Blar i NINA Brage på forfatter "Jonsson, Nina"
-
Continuous outmigration and sequential encountering of environmental cues are important for successful homing of hatchery-reared, anadromous brown trout Salmo trutta
Jonsson, Bror; Jonsson, Nina (Peer reviewed; Journal article, 2021)When rehabilitating and reintroducing trout Salmo trutta in rivers, it is a goal that as many as possible survive, home and form self-sustaining populations. Hatcheryreared, anadromous S. trutta have significant lower ... -
Differences in growth between offspring of anadromous and freshwater brown trout Salmo trutta
Jonsson, Bror; Jonsson, Nina (Peer reviewed; Journal article, 2021)In this study, individual growth of juvenile offspring of anadromous and freshwater resident brown trout Salmo trutta and crosses between the two from the River Imsa, Norway, was estimated. The juveniles were incubated ... -
Egg incubation temperature affects the timing of the Atlantic salmon Salmo salar homing migration
Jonsson, Bror; Jonsson, Nina (Journal article; Peer reviewed, 2018)Here, we show that adult Atlantic salmon Salmo salar returned about 2 weeks later from the feeding areas in the North Atlantic Ocean to the Norwegian coast, through a phenotypically plastic mechanism, when they developed ... -
Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean
Jonsson, Bror; Jonsson, Nina; Albretsen, Jon (Journal article; Peer reviewed, 2016)Annual mean total length (LT) of wild one-sea-winter (1SW) Atlantic salmon Salmo salar of the Norwegian River Imsa decreased from 63 to 54 cm with a corresponding decrease in condition factor (K) for cohorts migrating to ... -
Fecundity and water flow influence the dynamics of Atlantic salmon
Jonsson, Bror; Jonsson, Nina (Journal article; Peer reviewed, 2016)Populations are retained at reduced levels by resource competition and environmental stochasticity. In the Norwegian River Imsa, the relationship between fecundity of Atlantic salmon (Salmo salar) spawners and number of ... -
Gytebestandsmål for laksebestander i Norge
Hindar, Ketil; Diserud, Ola; Fiske, Peder; Forseth, Torbjørn; Jensen, Arne J.; Uggedal, Ola; Jonsson, Nina; Sloreid, Svein Erik; Arnekleiv, Jo V.; Saltveit, Svein Jakob; Sægrov, , Harald; Sættem, Leif Magnus (NINA Rapport;226, Research report, 2007)Hindar, K., Diserud, O., Fiske, P., Forseth, T., Jensen, A. J., Ugedal, O., Jonsson, N., Sloreid, S.-E., Arnekleiv, J. V., Saltveit, S. J., Sægrov, H. og Sættem, L. M. 2007 Gytebestandsmål for laksebestander i Norge. – ... -
Hva bestemmer antall villaks?
Jonsson, Bror; Jonsson, Nina (Journal article, 2019) -
Influences of migration phenology on survival are size-dependent in juvenile Atlantic salmon (Salmo salar)
Jonsson, Bror; Jonsson, Marius; Jonsson, Nina (Journal article; Peer reviewed, 2017)Long-distance migratory species can reduce mortality risks by synchronizing the migration event and create confusion by swamping predators with high densities. To reduce confusion, predators are known to primarily select ... -
Knock-on effects of environmental influences during embryonic development of ecothermic vertebrates
Jonsson, Bror; Jonsson, Nina; Hansen, Michael M. (Peer reviewed; Journal article, 2022)Environmental factors influencing parents or offspring during embryogenesis can have knock-on effects at later life stages of the offspring. These effects may prepare the progeny for conditions that they may encounter as ... -
Linking embryonic temperature with adultreproductive investment in Atlantic salmonSalmo salar
Jonsson, Bror; Jonsson, Nina; Finstad, Anders G. (Peer reviewed; Journal article, 2014)The expression of fitness-related traits, such as egg and gonad size, often varies among habitats and exhibits clinal variation along climatic and latitudinal gradients. However, the mechanisms allowing such variations ... -
Maternal inheritance influences homing and growth of hybrid offspring between wild and farmed Atlantic salmon
Jonsson, Bror; Jonsson, Nina (Journal article; Peer reviewed, 2017) -
Optimal size at seaward migration in an anadromous salmonid
Jonsson, Bror; Jonsson, Marius; Jonsson, Nina (Journal article; Peer reviewed, 2016)In 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 ... -
Phenotypic plasticity and epigenetics of fish: Embryo temperature affects later-developing life-history traits
Jonsson, Bror; Jonsson, Nina (Journal article; Peer reviewed, 2019)Temperature during embryonic development affects ecological traits and influences the ability to rapidly adapt to the prevailing conditions in changing environments. Here, we review examples of how these developmental ... -
Sjøørretovervåking i bekker langs Skagerrakkysten, Situasjonen 2004
Jonsson, Bror; Jonsson, Nina (NINA Rapport;24, Research report, 2005)Jonsson, B. og Jonsson, N. 2005. Sjøørretovervåkning i bekker langs Skagerrakkysten: Situasjonen i 2004. - NINA Rapport 24. 14 s. -
Stor er ikke best: Om laksungenes vandring og overlevelse i havet
Jonsson, Nina; Jonsson, Bror (Journal article, 2019) -
Supportive breeders of Atlantic salmon Salmo salar have reduced fitness in nature
Jonsson, Bror; Jonsson, Nina; Jonsson, Marius (Peer reviewed; Journal article, 2019)Wild Atlantic salmon (Salmo salar) are in decline over the entire distribution area, and populations are enhanced by supportive breeding. Parental fish are sampled in rivers, crossed and the offspring reared in hatcheries ... -
Time and size at seaward migration influence the sea survival of Salmo salar
Jonsson, Nina; Jonsson, Bror (Peer reviewed; Journal article, 2014)Whether time of seaward migration of young Atlantic salmon Salmo salar influences their subsequent survival and growth was investigated in the River Imsa, south-western Norway. Salmo salar were tagged when moving downstream ...