Blar i NINA Brage på forfatter "Jonsson, Bror"
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Assessing Movements between Freshwater and Saltwater by Brown Trout (Salmo trutta L.) Based on Otolith Microchemistry
Andersson, Magdalena; Jonsson, Bror; Calles, Olle; Greenberg, Larry (Peer reviewed; Journal article, 2024)By analyzing otolith microchemistry, we examined the use of freshwater and marine environments by brown trout Salmo trutta L. that spawn in the Swedish River Emån and migrate to the Baltic Sea. We estimated the time juveniles ... -
Auren i Søre Osa og Østre Æra, Åmot kommune – 30 år etter driftsstart for Osa kraftverk
Sandlund, Odd Terje; Jonsson, Bror (NINA Rapport;1009, Research report, 2013)Aurens vekst i Søre Osa i 2013 var kraftig redusert sammenlignet med før reguleringen i 1981. Hos fisk i aldersgruppene 0-4 var reduksjonen i lengde etter vekstsesongen mellom 18 og 26 %. I Østre Æra var det ingen systematisk ... -
Biologisk mangfold i ferskvann. Regional vurdering av sjeldne dyr og planter
Aagaard, Kaare; Bækken, Torleif; Jonsson, Bror (NINA Temahefte;21, Book, 2002) -
Biologisk mangfold. Dammer i Nord-Trøndelag 2001 og 2002
Dolmen, Dag; Aagaard, Kåre (NINA Temahefte;23, Book, 2003)Dolmen, D. & Aagaard, K. 2003. Biologisk mangfold. Dammer i Nord-Trøndelag 2001 og 2002. - NINA Temahefte 23. 32pp. -
Biologiske undersøkelser i forbindelse med ny reguleringsplan for Brønnøy Kalk AS
Walseng, Bjørn; Jonsson, Bror; Often, Anders; Reitan, Ole (NINA Rapport;218, Research report, 2006)Walseng, B., Jonsson, B., Often. A. og Reitan, O. 2006. Biologiske undersøkelser i forbindelse med ny reguleringsplan for Brønnøy Kalk AS - NINA Rapport 218. 45 s. I forbindelse med at Brønnøy Kalk AS fremmet forslag om ... -
Body shape and fin size in juvenile Atlantic salmon (Salmo salar): effects of temperature during embryogenesis
Greenberg, Larry; Jonsson, Bror; Norrgård, Johnny R.; Erlandsson, Ann; Bergmann, Eva (Peer reviewed; Journal article, 2021)Temperature during egg incubation and early development influences later life stages of fishes, potentially influencing survival. Throughout its distribution, Atlantic salmon (Salmo salar Linnaeus, 1758) have experienced ... -
Climate-driven biophysical changes in feeding and breeding environments explain the decline of southernmost European Atlantic salmon populations
Almodóvar, Ana; Ayllón, Daniel; Nicola, Graciela G.; Jonsson, Bror; Elvira, Benigno (Peer reviewed; Journal article, 2019)The consistency of the global declining trend of Atlantic salmon (Salmo salar) populations suggests that climate-driven reduced survival and growth at sea are the main driving factors. The southernmost populations have ... -
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 ... -
The effects of egg incubation temperature and parental cross on the swimming activity of juvenile brown trout Salmo trutta
Greenberg, Larry A.; Bergman, Eva; Jonsson, Bror; Filipsson, Kari (Peer reviewed; Journal article, 2023)temperature had carry-over effects on swimming activity of juvenile brown trout, Salmo trutta. Eggs from different crosses involving anadromous and lacustrine-adfluvial parents were incubated under two temperature regimes, ... -
Effekter av klimaendringer på arter, økosystem og samfunn. Sluttrapport fra strategisk instituttsatsing (SIS) 2011-2015
Jonsson, Bror (NINA Temahefte;63, Book, 2016-01-22) -
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 ... -
Egg incubation temperature influences the population-specific outmigration rate of juvenile brown trout Salmo trutta
Jonsson, Bror; Greenberg, Larry (Peer reviewed; Journal article, 2022)The present experiment tested if temperature during embryogenesis and parental heritage affected the migratory behaviour of young brown trout Salmo trutta. Two parental forms were used, a freshwater resident form and an ... -
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 ... -
Environmental influences on life history strategies in partially anadromous brown trout (Salmo trutta, Salmonidae)
Nevoux, Marie; Finstad, Bengt; Davidsen, Jan Grimsrud; Finlay, Ross; Josset, Quentin; Poole, Rusell; Höjesjö, Johan; Aarestrup, Kim; Persson, Lo; Tolvanen, Oula; Jonsson, Bror (Journal article; Peer reviewed, 2019)This paper reviews the life history of brown trout and factors influencing decisions to migrate. Decisions that maximize fitness appear dependent on size at age. In partly anadromous populations, individuals that attain ... -
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 ... -
Felles instituttprogram. Virkninger av forurensning på biologisk mangfold: Vann og vassdrag i by- og tettstedsnære områder. Sluttrapport 1997-2001
Aagaard, Kaare; Bækken, Torleif; Jonsson, Bror (NINA Temahefte;19, Book, 2002)Felles instituttprogram. Virkninger av forurensning på biologisk mangfold: Vann og vassdrag i by- og tettstedsnære områder Sluttrapport 1997-2001. - NINA Temahefte 19, NIVA lnr 4539-2002: 1-80. -
Forslag til overvåkingssystem for sjøørret
Finstad, Bengt; Ulvan, Eva Marita; Jonsson, Bror; Ugedal, Ola; Thorstad, Eva Bonsak; Hvidsten, Nils Arne; Hindar, Kjetil; Karlsson, Sten; Uglem, Ingebrigt; Økland, Finn (NINA rapport;689, Research report, 2011)Finstad, B., Ulvan, E.M., Jonsson, B., Ugedal, O., Thorstad, E.B., Hvidsten, N.A., Hindar, K., Karlsson, S., Uglem, I. & Økland, F. 2011. Forslag til overvåkingssystem for sjøørret. - NINA Rapport 689. 53 s. Prosjektets ... -
Friluftsliv i endring: Felles strategisk instituttprogram mellom NINA, NIBR og NIKU 2004-2008
Skogen, Ketil; Jonsson, Bror (NINA Temahefte;38, Book, 2009)Skogen, K. & Jonsson, B. (red.). 2009. Friluftsliv i endring: Felles strategisk instituttprogram mellom NINA, NIBR og NIKU 2004-2008. – NINA Temahefte 38. 31 s. Det felles instituttprogrammet om friluftslivsforskning har ... -
Gene flow from domesticated escapes alters thelife history of wild Atlantic salmon
Bolstad, Geir Hysing; Hindar, Kjetil; Robertsen, Grethe; Jonsson, Bror; Sægrov, Harald; Diserud, Ola Håvard; Fiske, Peder; Jensen, Arne Johan; Urdal, Kurt; Næsje, Tor; Barlaup, Bjørn Torgeir; Florø-Larsen, Bjørn; Lo, Håvard; Niemela, Eero; Karlsson, Sten (Journal article, 2017)Interbreeding between domesticated and wild animals occurs in several species. This gene flow has long been anticipated to induce genetic changes in life-history traits of wild populations, thereby influencing population ...