A full publication list and more information at http://www.fbl.ku.dk/kchristoffersen/.
Teaching profile
Basic and advanced courses in aquatic ecology since 1986, advanced courses in aquatic microbiology since 1991 and advanced courses in Arctic biology since 1998. Supervision of 25 master students and 2 PhD students since 1991.
Organized international PhD courses (1998, 2001) co-teacher on 6 international courses (1997-2004), organized 3 courses in Arctic Science for Greenlandic students (1998, 2001, 2002) and guest teacher in Arctic Ecology at Svalbard University, Norway (2004, 2005).
Communication
Participated and presentation of research data in more than 50 national and international meetings.
Co-organizer of international meetings in 1991, 1997, 1998, 1999, 2000, 2003 and 2006.
Contributed in the national media (newspapers, TV and video film) with scientific information/debate.
Invited speaker at international meetings 8 times since 1992.
Commissions of trust
Advisory board member for Academy of Finland and the Swedish Research Council
Head of department and member of the steering committee for the Institute of Biology, UoC.
Board member of the Arctic Station Council, UoC
Member of numerous ad hoc boards and evaluation comities (national and international).
Publication list 1999-2005
Original papers in English (peer reviewed)
2006
Christoffersen, K., Andersen, N., Søndergaard, Mo., Liboriussen, L., & Jeppesen, E. (2006). Implications of climate-enforced temperature increases on freshwater pico- and nanoplakton populations studied in artificial ponds during 16 month. Hybrobiologia 560: 259-266.
2005
Rohrlack, T., Christoffersen, K., & Friberg-Jensen, U. (2005). Frequency of inhibitors of daphnid trypsin in the widely distributed cyanobacterial genus Planktothrix. Environmental Microbiology 7: 1667–1669.
Pålsson, C., Kritzberg, E. S.,, Christoffersen, K. & Granéli, W. (2005). Net heterotrophy in Faroe Islands clear-water lakes: causes and consequences for bacterioplankton and phytoplankton. Freshwater Biology 50: 2011-2020.
Christoffersen, K. (2005). Destructive impact of microcystin in aquatic ecosystems. Kaiyo Monthly 37: 335-343. In Japanese.
Rohrlack, T., Christoffersen, K., Dittmann, E., Nogueira, I., Vasconcelos, V., & Börner, T. (2005). Ingestion of microcystins by Daphnia: Intestinal uptake and toxic effects. Limnology and Oceanography 50: 440-448.
Liboriussen, L., Landkildehus, F., Meerhoff, M., Bramm, M. E., Søndergaard, Mo., Christoffersen, K., Richardson, K., Søndergaard, Ma., Lauridsen, T., & Jeppesen, E. (2005). Global warming: Design of a flow-through shallow lake mesocosm climate experiment. Limnology and Oceanography Methods 3:1-9.
2004
Rohrlack, T., Christoffersen, K., Kabernick, M. & Nielan, B. A. (2004). Cyanobacterial protease inhibitor microviridin J causes a lethal molting disruption in Daphnia pulicaria. Applied Environmental Microbiology 70: 5047-5050.
2003
Lyck, S. & Christoffersen, K. (2003). Microcystin quota, cell division and microcystin net production of precultured Microcystis aeruginosa CYA 228 (Chroococcales, Cyanophyceae) under field conditions. Phycologia 42: 667-674.
Rohrlack, T., Christoffersen, K., Hansen, P. E., Zhang, W., Czarnecki, O., Henning, M., Fastner, J., Nielan, B. A., & Kabernick, M.. Isolation, characterization and quantitative analysis of mivroviridin J, a new Microcystis metabolite toxic to Daphnia. Journal of Chemical Ecology 29: 1757-1770.
Jeppsen, E., Jensen, J. P.,Jensen, C., Lauridsen, T. L., Amsinck, S. L., Christoffersen, K., Søndergaard, M. & Mitchell, S. F. (2003). Sub-fossils of cladocerans in the surface sediment of 135 lakes as proxies for community structure of zooplankton, fish abundance and lake temperature. Hydrobiologia 491: 321-330.
Hyenstrand, P., Rohrlack, T., Metcalf, J., Beattie, K., Codd, G. A. & Christoffersen, K. (2003). Dynamics of dissolved radiolabelled microcystin-LR in lake water. Water Research 37: 3299-3306.
Vadeboncoeur, Y., Jeppesen, E., Schierup, H.-H., Christoffersen, K., Zanden, M. J. V. & Lodge, D. M. (2003). Cultural eutrophication and the loss of benthic energy pathways in lakes. Limnology and Oceanography 48: 1408-1418.
Wendt-Rasch, L. Woin, P. & Christoffersen, K. (2003). Effects of the pyrethroid insecticide, cypermethrin, on a freshwater plankton community studied under field conditions. II. Direct and indirect effects on the species composition. Aquatic Toxicology 63: 373-389.
Friberg-Jensen, U., Christoffersen, K., Wendt-Rasch, & L. Woin, P. (2003). Effects of the pyrethroid insecticide, cypermethrin, on a freshwater plankton community studied under field conditions. I. Direct and indirect effects on abundance measures of organisms at different trophic levels. Aquatic Toxicology 63: 357-371.
Jeppsen, E., Jensen, J. P.,Jensen, C., Faafeng, B., Hessen, D. O., Søndergaard, M., Lauridsen, T., Brettum, P., and Christoffersen, K. (2003). The impact of nutrient state and lake depth on top-down control in the pelagic zone of lakes: study of 466 lakes from the temperate zone to the Arctic. Ecosystems 6: 313-325.
Christoffersen, K. & González, J. M. (2003). An approach to measure ciliate grazing on living heterotrophic nanoflagellates. Hydrobiologia 491: 159-166.
Christoffersen, K., Hansen, B. W., Johansson, L. S. & Krog, E. (2003). Influence of LAS on marine calanoid copepod population dynamics and potential reproduction. Aquatic Toxicology 63: 405-416.
2002
Christoffersen, K. (2002). Previous studies of freshwater biota in Faroese lakes. Ann. Soc. Sci. Færoensis Suppl. 36: 7-13.
Jensen, J. P., Christoffersen, K., Landkildehus, F., Søndergaard, M, Jeppesen, E. & Bagger, J. (202). Water chemistry of five Faroese lakes. Ann. Soc. Sci. Færoensis Suppl. 36: 34-38.
Christoffersen, K., Kritzberg, E., Pålsson, C., Granéli, W. (2002). Abundance and biomass of microbial communities in relation to phyto- and bacterioplankton production in five Faroese lakes. Ann. Soc. Sci. Færoensis Suppl. 36: 59-69.
Jeppesen, E., Christoffersen, K., Malmquist, H. J., Faafeng, B., Hansson, L-A. (2002). Ecology of five Faroese lakes: summary and synthesis. Ann. Soc. Sci. Færoensis Suppl. 36: 126-139.
Selck, H., Riemann, B., Christoffersen, K., Forbes, V. E., Gustavson, K., Hansen, B. W., Jacobsen, J. A., Kusk, O. K. & Petersen, S. (2002) Comparing sensitivity of ecotoxicological effect endpoints between laboratory and filed. Ecotoxicology and Environmental Safety 52: 97-112.
Christoffersen, K. Lyck, S. & Winding, A. (2002). Microbial activity and bacterial community structure during degradation of microcystins. Aquatic Microbial Ecology 27: 125-136.
Jeppesen, E., Søndergaard, M., Søndergaard, M., Christoffersen, K., Theil-Nielsen, J., Jügens, K. & Schlüter, L. (2002). Cascading trophic interactions in the littoral: an enclosure experiment in shallow lake Stigsholm, Denmark. Archiv für Hydrobiologie 153: 533-555.
2001
Samsøe-Petersen, L., Gustavson, K., Madsen, T., Mogensen, B. B., Lassen, P., Skjernov, K., Christoffersen, K. & Jørgensen, E. (2001). Fate and effects of esfenvalerate in agricultural ponds. Environmental Toxiciology and Chemistry 30: 1570-1578.
Kaebernick, M., Rohrlack, T., Christoffersen, K. & Neilan, B. A. (2001). A spontaneous mutant of microcystin biosynthesis: genetic characterisation and effect on Daphnia. Environmental Microbiology 3: 669-679.
Rohrlack, T., Dittmann, E., Börner, T., & Christoffersen, K. (2001). Effects of cell-bound microcystins on survival and feeding of Daphnia. Applied Environmental Microbiology 67: 3523-3329.
Jeppesen, E., Christoffersen, K., Landkildehus, F., Lauridsen, T., Amsick, S. L. & Søndergaard, M. (2001). Fish and crustaceans in northeast Greenland lakes with special emphasis on interactions between Arctic charr (Salvelinus alpinus), Lepidurus arcticus and benthic chydorids. Hydrobiologia 442: 329-337.
Christoffersen, K. (2001). Predation on Daphnia pulex by Lepidurus arcticus. Hydrobiologia 442: 223-229.
2000
Jeppesen, E., Lauridsen, T. L., Mitchell, S .F., Christoffersen, K. & Burns, C. W. (2000). Trophic structure in the pelagial of 25 shallow New Zealand lakes: changes along nutrient and fish gradients. Journal of Plankton Research 22: 951-968.
F. Riget, Lauridsen, T. L., Landkildehus, F., Lauridsen, T., Lauridsen, T. L., Geertz-Hansen, P., Christoffersen, K., & Sparholdt, H. (2000). Landlocked Arctic charr (Salvelinus alpinus) population structure and lake morphometry in Greenland – is ther a connection?. Polar Biology 23: 550-528.
Jørgensen, E. & Christoffersen, K. (2000). Short-term effects of linear alkylbenzene sulfonate on freshwater plankton studied under filed conditions. Environmental Toxicology and Chemistry,19: 904-911.
Christoffersen, K. & Burns C. W. (2000). Toxic cyanobacteria in New Zealand lakes and toxicity to indigenous zooplankton. Verh. Internat. Verein. Limnol. 27: 3222-3225.
1999
Thostrup, L. & Christoffersen, K. (1999). Direct toxic effects of microcystion on survival, growth and fecundity of Daphnia magna. Archiv für Hydrobiologie 145: 447-467.
Anderson, N. J., Bennike, O., Christoffersen, K., Jeppesen, E., Markager, S., Miller, G. & Renberg, I. (1999). Limnological and palaeolimnological studies of lakes in south-western Greenland. Geological Greenland Survey Bulletin 183: 68-74.
Editorial contribution to books in English (peer reviewed)
Christoffersen, K. Jeppesen, E., Enckell, P. H. & Bloch, D.,(eds) (2002). Five Faroese Lakes. Phusico-Chemical and biological aspects. Føroya Frodskaparfelag, Tórshavn, Faroe Islands.
Papers/Reports in English (not peer-reviewed)
Christoffersen, K. & Jeppesen, E. (2005). Lakes. In: Zackenberg Ecological Research Operations, 10th Annual report, 2004. Pages 56-57. M. Rasch & K. Caning & (Eds). Danish Polar Center. Ministry of Science, Technology and Innovation.
Christoffersen, K., Hansen, R. B., & Thomar, J. 2005. Plankton investigations in lakes at southern Disko. In: Arctic biology field course, Qeqertarsuaq 2004. Andersen, A-M, Jørgensen, T. R., & Rahe, K. (Eds). University of Copenhagen.
Closter, A.M., Closter, R. M., Cappelen, J., Christensen, J. H. & Christoffersen, K. (2005). Temperature measurements in Copenhagen from 1767 to 1680. Internal report 05-09. Danish Meteorological Institute. Ministry of Transport and Energy, Copenhagen, Denmark, p. 8.
Christoffersen, K. (2005). Denmark: occurrence, monitoring and management of toxic cyanobacteria. In: I. Chorus (Ed.). Current approaches to cyanotoxin risk assessment, risk management and regulations in different countries, pages 41-47. WaBoLu-Hefte 02/05. Federal Environmental Agency, Berlin, Germany.
Christoffersen, K. & Jeppesen, E. (2004). Lakes. In: Zackenberg Ecological Research Operations, 9th Annual report, 2003. Pages 56-58. M. Rasch & K. Caning & (Eds). Danish Polar Center. Ministry of Science, Technology and Innovaion.
Christoffersen, K., Philipp, M., Bruun, H. H. & Lundgreen, R. (2004). Dispersal of invertebrates and plants by vertebrates in Zackenbergdalen. In: Zackenberg Ecological Research Operations. 9th Annual report, 2003. Pages 81-82. M. Rasch & K. Caning & (Eds). Danish Polar Center. Ministry of Science, Technology and Innovation.
Christoffersen, K. & Jeppesen, E. (2003). Lakes. In: Zackenberg Ecological Research Operations, 8th Annual report, 2002. Pages 50-53. M. Rasch & K. Caning (Eds). Danish Polar Center. Ministry of Science, Technology and Innovation.
Christoffersen, K. & Jeppesen, E. (2003). Lakes. In: Zackenberg Ecological Research Operations, 7th Annual report, 2001. Pages 49-52. K. Caning & M. Rasch & (Eds). Danish Polar Center. Ministry of Science, Technology and Innovation.
Christoffersen, K. & Jeppesen, E. (2003). Lake monitoring. In: Zackenberg Ecological Research Operations, 6th Annual report, 2001. Pages 45-47. K. Caning & M. Rasch (Eds). Danish Polar Center. Ministry of Science, Technology and Innovation.
Schierup, H. H., Christoffersen, K., Vadeboncoeur, Y., Landkildehus, F., Lauridsen, T. L., Jensen, J. P., Amsinck, S. & Jeppesen, E. (2001). Freshwater studies. In: Zackenberg Ecological Research Operations, 5th Annual report, 2000. K. Caning & M. Rasch (Eds). Danish Polar Center, pages 52-55. Ministry of Research & Information Technology.
Christoffersen, K. (2000). Distribution and density of Lepidurus arcticus in ponds and shallow lakes around Zackenberg. In: Zackenberg Ecological Research Operations, 5th Annual report, 1999. K. Caning & M. Rasch (Eds). Danish Polar Center, page 55. Ministry of Research & Information Technology.
Christoffersen, K. & Kaas, H. (2000). Book review. Limnology and Oceangraphy 45: 1212.
Jeppesen, E., Christoffersen, K., Landkildehus, F., Arboe, H. N., Riget, F. & Søndergaard, M. (1999). Lake investigations at Zackenberg. In: Zackenberg Ecological Research Operations. 4th Annual report 1998. Danish Polar Center, pages 43-45. Ministry of Research & Information Technology.
Christoffersen, K., Arboe, H. N., Landkildehus, F., Jeppesen, E. & Søndergaard, M. (1999). Studies of Lepiduris arcticus. Pages In: Zackenberg Ecological Research Operations. 4th Annual report 1998, pages 45-46. Danish Polar Center. Ministry of Research & Information Technology.
Papers and reports in Danish
Christoffersen, K., Brodersen, K. P. & Ryves, D. B. (2004). Palæolimnologisk undersøgelse af sedimentet i Frederiksborg Slotssø. Ferskvandsbiologisk laboratorium, Københavns Universitet, pp. 15.
Lauridsen, T. L., Friberg-Jensen, U., & Christofersen, K., (2003). Effekter af cypermethrin, azoxystrobin og bentatzon på limniske invertebrater. Mijjøprojekt nr. 76, Miljøstyrelsen, pp. 96.
Friberg-Jensen, U. & Christoffersen, K. (2002). Insekticid påvirkning af planktonsamfund. Vand og Jord 9: 51-55.
Christoffersen, K. & Jeppesen, E., (2002). TEMA-rapport om Klimastudier i Østgrønland. Danmarks Miljøundersøgelser, Kap. 12. Energi og Miljøstyrelsen.
Christoffersen, K. (2001). Undersøgelser af microcystin forekomster i Tissø og i indfiltreringsanlæg. Rapport til Vestsjællands Amt, pp. 17.
Christoffersen, K. (2001). Undersøgelser af microcystin i infiltreringsanlæg ved Arrenæs. Rapport til Københavns Vand, pp. 17.
Christoffersn. K. (2000). Forskerspirer i grønland. Diversitet. Forskning og formidling ved Det Naturvidenskabelige Fakultet, Københavns Universitet, p. 30-31.
Christoffersn. K. (2000). Er blågrønalger et problem i danske søer. Vand og Jord 3:104-109.
Christoffersen, K. (2000). Undersøgelser af algetoksiner fra cyanobakterier og tilstedeværelse af heterotrofe bakterier i infiltreringsanlæg ved Tissø. Samlet rapport for 1998-1999 til Vestsjællands Amt, pp. 22.
Woin, P. & Christoffersen, K. (2000). Pesticidproblemer i Øresundsregionen. Rapport fra Forskersymposium i maj 1999. Øresundsuniversitetet, p. 148-154.
Christoffersen, K (1999). Vejledning for: Prøvetagningsprogram for søer i Morænebakkerne, Zackenberg (BioBasis). Til Danmarks Miljøundersøgelser, Arktisk Miljø, pp. 10.
Christoffersen, K. (1999). FREJA - En dyr omgang. Hovedområdet 2, p. 22.
