Roar Kristoffersen
Roar Kristoffersen
Associate professor University of Tromsø
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Parallel evolution of ecomorphological traits in the European whitefish Coregonus lavaretus (L.) species complex during postglacial times
K Østbye, PA Amundsen, L Bernatchez, A Klemetsen, R Knudsen, ...
Molecular Ecology 15 (13), 3983-4001, 2006
Salmon lice infection of wild sea trout and Arctic char in marine and freshwaters: the effects of salmon farms
PA Bjørn, B Finstad, R Kristoffersen
Aquaculture Research 32 (12), 947-962, 2001
Salmon lice, Lepeophtheirus salmonis (Krøyer), infestation in sympatric populations of Arctic char, Salvelinus alpinus (L.), and sea trout, Salmo trutta (L.), in areas …
PA Bjørn, B Finstad
ICES Journal of Marine Science 59 (1), 131-139, 2002
Aggregation of helminths: the role of feeding behavior of fish hosts
R Knudsen, MA Curtis, R Kristoffersen
Journal of Parasitology 90 (1), 1-7, 2004
Takvatn through 20 years: long-term effects of an experimental mass removal of Arctic charr, Salvelinus alpinus, from a subarctic lake
A Klemetsen, PA Amundsen, PE Grotnes, R Knudsen, R Kristoffersen, ...
Ecology, behaviour and conservation of the charrs, genus Salvelinus, 39-47, 2002
Resource competition and interactive segregation between sympatric whitefish morphs
PA Amundsen, R Knudsen, A Klemetsen, R Kristoffersen
Annales Zoologici Fennici, 301-307, 2004
Parasite communities in two sympatric morphs of Arctic charr, Salvelinus alpinus (L.), in northern Norway
R Knudsen, R Kristoffersen, PA Amundsen
Canadian Journal of Zoology 75 (12), 2003-2009, 1997
Area protection may reduce salmon louse infection risk to wild salmonids
PA Bjørn, R Sivertsgård, B Finstad, R Nilsen, RM Serra-Llinares, ...
Aquaculture Environment Interactions 1 (3), 233-244, 2011
New parasites and predators follow the introduction of two fish species to a subarctic lake: implications for food-web structure and functioning
PA Amundsen, KD Lafferty, R Knudsen, R Primicerio, R Kristoffersen, ...
Oecologia 171 (4), 993-1002, 2013
Seasonal and ontogenetic dynamics in trophic transmission of parasites
PA Amundsen, R Knudsen, AM Kuris, R Kristoffersen
Oikos 102 (2), 285-293, 2003
Infection of whitefish (Coregonus lavaretus L. sl) by Triaenophorus crassus Forel (Cestoda: Pseudophyllidea): a case study in parasite control
PA Amundsen, R Kristoffersen
Canadian Journal of Zoology 68 (6), 1187-1192, 1990
Food borne parasites as indicators of trophic segregation between Arctic charr and brown trout
R Knudsen, PA Amundsen, R Nilsen, R Kristoffersen, A Klemetsen
Environmental Biology of Fishes 83 (1), 107-116, 2008
Differences in risks and consequences of salmon louse, Lepeophtheirus salmonis (Krøyer), infestation on sympatric populations of Atlantic salmon, brown trout, and …
PA Bjørn, B Finstad, R Kristoffersen, RS McKinley, AH Rikardsen
ICES Journal of Marine Science 64 (2), 386-393, 2007
Seasonal dynamics and persistence of Gyrodactylus salaris in two riverine anadromous Arctic charr populations
AC Winger, M Kanck, R Kristoffersen, R Knudsen
Environmental Biology of Fishes 83 (1), 117-123, 2008
Parasite communities of two three-spined stickleback populations in subarctic Norway—effects of a small spatial-scale host introduction
JA Kuhn, R Kristoffersen, R Knudsen, J Jakobsen, DJ Marcogliese, ...
Parasitology Research 114 (4), 1327-1339, 2015
The contribution of imprisonment and release to fatal overdose among a cohort of Norwegian drug abusers
E Ødegård, EJ Amundsen, KB Kielland, R Kristoffersen
Addiction Research & Theory 18 (1), 51-58, 2010
Infection of Salmincola edwardsii (Copepoda: Lernaeopodidae) in an age‐structured population of Arctic charr—a long‐term study
PA Amundsen, R Kristoffersen, R Knudsen, A Klemetsen
Journal of Fish Biology 51 (5), 1033-1046, 1997
Nasjonal lakselusovervåkning 2008 på ville bestander av laks, sjøørret og sjørøye langs Norskekysten samt i forbindelse med evaluering av nasjonale laksevassdrag og laksefjorder
PA Bjørn, B Finstad, R Nilsen, I Uglem, L Asplin, Ø Skaala, KK Boxaspen, ...
Bagatellenes tyranni-samhandlingsstrukturen i et norsk fengsel
R Kristoffersen
Arbeidspsykologisk Institutt, Universitetet i Oslo, 1986
Long-term effects of a stock depletion programme: the rise and fall of a rehabilitated whitefish population
PA Amundsen, R Kristoffersen, R Knudsen, A Klemetsen
Ergebnisse der Limnologie 57, 577-588, 2002
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