Ecology Progress Seriesnb_NO
dc.identifier.doi10.3354/meps11891
dc.identifier.cristin1401272
dc.relation.projectNorges forskningsråd: 225014nb_NO
dc.relation.projectAndre: Norwegian Environmental Agencynb_NO
dc.relation.projectEgen institusjon: Norwegian Institute for Nature Research (NINA)nb_NO
cristin.unitcode7511,6,0,0
cristin.unitnameOslo
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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