1. Enheten
  2. Ansatte
  3. Roar Kristoffersen
Roar.jpg
Roar.jpg
Institutt for arktisk og marin biologi roar.kristoffersen@uit.no +4777645111 95208950 Tromsø

Kristoffersen, Roar

Førsteamanuensis. Ferskvannsøkologi/parasittologi

Stillingsbeskrivelse

Undervisning:

  • Bachelor- og mastergradskurs i ferskvannsøkologi (Bio-1501, Bio-2501, Bio-2503, Bio-3518, Bio-3521)
  • Bachelor- og mastergradskurs i parasittologi (Bio-2508, Bio-3519)
  • Veiledning av master- og doktorgradsstudenter
  • Soldánová, Miroslava; Kundid, Petra; Scholz, Tomas; Kristoffersen, Roar; Knudsen, Rune. Somatic Dimorphism in Cercariae of a Bird Schistosome. Pathogens 2022; Volum 11 (290). ISSN 2076-0817.s doi: https://doi.org/10.3390/ pathogens11030290.
  • Born-Torrijos, Ana; Van Beest, Gabrielle S.; Vyhlídalová, Tereza; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne; Thieltges, David W.; Soldánová, Miroslava. Taxa-specific activity loss and mortality patterns in freshwater trematode cercariae under subarctic conditions. Parasitology 2021. ISSN 0031-1820.s doi: 10.1017/S0031182021002006.
  • Born-Torrijos, Ana; Paterson, Rachel; van Beest, Gabrielle; Vyhlídalová, Tereza; Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne; Soldánová, Miroslava. Cercarial behaviour alters the consumer functional response of three-spined sticklebacks. Journal of Animal Ecology 2021; Volum 90. ISSN 0021-8790.s 978 - 988.s doi: 10.1111/1365-2656.13427.
  • Born-Torrijos, Ana; Paterson, Rachel; van Beest, Gabrielle; Schwelm, Jessica; Vyhlídalová, Tereza; Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne; Soldánová, Miroslava. Temperature does not influence functional response of amphipods consuming different trematode prey. Parasitology Research 2020. ISSN 0932-0113.s doi: 10.1007/s00436-020-06859-1.
  • Murzina, Svetlana; Sokolov, Sergey G.; Pekkoeva, Svetlana N.; Ieshko, Evgeny P.; Nemova, Nina N.; Kristoffersen, Roar; Falk-Petersen, Stig. First data on the parasite fauna of daubed shanny Leptoclinus maculatus (Fries 1838) (Actinopterygii, Perciformes: Stichaeidae) in Svalbard waters. Polar Biology 2019; Volum 42 (4). ISSN 0722-4060.s 831 - 834.s doi: 10.1007/s00300-018-02448-2.
  • Henriksen, Eirik Haugstvedt; Frainer, André; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M.; Lafferty, Kevin D.; Amundsen, Per-Arne. Fish culling reduces tapeworm burden in Arctic charr by increasing parasite mortality rather than by reducing density-dependent transmission. Journal of Applied Ecology 2019; Volum 56 (6). ISSN 0021-8901.s 1482 - 1491.s doi: 10.1111/1365-2664.13369.
  • Amundsen, Per-Arne; Primicerio, Raul; Smalås, Aslak; Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Long-term ecological studies in northern lakes – challenges, experiences and accomplishments. Limnology and Oceanography 2018; Volum 64. ISSN 0024-3590.s S11 - S21.s doi: 10.1002/lno.10951.
  • Knudsen, Rune; Henriksen, Eirik Haugstvedt; Gjelland, Karl Øystein; Hansen, Haakon; Hendrichsen, Ditte Katrine; Kristoffersen, Roar; Olstad, Kjetil. Are hybrids between Atlantic salmon and brown trout suitable long-term hosts of Gyrodactylus salaris during winter?. Journal of Fish Diseases 2017; Volum 40 (10). ISSN 0140-7775.s 1299 - 1307.s doi: 10.1111/jfd.12602.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. A simplified method to estimate Diphyllobothrium spp. infection in salmonids. Journal of Fish Diseases 2016; Volum 40 (7). ISSN 0140-7775.s 863 - 871.s doi: 10.1111/jfd.12566.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Primicerio, Raul; Amundsen, Per-Arne. Temporal changes and between-host variation in the intestinal parasite community of Arctic charr in a subarctic lake. Hydrobiologia 2016; Volum 783. ISSN 0018-8158.s 79 - 91.s doi: 10.1007/s10750-016-2731-9.
  • Kuhn, Jesper Andreas; Frainer, André; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout - is three-spined stickleback a key species?. Journal of Fish Diseases 2016; Volum 39 (11). ISSN 0140-7775.s 1313 - 1323.s doi: 10.1111/jfd.12467.
  • Hendrichsen, Ditte Katrine; Kristoffersen, Roar; Gjelland, Karl Øystein; Knudsen, Rune; Kusterle, Stefan; Rikardsen, Audun H.; Henriksen, Eirik Haugstvedt; Smalås, Aslak; Olstad, Kjetil. Transmission dynamics of the monogenean Gyrodactylus salaris under seminatural conditions. Journal of Fish Diseases 2015; Volum 38 (6). ISSN 0140-7775.s 541 - 550.s doi: 10.1111/jfd.12263.
  • Kuhn, Jesper Andreas; Kristoffersen, Roar; Knudsen, Rune; Jakobsen, Jonas; Marcogliese, D. J.; Locke, S. A.; Primicerio, Raul; Amundsen, Per-Arne. Parasite communities of two three-spined stickleback populations in subarctic Norway—effects of a small spatial-scale host introduction. Parasitology Research 2015; Volum 114 (4). ISSN 0932-0113.s 1327 - 1339.s doi: 10.1007/s00436-015-4309-2.
  • Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M.; Lafferty, Kevin D.; Siwertsson, Anna; Amundsen, Per-Arne. Ontogenetic dynamics of infection with Diphyllobothrium spp. cestodes in sympatric Arctic charr Salvelinus alpinus (L.) and brown trout Salmo trutta L.. Hydrobiologia 2015; Volum 783. ISSN 0018-8158.s 37 - 46.s doi: 10.1007/s10750-015-2589-2.
  • Amundsen, Per-Arne; Lafferty, Kevin D.; Knudsen, Rune; Primicerio, Raul; Kristoffersen, Roar; Klemetsen, Anders; Kuris, Armand M. New parasites and predators follow the introduction of two fish species to a subarctic lake: implications for food-web structure and functioning. Oecologia 2013; Volum 171 (4). ISSN 0029-8549.s 993 - 1002.s doi: 10.1007/s00442-012-2461-2.
  • Kusterle, Stefan; Kristoffersen, Roar; Rikardsen, Audun H.. Population dynamics of Salmincola salmoneus on Atlantic salmon in a northern Norwegian river. Diseases of Aquatic Organisms 2012; Volum 100 (1). ISSN 0177-5103.s 59 - 70.s doi: 10.3354/dao02489.
  • Winger, Anja Celine; Kristoffersen, Roar; Knudsen, Rune. Rapid transmission of Gyrodactylus salaris (Malmberg, 1957) between live Arctic charr, Salvelinus alpinus (L.), fry. Journal of Fish Diseases 2012; Volum 35 (10). ISSN 0140-7775.s 781 - 784.s doi: 10.1111/j.1365-2761.2012.01419.x.
  • Bjørn, Pål Arne; Sivertsgård, Rolf; Finstad, Bengt; Nilsen, Rune; Serra-Llinares, Rosa Maria; Kristoffersen, Roar. Area protection may reduce salmon louse infection risk to wild salmonids. Aquaculture Environment Interactions 2011; Volum 1 (3). ISSN 1869-215X.s 233 - 244.s doi: 10.3354/aei00023.
  • Siikavuopio, Sten Ivar; Knudsen, Rune; Winger, Anja C; Kristoffersen, Roar. Is the winter period a severe bottleneck of anadromous riverine Arctic charr parr?. Ecology of Freshwater Fish 2009; Volum 18. ISSN 0906-6691.s 126 - 131.s doi: 10.1111/j.1600-0633.2008.00331.x.
  • Winger, Anja Celine; Kristoffersen, Roar; Siikavuopio, Sten Ivar; Knudsen, Rune. Experiments to test if allopatric Salvelinus alpinus are suitable year-round hosts of Gyrodactylus salaris (Monogenea). Journal of Fish Biology 2009; Volum 74 (7). ISSN 0022-1112.s 1476 - 1486.s doi: 10.1111/j.1095-8649.2009.02215.x.
  • Knudsen, Rune; Amundsen, Per-Arne; Nilsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Food borne parasites as indicators of trophic segregation between Arctic charr and brown trout. Environmental Biology of Fishes 2008; Volum 83. ISSN 0378-1909.s 107 - 116.s doi: 10.1007/s10641-007-9216-7.
  • Winger, Anja C; Kanck, Marte; Kristoffersen, Roar; Knudsen, Rune. Seasonal dynamics and persistence of Gyrodactylus salaris in two riverine anadromous Arctic charr populations. Environmental Biology of Fishes 2008; Volum 83. ISSN 0378-1909.s 117 - 123.s doi: 10.1007/s10641-007-9274-x.
  • Winger, Anja C; Primicerio, Raul; Kristoffersen, Roar; Siikavuopio, Sten Ivar; Knudsen, Rune. Gyrodactylus salaris infecting allopatric Arctic charr Salvelinus alpinus fry: an experimental study of host survival. Journal of Fish Biology 2008; Volum 73. ISSN 0022-1112.s 2198 - 2209.s doi: 10.1111/j.1095-8649.2008.02056.x.
  • Bjørn, P.A.; Finstad, B; Kristoffersen, Roar; McKinley, R. S.; Rikardsen, Audun. Differences in risks and consequences of salmon louse, Lepeophtheirus salmonis (Kroyer), infestation on sympatric populations of Atlantic salmon, brown trout, and Arctic charr within northern fjords. ICES Journal of Marine Science 2007; Volum 64. ISSN 1054-3139.s 386 - 393.s doi: 10.1093/icesjms/fsl029.
  • Knudsen, Rune; Adolfsen, Pål; Sandring, Stig; Kristoffersen, Roar; Siikavuopio, Sten Ivar; Rikardsen, Audun. The suitability of anadromous Arctic charr as host and vector of the monogenean Gyrodactylus salaris. Ecology of Freshwater Fish 2007; Volum 16 (1). ISSN 0906-6691.s 99 - 104.s doi: 10.1111/j.1600-0633.2006.00184.x.
  • Østbye, K; Amundsen, Per-Arne; Bernatchez, L; Klemetsen, Anders; Knudsen, Rune; Kristoffersen, Roar; Næsje, TF; Hindar, K. Parallel evolution of ecomorphological traits in the European whitefish Coregonus lavaretus (L.) species complex during postglacial times. Molecular Ecology 2006; Volum 15 (13). ISSN 0962-1083.s 3983 - 4001.
  • Amundsen, Per-Arne; Knudsen, Rune; Klemetsen, Anders; Kristoffersen, Roar. Resource competition and interactive segregation between sympatric whitefish morphs. Annales Zoologici Fennici 2004; Volum 41. ISSN 0003-455X.s 301 - 307.
  • Knudsen, Rune; Curtis, Mark A.; Kristoffersen, Roar. Aggregation of helminths: The role of feeding behavior of fish hosts. Journal of Parasitology 2004; Volum 90 (1). ISSN 0022-3395.s 1 - 7.
  • Amundsen, Per-Arne; Knudsen, Rune; Kuris, Armand M; Kristoffersen, Roar. Seasonal and ontogenetic dynamics in trophic transmission of parasites. Oikos 2003; Volum 102. ISSN 0030-1299.s 285 - 293.
  • Amundsen, Per-Arne; Kristoffersen, Roar; Knudsen, Rune; Klemetsen, Anders. Long-term effects of a stock depletion programme: the rise and fall of a rehabilitated whitefish population. Archiv für Hydrobiologie 2002; Volum 57. ISSN 0003-9136.s 577 - 588.
  • Klemetsen, Anders; Amundsen, Per-Arne; Grotnes, per; Knudsen, Rune; Kristoffersen, Roar; Svenning, Martin-Arne. Takvatn through 20 years: long-term effects of an experimental mass removal of charr Salvelinus alpinus from a large subarctic lake. Environmental Biology of Fishes 2002; Volum 64. ISSN 0378-1909.s 39 - 47.
  • Klemetsen, Anders; Grotnes, per; Amundsen, Per-Arne; Svenning, Martin-Arne; Kristoffersen, Roar; Dahl-Hansen, Geir A. P.; Knudsen, Rune. The emergence of ferox trout Salmo truth in Takvatn, North Norway -an ecological result of the mass removal of arctic charr Salvelinus alpinus. International Society of Arctic Charr Fanatics, Information Series 1998; Volum 6. ISSN 0283-586X.s 16 - 22.
  • Amundsen, Per-Arne; Kristoffersen, Roar; Knudsen, Rune; Klemetsen, Anders. Infection of Salmincola edwardsii (Copepoda: Lernaeopopdidae) in an age-structured population of arctic charr Salvelinus alpinus (L.) - a long-term study. Journal of Fish Biology 1997; Volum 51. ISSN 0022-1112.s 1033 - 1046.
  • Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Parasite communities in two sympatric morphs of Arctic charr, Salvelinus alpinus (L.), in northern Norway. Canadian Journal of Zoology 1997; Volum 75 (12). ISSN 0008-4301.s 2003 - 2009.
  • Kristoffersen, Roar. Temporal changes in parasite load of lake resident Arctic Charr Salvelinus alpinus (L.) held in brackish water cage culture.. Nordic Journal of Freshwater Research 1995; Volum 70. ISSN 1100-4096.s 49 - 55.
  • Kristoffersen, Roar. Occurrence of the digenean Cryptocotyle lingua in farmed Arctic charr Salvelinus alpinus and periwinkles Littorina littorea sampled close to charr farms in northern Norway.. Diseases of Aquatic Organisms 1991; Volum 12 (91). ISSN 0177-5103.s 59 - 65.
  • Klemetsen, Anders; Kristoffersen, Roar; Grotnes, per. Teinefanget røye i oppdrett. Norsk Fiskeoppdrett 1991; Volum 16. ISSN 0332-7132.s 121 - 14.
  • Ringø, Einar; Kristoffersen, Roar; Nilsen, Bård. Wild and hatchery-reared landlocked Arctic charr, Salvelinus alpinus (L.), from Lake Takvatn, reared in fresh and sea water: Content of free amino acids and ninhydrin-positive substances.. Aquaculture 1988; Volum 74. ISSN 0044-8486.s 359 - 367.
  • Kristoffersen, Roar. A new species of parasite on Arctic charr, Salvelinus alpinus (L.), in seawater cages in Scandinavia.. Aquaculture 1988; Volum 71. ISSN 0044-8486.s 187 - 191.
  • Grotnes, per; Kristoffersen, Roar; Klemetsen, Anders; Amundsen, Per-Arne. Villrøye i sjøen, et nytt oppdrettskonsept. Norsk Fiskeoppdrett 1987; Volum 12. ISSN 0332-7132.s 71 - 73.
  • Gjelland, Karl Øystein; Bækkelie, Knut Andreas Eikland; Brabrand, Åge; Kristoffersen, Roar; Svenning, Martin; Eloranta, Antti; Pettersen, Oskar; Saksgård, Randi J.; Solberg, Ingrid; Sandlund, Odd Terje. Overvåking av fisk i store innsjøer – FIST 2018. (fulltekst) 2020 (1749) ISBN 978-82-426-4504-3. ISSN 1504-3312.
  • Murzina, Svetlana A.; Sokolov, Sergey G.; Pekkoeva, Svetlana N.; Ieshko, Evgeny P.; Nemova, Nina N.; Kristoffersen, Roar; Falk-Petersen, Stig. Correction to: First data on the parasite fauna of daubed shanny Leptoclinus maculatus (Fries 1838) (Actinopterygii, Perciformes: Stichaeidae) in Svalbard waters. Polar Biology 2019; Volum 42 (4). ISSN 0722-4060.s 835 - 835.s doi: 10.1007/s00300-019-02475-7.
  • Born-Torrijos, Ana; Vyhlídalová, Tereza; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne; Soldánová, Miroslava. Parasites in the food web: concomitant predation on snail hosts and their trematodes by fish can modulate the risk of infection. 18th International Conference on Diseases of Fish and Shellfish 2017-09-04 - 2017-09-08 2017.
  • Soldánová, Miroslava; Born-Torrijos, Ana; Vyhlídalová, Tereza; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Concomitant predation on parasites and hosts affect trematode transmission success. 23rd Helminthological Days 2017-05-08 - 2017-05-12 2017.
  • Kristoffersen, Roar; Amundsen, Per-Arne; Knudsen, Rune. Statusrapport Takvatn 2017. Årsmøte i Takvatn grunneierlag 2017-03-25 - 2017.
  • Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Takvatnprosjektet (1980-2017): relasjoner til Fustavassdraget?. Årsmøte FUSAM forvaltningslag 2017-06-20 - 2017-06-20 2017.
  • Kristoffersen, Roar; Knudsen, Rune; Amundsen, Per-Arne. Bendelmark i ørret og røye. Jakt og fiske 2017 (9). ISSN 0800-3041.s 60 - 63.
  • Amundsen, Per-Arne; Smalås, Aslak; Knudsen, Rune; Kristoffersen, Roar; Siwertsson, Anna; Klemetsen, Anders. Forskning og kultivering av en overbefolka røyebestand. Septentrio Reports 2015; Volum 2015 (5). ISSN 2387-4597.s 1 - 53.
  • Kuhn, Jesper Andreas; Frainer, A.; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr – is three-spined stickleback a key species?. 6th Conference of the Scandinavian Baltic Society for Parasitology. Uppsala, Sweden 2015.
  • Kuhn, Jesper Andreas; Frainer, A.; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr – is three-spined stickleback a key species?. 6th Conference of the Scandinavian Baltic Society for Parasitology. Uppsala, Sweden 2015-04-23 - 2015.
  • Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M; Lafferty, Kevin D.; Siwertsson, Anna; Amundsen, Per-Arne. Ontogenetic dynamics of Diphyllobothrium infections in sympatric Arctic charr and brown trout. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.
  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Kuhn, Jesper Andreas; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Food web structure in a subarctic lake. Invited guest lecture 2015-05-07 - 2015-05-07 2015.
  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Kuhn, Jesper Andreas; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Towards a holistic view of a lake food web - the importance of including benthic habitats and parasites. Aquatic Biodiversity and Ecosystems Conference - Evolution, interaction and global change 2015-08-30 - 2015-09-04 2015.
  • Amundsen, Per-Arne; Kuhn, Jesper Andreas; Siwertsson, Anna; Knudsen, Rune; Kristoffersen, Roar. Økologi og forvaltning av fiskevatn – Takvatnprosjektet og resultater fra undersøkelser i seks innsjøer i Hamarøy-området. Folkemøte 2015-06-05 - 2015-06-05 2015.
  • Amundsen, Per-Arne; Smalås, Aslak; Knudsen, Rune; Kristoffersen, Roar; Siwertsson, Anna; Klemetsen, Anders. Takvatnprosjektet - Forskning og kultivering av en overbefolka røyeberstand. (fulltekst) 2015.
  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Kuhn, Jesper Andreas; Klemetsen, Anders; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Towards a holistic view of a lake food web - the importance of including benthic habitats and parasites. Research open Day (instituttseminar) 2015-11-19 - 2015-11-19 2015.
  • Kristoffersen, Roar. Long-term dynamics of the ectoparasite Gyrodactylus salaris (Monogenea) in young Arctic charr (Salvelinus alpinus) in two riverine systems in northern Norway.. 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Primicerio, Raul; Amundsen, Per-Arne. Temporal changes and structural variation in the intestinal parasite community of Arctic charr in a subarctic lake. 8th International Charr Symposium 2015-06-14 - 2015-06-18 2015.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Temporal changes and structural variation in the intestinal parasite community of Arctic charr in a subarctic lake. 8th International Charr Symposium - Book of Abstract 2015.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr ‐ is three‐spined stickleback a key species?. Freshwater Ecology seminar, Tromsø, Norway 2014-11-07 - 2014.
  • Knudsen, Rune; Siwertsson, Anna; Klemetsen, Anders; Kristoffersen, Roar; Amundsen, Per-Arne. The role of parasites in food-web of subarctic lakes. Invited guest lecture 2014-05-05 - 2014-05-05 2014.
  • Siwertsson, Anna; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Amundsen, Per-Arne. The role of parasites in food-web topology and dynamics of subarctic lakes – background and current status. Seminar at UC Santa Barbara 2014-02-03 - 2014-02-03 2014.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Long-term population and community responses following ecological perturbation. Invited lecture - The Asymmetry Summit 2014-02-14 - 2014-02-15 2014.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr ‐ is the three‐spined stickleback a key species?. DAFINET workshop, Frederiksberg, Denmark 2014-11-11 - 2014.
  • Kuhn, Jesper Andreas; Kristoffersen, Roar; Knudsen, Rune; Jakobsen, J.; Marcogliese, David J.; Locke, S. A.; Primicerio, Raul; Amundsen, Per-Arne. Parasite communities of two three-spined stickleback (Gasterosteus aculeatus) populations in subarctic Norway - Effects of a local-scale host introduction. GENOMES TO/AUX BIOMES 2014, Montreal, Canada 2014-05-25 - 2014.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr - is three-spined stickleback a key species?. Research Open Day, Department of Arctic and Marine Biology, Tromsø, Norway 2014-11-26 - 2014.
  • Kuhn, Jesper Andreas; Knudsen, Rune; Kristoffersen, Roar; Amundsen, Per-Arne. Effects of fish species composition on Diphyllobothrium spp. infections in subarctic brown trout and Arctic charr ‐ is the three‐spined stickleback a key species?. DAFINET book of abstracts, Frederiksberg, Denmark 2014.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Long-term studies following experimental density depletion of a stunted Arctic charr population - ecological and management implications. Long-term ecological studies in Northern Fennoscandia - Workshop 2013-03-13 - 2013-03-15 2013.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Gjelland, Karl Øystein; Klemetsen, Anders. Long-term studies in relation to fish harvesting and invasions in freshwater systems. AMINOR workshop 2012-01-23 - 2012.
  • Kristoffersen, Roar; Amundsen, Per-Arne; Knudsen, Rune. Statusrapport for fiskebestandene i Takvatn og tre andre innsjøer i Balsfjord og Målselv. Foredrag 2012-06-02 - 2012-06-02 2012.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Long-term effects of experimental density depletion of a stunted Arctic charr population - ecological and management implications. 7th International Charr Symposium 2012-09-03 - 2012-09-06 2012.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar. Statusrapport for fiskebestandene i Sagelvvatn og tre andre innsjøer i Balsfjord og Målselv. Folkemøte - Sagelvvatn 2012-03-24 - 2012.
  • Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar. Statusrapport for fiskebestandene i Josefvatn og tre andre innsjøer i Balsfjord og Målselv. Folkemøte - Josefvatn 2012-03-21 - 2012.
  • Kristoffersen, Roar; Amundsen, Per-Arne. Forsøk med kultivering av overbefolka sik- og røyevatn gjennom uttynningsfiske. Idédugnad: Hvordan utnytte de rike innlandsfiskressursene i Finnmark bedre? 2010-05-27 - 2010-05-28 2010.
  • Kristoffersen, Roar. Uttynningsfiske i nordnorske innsjøer. Forskningsdagene i Tromsø 2010-09-24 - 2010-09-24 2010.
  • Kristoffersen, Roar; Winger, Anja; Knudsen, Rune. Arctic charr - an adequate host to Gyrodactylus salaris. NFR-konferansen Miljø 2015 II 2010-02-16 - 2010-02-17 2010.
  • Winger, Anja Celine; Jakobsen, jonas; Kristoffersen, Roar; Knudsen, Rune. Sublethal physiological effects of Gyrodactylus salaris infecting newly hatched Arctic charr fry. 6th International Charr Symposium 2009-06-15 - 2009-06-18 2009.
  • Kristoffersen, Roar; Knudsen, Rune; Amundsen, Per-Arne. Næringsoverførte parasitter hos ferskvannsfisk: diversitet og endringer i forekomst. Fagseminaret "Helsesituasjonen hos vill fisk - oppdager vi endringene" 2009-03-24 - 2009-03-25 2009.
  • Amundsen, Per-Arne; Kristoffersen, Roar. Innledning. Ottar 2008; Volum 273 (5). ISSN 0030-6703.s 2 - 2.
  • Winger, Anja C; Primicerio, Raul; Kristoffersen, Roar; Siikavuopio, Sten Ivar; Knudsen, Rune. Gyrodactylus salaris infecting allopatric Arctic charr fry: An experimental study of host survival. THE FISHERIES SOCIETY OF THE BRITISH ISLES, Annual Symposium 2008 2008-07-21 - 2008-07-25 2008.
  • Knudsen, Rune; Amundsen, Per-Arne; Kristoffersen, Roar; Primicerio, Raul; DalsbØ, laina h; Evjen, jan knut. Takvatnprosjektet – vellykket kultiverings- og forskningssamarbeid. Ottar 2008; Volum 273 (5). ISSN 0030-6703.s 14 - 21.
  • Kristoffersen, Roar; Winger, Anja C; Knudsen, Rune; Rikardsen, Audun. Gyrodactylus salaris - laksedreper og røyeplager. Ottar 2008; Volum 5 (273). ISSN 0030-6703.s 69 - 72.
  • Kristoffersen, Roar; Knudsen, Rune; Amundsen, Per-Arne. Fiskeparasitter. Ottar 2008; Volum 5 (273). ISSN 0030-6703.s 61 - 68.
  • Kristoffersen, Roar; Amundsen, Per-Arne; Knudsen, Rune. Ferskvann og ferskvannsfisk i Nord-Norge. Ottar 2008; Volum 5 (273). ISSN 0030-6703.s 6 - 13.
  • Amundsen, Per-Arne; Kristoffersen, Roar. Anders Klemetsen – en pioner i nordnorsk ferskvannsforskning. Ottar 2008; Volum 273 (5). ISSN 0030-6703.s 3 - 5.
  • Rikardsen, Audun H.; Kanck, Marte; Winger, Anja; Kristoffersen, Roar; Kanstad Hansen, Øyvind; Knudsen, Rune; Johnsen, Bjørn Ove. Spredningsveier for Gyrodactylus salaris østfra: Undersøkelse av infeksjon på fisk over lakseførende strekning i Signaldalsvassdraget.. 2007.
  • Kanck, Marte; Winger, Anja; Knudsen, Rune; Kristoffersen, Roar. Seasonal dynamics of Gyrodactylus salaris (Monogenea) infecting two riverine anadromous populations of Arctic charr (Salvelinus alpinus L.) in Northern Norway.. 5th International Charr Symposium 2006-08-02 - 2006-08-05 2006.
  • Kristoffersen, Roar; Rikardsen, Audun; Langseth, Per E.. Occurrence and possible effects of salmon lice in a population of anadromous Arctic charr in northern Norway. 5th International Charr Symposium 2006-08-02 - 2006-08-05 2006.
  • Winger, Anja C; Knudsen, Rune; Kristoffersen, Roar. Allopatric Arctic charr (Salvelinus alpinus L.) as a long-term host to Gyrodactylus salaris (Monogenea): a field experiment. V International Charr Symposium 2006-08-02 - 2006-08-05 2006.
  • Knudsen, Rune; Amundsen, Per-Arne; Nilsen, Rune; Kristoffersen, Roar; Klemetsen, Anders. Parasites as indicators of trophic segregation between Arctic charr and brown trout. 5th International Charr Symposium 2006-08-02 - 2006-08-05 2006.
  • Bjørn, Pål Arne; Finstad, Bengt; Kristoffersen, Roar. Registreringer av lakselus på laks, sjøørret og sjørøye i 2004. 2005 (60) ISBN 82-426-1598-5. ISSN 1504-3312.
  • Finstad, B.; Økland, F.; Thorstad, E.; Diserud, O.; Bjørn, P.A.; SivertsgÅrd, rolf; Kristoffersen, Roar; McKinley, R. S.; Svenning, Martin A.; Jonsson, Bror. I smoltens kjølvann. Side 48 - 54 i: Svenning, M.-A. & Jonsson, B. (eds.) 2005. Kystøkologi: økosystemprosesser og menneskelig aktivitet. 2005 (31) ISBN 82-426-1613-2. ISSN 0804-421X.
  • Kristoffersen, Roar; Rikardsen, Audun; Winger, Anja; Adolfsen, Pål; Knudsen, Rune. Røye som langtidsvert og smittereservoar for Gyrodactylus salaris i Skibotnelva i Troms. 2005 (36) ISBN 82-426-1559-4. ISSN 1504-3312.
  • Knudsen, Rune; Rikardsen, Audun; Kristoffersen, Roar; Sandring, Stig; Siikavouppio, Sten. Registreringer av Gyrodactylus spp. på fiskesamfunnet i Signaldalselva og Kitdalselva i Troms 2003. 2004 ISBN 82-426-1447-4.
  • Kristoffersen, Roar; Amundsen, Per-Arne; Knudsen, Rune. Uttynningsfisket i Stuorajavri - Foreløpige resultater (2003). 2004.
  • Kristoffersen, Roar; Amundsen, Per-Arne; Knudsen, Rune. Uttynningsfisket i Stuorajavri: Foreløpige resultater (2003). Rapport til Kautokeino kommune.. 2003.
  • Bjørn, Pål Arne; Finstad, Bengt; Kristoffersen, Roar. Registrering av lakselus på laks, sjøørret og sjørøye i 2002. 2003.
  • Bjørn, Pål Arne; Kristoffersen, Roar; Finstad, Bengt. Lakselus på vill sjøørret og sjørøye i Troms sommeren 1999. 2000.
  • Bjørn, Pål Arne; Kristoffersen, Roar; Finstad, Bengt. Registreringer av lakselus på vill sjøørret og sjørøye i Troms sommeren 1998.. 1999.
  • Klemetsen, Anders; Amundsen, Per-Arne; Grotnes, per; Knudsen, Rune; Kristoffersen, Roar; Svenning, Martin-Arne. Long-term development of the arctic charr Salvelinus alpinus of Takvatn: a preliminary report.. International Society of Arctic Charr Fanatics, Information Series 1999; Volum 7. ISSN 0283-586X.s 131 - 134.
  • Bjørn, Pål Arne; Finstad, Bengt; Kristoffersen, Roar. Lakselusa truer sjøørreten!. Jakt og fiske 1998; Volum 1998 (6). ISSN 0800-3041.s 38 - 41.
  • Kristoffersen, Roar; Wartena, Elena. Biologiske undersøkelser av gjeddefangster fra Kautokeinovassdraget.. 1996.
  • Dahl-Hansen, Geir A.P.; Kristoffersen, Roar; Ringstad, Lena. Fiskeribiologiske undersøkelser i syv vann i Kautokeino og Karasjok kommune.. 1995.
  • Svenning, Martin-Arne; Kristoffersen, Roar; Siikavuopio, Sten Ivar; Klemetsen, Anders. Røye i havbeite. Møkkelandsvassdraget og Finnmarksdelen. 1995.
  • Kristoffersen, Roar; Amundsen, Per-Arne. Er parasitter et problem i innsjøer med sik og gjedde?. 1993.
  • Skotvold, Trond; Kristoffersen, Roar; Muladal, Harald; Moen, Helge Karstein. Innlandsfiske i Finnmark:Ressurskartlegging og markedsanalyse.. 1991.
  • Kristoffersen, Roar. Svartprikk-sjuke i røyeanlegg i Nord-Norge.. Norsk Fiskeoppdrett 1991 (2A). ISSN 0332-7132.s 20 - 22.
  • Kristoffersen, Roar. Occurrence of the digenean Cryptocotyle lingua in farmed Arctic charr (Salvelinus alpinus) and periwinkles (Littorina littorea) in northern Norway.. 6th ISACF workshop on Arctic char, 16. – 22. 1990-09-16 - 1990-09-22 1990.
  • Grotnes, Per E.; Kristoffersen, Roar. Ferskvassrøye til oppdrett?. Ottar 1989; Volum 1989 (3). ISSN 0030-6703.s 51 - 57.
  • Kristoffersen, Roar. Parasittene hos Takvassrøya.. Ottar 1989; Volum 1989 (3). ISSN 0030-6703.s 31 - 37.
  • Kristoffersen, Roar. Diphyllobothrium in Lake Takvatn charr.. 4th ISACF workshop on Arctic char 1986-10-06 - 1986-10-11 1986.
  • Amundsen, Per-Arne; Kristoffersen, Roar. Vanlige parasitter hos ferskvannsfisk. Gløtt fra Universitetet i Tromsø.. Nordlys 1982. ISSN 0805-5440.
    • Se alle arbeider i CRIStin →

    Publikasjoner utenom Cristin

    Noen nyere publikasjoner:

    • Winger, A.C., Kristoffersen, R., Siikavuopio, S.I. & Knudsen, R. 2009. Experiments to test if allopatric Salvelinus alpinus (L.) are suitable year-round hosts of Gyrodactylus salaris (Monogenea). Journal of Fish Biology 74: 1 - 11.
    • Winger, A.C., Kanck, M., Kristoffersen, R. & Knudsen, R. 2008. Seasonal dynamics and persistence of Gyrodactylus salaris in two riverine anadromous Arctic charr populations. Environmental Biology of Fishes 83: 117 - 123
    • Winger, A.C., Primicerio, R., Kristoffersen, R., Siikavuopio, S.I. & Knudsen, R. 2008. Gyrodactylus salaris infecting allopatric Arctic charr fry: an experimental study of host survival. Journal of Fish Biology 73: 1 - 12.
    • Bjørn, P.-A., Finstad, B., Kristoffersen, R., Rikardsen, A. & McKinley, R.S. 2007. Differences in risks and consequences of salmon lice, Lepeophtheirus salmonis (Krøyer), infection on sympatric populations of Atlantic salmon, brown trout, and Arctic charr within northern fjords. ICES Journal of Marine Science 64: 386 - 393.
    • Knudsen, R., Adolfsen, P., Sandring, S., Kristoffersen, R., Siikavuopio, S. & Rikardsen, A. 2007. The suitability of anadromous Arctic charr as host and vector of the monogenean Gyrodactylus salaris. Ecology of Freshwater Fishes 16: 99 - 104.
    • Knudsen, R., Curtis, M.A. & Kristoffersen, R. 2004. Aggregation of helminths: the role of feeding behaviour of fish hosts. Journal of Parasitology 90: 1-7.
    • Amundsen, P.-A., Knudsen, R., Kuris, A.M. & Kristoffersen, R. 2003. Seasonal and ontogenetic dynamics in trophic transmission of parasites. Oikos 102: 285 - 293.

    Populærvitenskapelige artikler:

    • Amundsen, P.-A. & Kristoffersen, R. red. 2008. Ferskvannsfisk. Ottar 5-2008. 80 s. Tromsø Museum
    • Kristoffersen, R., Amundsen, P.-A. & Knudsen, R. 2008. Ferskvann og ferskvannsfisk i Nord-Norge. Ottar 5-08: 6 - 13.
    • Kristoffersen, R., Knudsen, R. & Amundsen, P.-A. 2008. Fiskeparasitter. Ottar 5-08: 61 - 68.
    • Kristoffersen, R., Winger, A.C., Knudsen, R. & Rikardsen, A. 2008. Gyrodactylus salaris - laksedreper og røyeplager. Ottar 5-08: 69 - 72.
    • Amundsen, P.-A. & Kristoffersen, R. 2008. Anders Klemetsen - en pioner i nordnorsk ferskvannsforskning. Ottar 5-08: 3 - 5.
    • Knudsen, R., Amundsen, P.-A., Kristoffersen, R., Primicerio, R., Dalsbø, L. & Evjen, J. 2008. Takvatnprosjektet - vellykket kultiverings- og forskningssamarbeid. Ottar 5-08: 14 - 21.
    • Kristoffersen, R., Rikardsen, A., Winger, A.C., Adolfsen, P. & Knudsen, R. 2005. Røye som langtidsvert og smittereservoar for Gyrodactylus salaris i Skibotnelva i Troms. NINA-rapport 36. Norsk institutt for naturforskning, Trondheim. ISBN 82-426-1559-4. 27 s.

    Forskningsinteresser

    • Økologiske interaksjoner mellom parasitter og ferskvannsfisk
    • Epidemiologi til marine parasitter hos oppdrettsfisk
    • Kultivering og forvaltning av ferskvannsfisk

    Medlem i forskningsgruppe

    Freshwater Ecology   Norsk innhold