Blar i Artikler, rapporter, filmer / Articles, reports, movies på emneord "VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920"
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Circumpolar patterns of Arctic freshwater fish biodiversity: A baseline for monitoring
(Peer reviewed; Journal article, 2019)Climate change, biological invasions, and anthropogenic disturbance pose a threat to the biodiversity and function of Arctic freshwater ecosystems. Understanding potential changes in fish species distribution and richness ... -
Contrasting patterns in trophic niche evolution of polymorphic Arctic charr populations in two subarctic Norwegian lakes
(Peer reviewed; Journal article, 2019-05-15)Parallelism in trophic niches of polymorphic populations of Arctic charr was investigated in two similar subarctic lakes, Tårnvatn and Skøvatn, in northern Norway. Analysis of eleven microsatellite loci confirmed, respectively, ... -
Improved Environmental Status: 50 Years of Declining Fish Mercury Levels in Boreal and Subarctic Fennoscandia
(Peer reviewed; Journal article, 2019)Temporally (1965–2015) and spatially (55°–70°N) extensive records of total mercury (Hg) in freshwater fish showed consistent declines in boreal and subarctic Fennoscandia. The database contains 54 560 fish entries (n: pike ... -
Miljørapportering i oppdrettsforetak: Fast i fisken?
(Peer reviewed; Journal article, 2021)Dette er en studie av miljørapporteringspraksis for en stor andel av norske lakseoppdrettsforetak. Data om miljørapportering i årsberetningen for 2019 og annen informasjon som årsberetningen henviser til, er studert ved ... -
Production growth, company size, and concentration: The case of salmon
(Peer reviewed; Journal article, 2023-08-05)The largest companies in salmon aquaculture are rapidly getting bigger due to organic growth as well as mergers and acquisitions, and the largest are now multi-national companies. There are two main explanations for this ... -
Resource polymorphism in European whitefish: Analysis of fatty acid profiles provides more detailed evidence than traditional methods alone
(Peer reviewed; Journal article, 2019)Resource polymorphism—whereby ancestral generalist populations give rise to several specialised morphs along a resource gradient—is common where species colonise newly formed ecosystems. This phenomenon is particularly ... -
The role of predation risk in structuring life-history traits of crucian carp (Carassius carassius) in a series of small boreal lakes
(Peer reviewed; Journal article, 2023)Predation is a major evolutionary force determining life-history traits in prey by directand indirect mechanisms. This study focuses on life-history trait variation in cruciancarp (Carassius carassius), a species well known ... -
Salmon futures and the Fish Pool market in the context of the CAPM and a three-factor model
(Peer reviewed; Journal article, 2021-07-31)Futures on fresh farmed salmon traded at the Fish Pool market in Norway are analyzed in the context of the Capital Asset Pricing Model (CAPM) and a corresponding three-factor model where contracts are separated based on ... -
Seasonal changes in European whitefish muscle and invertebrate prey fatty acid composition in a subarctic lake
(Peer reviewed; Journal article, 2019)Ambient light and temperature show extreme seasonal variation in subarctic lakes due to the midnight sun period in summer and cold polar night period in winter. These changes have clear impacts on fish feeding and reproduction ... -
Spatio-temporal patterns of eukaryotic biodiversity in shallow hard-bottom communities from the West Antarctic Peninsula revealed by DNA metabarcoding
(Peer reviewed; Journal article, 2023)We studied molecular eukaryotic biodiversity patterns in shallow hard-bottom Antarctic benthic communities using community DNA metabarcoding. Polar ecosystems are extremely exposed to climate change, and benthic macroinvertebrate ... -
Temperature Effects on Recruitment and Individual Growth of Two Antagonistic Fish Species, Perch Perca fluviatilis and Roach Rutilus rutilus, from a Climate Change Perspective
(Peer reviewed; Journal article, 2023)Perch (Perca fluviatilis) in four boreal lakes and sympatric roach (Rutilis rutilis) in two of these lakes were studied by means of gill net sampling, and age and growth were analyzed to explore whether summer temperature ... -
Using mathematical modelling to investigate the adaptive divergence of whitefish in Fennoscandia
(Peer reviewed; Journal article, 2020)Modern speciation theory has greatly benefited from a variety of simple mathematical models focusing on the conditions and patterns of speciation and diversification in the presence of gene flow. Unfortunately the application ...