Browsing FoU og forskningsartikler by Author "Vøllestad, Leif Asbjørn"
Now showing items 1-10 of 10
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10 års erfaring med nasjonale laksevassdrag –virker systemet?
L’Abée-Lund, Jan Henning; Skurdal, Jostein; Vøllestad, Leif Asbjørn (Journal article, 2018)Det er >600 lakseførende vassdrag i Norge; 52 nasjonale laksevassdrag og 29 laksefjorder ble opprettet for å gi utvalgte laksebestander bedre beskyttelse. Ordningen omfatter ca. 75 prosent av den norske villaksressursen, ... -
Basin-scale phenology and effects of climate variability on global timing of initial seaward migration of Atlantic salmon (Salmo salar)
Otero, Jaime; L’Abée-Lund, Jan Henning; Castro-Santos, Theodore; Leonardsson, Kjell; Storvik, Geir O.; Johnsson, Bror; Dempson, J. Brian; Russell, Ian; Jensen, Arne Johan; Baglinière, Jean-Luc; Dionne, Mélanie; Armstrong, John Duncan; Romakkaniemi, Atso; Letcher, Benjamin Havens; Kovic, John F.; Erkinaro, Jaakko; Poole, Russell; Rogan, Ger; Lundqvist, Hans; MacLean, Julian C.; Jokikokko, E.; Arnekleiv, Jo Vegar; Kennedy, Richard; Niemelä, Eero; Javierre, P. Caballero; Music, Paul A.; Antonsson, Thorolfur; Gudjonsson, Sigurdur; Veselov, Alexey; Lamberg, Anders; Groom, Steve; Taylor, Benjamin; Taberner, M.; Dillane, Mary; Arnason, Fridthjofur; Horton, Gregg; Hvidsten, Nils A.; Jonsson, Ingi Runar; Jonsson, Nina; Mckelvey, Simon; Næsje, Tor Fredrik; Skaala, Oystein; Smith, Gordon W.; Sægrov, Harald; Stenseth, Nils Chr.; Vøllestad, Leif Asbjørn (Journal article, 2014)Migrations between different habitats are key events in the lives of many organisms. Such movements involve annually recurring travel over long distances usually triggered by seasonal changes in the environment. Often, the ... -
Contemporary ocean warming and freshwater conditions are related to later sea age at maturity in Atlantic salmon spawning in Norwegian rivers
Otero, Jaime; Jensen, Arne J.; L’Abée-Lund, Jan Henning; Stenseth, Nils Chr.; Storvik, Geir O.; Vøllestad, Leif Asbjørn (Journal article, 2012)Atlantic salmon populations are reported to be declining throughout its range, raising major management concerns. Variation in adult fish abundance may be due to variation in survival, growth, and timing of life history ... -
Disentangling local from macroenvironmental effects: Quantifying the effect of human encroachments based on historical river catches of anadromous salmonids
L’Abée-Lund, Jan Henning; Haugen, Thrond; Vøllestad, Leif Asbjørn (Journal article, 2006)In this paper, we use dynamic factor and intervention analysis to identify and quantify the effect of human encroachments on anadromous salmonid catches in 22 Norwegian rivers over a 128-year period. In particular, we ... -
Divergent trends in anadromous salmonid populations in Norwegian and Scottish rivers
Vøllestad, Leif Asbjørn; Hirst, David; L’Abée-Lund, Jan Henning; Armstrong, John Duncan; MacLean, Julian C.; Youngston, Alan F.; Stenseth, Nils Chr. (Journal article, 2009)The Atlantic salmon (Salmo salar) is a charismatic anadromous fish of high conservation and economic value. Concerns have been expressed regarding the long-term viability of fisheries throughout the species’s distributional ... -
Geographic variation and temporal trends in ice phenology in Norwegian lakes over a century
L’Abée-Lund, Jan Henning; Vøllestad, Leif Asbjørn; Brittain, John Edward; Kvambekk, Ånund Sigurd; Solvang, Tord (Journal article, 2020)Observations from 1890 to 2020 of ice phenology for 101 Norwegian lakes were used to detect variation in ice phenology. The average date of ice break-up occurred later in spring with increasing altitude, latitude and ... -
Long‐term variation in the population structure of Arctic charr, Salvelinus alpinus, and brown trout, Salmo trutta
Aass, P.; Jensen, C.S.; L’Abée-Lund, Jan Henning; Vøllestad, Leif Asbjørn (Journal article, 2004)The effects of induced water level fluctuations and introduction of the mysid Mysis relicta Lovén on population structure of brown trout, Salmo trutta L., and Arctic charr, Salvelinus alpinus (L.), were studied during ... -
The potential influence of Atlantic salmon Salmo salar and brown trout Salmo trutta on density and breeding of the white-throated dipper Cinclus cinclus
Nilsson, Anna L. K.; L’Abée-Lund, Jan Henning; Vøllestad, Leif Asbjørn; Jerstad, Kurt; Larsen, Bjørn Mejdell; Røstad, Ole Wiggo; Saltveit, Svein Jakob; Skaugen, Thomas; Stenseth, Nils Chr.; Walseng, Bjørn (Journal article, 2017)Interactions between birds and fish are often overlooked in aquatic ecosystems. We studied the influence of Atlantic salmon and brown trout on the breeding population size and reproductive output of the white-throated ... -
Quantifying the Ocean, Freshwater and Human Effects on Year-to-Year Variability of One-Sea-Winter Atlantic Salmon Angled in Multiple Norwegian Rivers
Otero, Jaime; Jensen, Arne J.; L’Abée-Lund, Jan Henning; Stenseth, Nils Chr.; Storvik, Geir O.; Vøllestad, Leif Asbjørn (Journal article, 2011)Many Atlantic salmon, Salmo salar, populations are decreasing throughout the species' distributional range probably due to several factors acting in concert. A number of studies have documented the influence of freshwater ... -
Spatial and Temporal Variation in the Grilse Proportion of Atlantic Salmon in Norwegian Rivers
L’Abée-Lund, Jan Henning; Vøllestad, Leif Asbjørn; Beldring, Stein (Journal article, 2004)Variation in the sea age at maturity of Atlantic salmon Salmo salar was studied in 158 Norwegian rivers over large spatial (58–71°N; 5–30°E) and temporal (1983–2000) scales. Age at sexual maturity was expressed as the ...