Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Jan Ivar Koksvik"'
Autor:
James D. M. Speed, Ann M. Evankow, Tanja K. Petersen, Peter S. Ranke, Nellie H. Nilsen, Grace Turner, Kaare Aagaard, Torkild Bakken, Jan G. Davidsen, Glenn Dunshea, Anders G. Finstad, Kristian Hassel, Magne Husby, Karstein Hårsaker, Jan Ivar Koksvik, Tommy Prestø, Vibekke Vange
Publikováno v:
Ecology and Evolution, Vol 12, Iss 11, Pp n/a-n/a (2022)
Abstract Climate change has dramatic impacts on ecological systems, affecting a range of ecological factors including phenology, species abundance, diversity, and distribution. The breadth of climate change impacts on ecological systems leads to the
Externí odkaz:
https://doaj.org/article/a587aa2ce9dd4f8dbfb8047fcfdbf782
Publikováno v:
Fauna Norvegica, Vol 37 (2017)
The calanoid copepod Heterocope borealis has been assumed to have an extremely northern distribution in Norway, limited to the north-eastern parts of Finnmark county. The recent records of the species in Lake Fustvatn and Lake Røssvatn in Nordland c
Externí odkaz:
https://doaj.org/article/d70828cf47ae49d8b298a62736378243
Publikováno v:
Fauna Norvegica
Fauna Norvegica, Vol 37 (2017)
Fauna Norvegica, Vol 37 (2017)
The calanoid copepod Heterocope borealis has been assumed to have an extremely northern distribution in Norway, limited to the north-eastern parts of Finnmark county. The recent records of the species in Lake Fustvatn and Lake Røssvatn in Nordland c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f65729a10719a000a833ae279176b0d
https://hdl.handle.net/11250/2466028
https://hdl.handle.net/11250/2466028
Autor:
Lars Rønning, Jo Vegar Arnekleiv, Aslak Darre Sjursen, Marc Daverdin, Jan Ivar Koksvik, Jan Grimsrud Davidsen
Publikováno v:
Journal of Fish Biology. 85:1992-2002
The aim of this study was to test the hypothesis that hatchery brown trout Salmo trutta smolts, with 50% reduced or no feeding over the last 5 months before release, were more likely to migrate to the sea than individuals with standard feeding ratios
Autor:
Lars Rønning, Jan Grimsrud Davidsen, Marc Daverdin, Jo Vegar Arnekleiv, Jan Ivar Koksvik, Aslak Darre Sjursen
Publikováno v:
Journal of Fish Biology. 85:586-596
To study migration performance and return rates of hatchery brown trout Salmo trutta smolts the first 5 months after release, 50 fish in each year (fork length, LF , 158-288 mm) were in two subsequent years tagged with acoustic transmitters and recor
Autor:
Arne Jensen, Eva B. Thorstad, Laila M. Saksgård, Ola Ugedal, Audun H. Rikardsen, Martin R. Johansen, Jan Ivar Koksvik, Tor F. Næsje
Publikováno v:
Hydrobiologia. 644:217-229
Increased mortality of juvenile Atlantic salmon (Salmo salar L.), related to lowered levels of stored energy following the loss of ice cover during winter, has been observed after hydropower development in the subarctic River Alta, northern Norway. D
Publikováno v:
Aquatic Biology. 5:293-304
Quantitative sampling of phyto- and zooplankton has been carried out for 25 yr in Lake Jonsvatn, Norway, in order to assess changes after the introduction of Mysis relicta. In Lille Jonsvatn, the outlet basin, the cladoceran populations collapsed 7 y
Autor:
Jan Ivar Koksvik, Helge Reinertsen
Publikováno v:
River Research and Applications. 24:720-731
The study was carried out in the upper part of the Alta River (69°58N; 23°24E), on a 3 km stretch that is not covered by ice due to increased winter temperatures after hydroelectric power development in 1987. The aim was to detect potential effects
Autor:
Eiliv Steinnes, Jan Ivar Koksvik
Publikováno v:
Hydrobiologia. 544:51-54
Strontium was determined in trout scales from a river where it is often difficult to distinguish between sea trout and resident brown trout by coloration or other visual marks. Sr values were compared with values in scales from brown trout caught abo
Autor:
Jan Ivar Koksvik, A. Haug
Publikováno v:
SIL Proceedings, 1922-2010. 26:2270-2275