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Jorun Karin Egge

Professor
  • E-mailJorun.Egge@uib.no
  • Phone+47 55 58 44 84+47 913 92 469
  • Visitor Address
    Thormøhlensgt. 53 A/B
  • Postal Address
    Postboks 7803
    5020 Bergen
Academic article
  • 2018. Seasonal and annual variability in the phytoplankton community of the Raunefjord, west coast of Norway from 2001-2006. Marine Biology Research. 421-435.
  • 2018. Increased CO2 and iron availability effects on carbon assimilation and calcification on the formation of Emiliania huxleyi blooms in a coastal phytoplankton community. Environmental and Experimental Botany. 47-58.
  • 2018. Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study. The ISME Journal. 2694-2705.
  • 2017. Seasonal variations in C:N:Si:Ca:P:Mg:S:K:Fe relationships of seston from Norwegian coastal water: Impact of extreme offshore forcing during winter-spring 2010. Marine Chemistry. 1-12.
  • 2017. Iron availability modulates the effects of future CO2 levels within the marine planktonic food web. Marine Ecology Progress Series. 17-33.
  • 2017. Dampened copepod-mediated trophic cascades in a microzooplankton-dominated microbial food web: A mesocosm study. Limnology and Oceanography. 1031-1044.
  • 2016. Papposphaera obpyramidalis (Haptophyta, Papposphaeraceae):New findings from both Polar Regions. Revue de Micropaleontologie. 267-273.
  • 2016. Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard. Acta Protozoologica. 27-32.
  • 2016. Confirming the "rapid phosphorus transfer from microorganisms to mesozooplankton in the eastern mediterranean sea" scenario through a mesocosm experiment. Journal of Plankton Research. 502-521.
  • 2015. Contrasting response to nutrient manipulation in Arctic mesocosms are reproduced by a minimum microbial food web model. Limnology and Oceanography. 360-374.
  • 2013. Elemental stoichiometry of marine particulate matter measured by wavelength dispersive X-ray fluorescence (WDXRF) spectroscopy. Journal of the Marine Biological Association of the United Kingdom. 2003-2014.
  • 2011. Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea. Polar Biology. 871-882.
  • 2010. Effects of small-scale turbulence on lower trophic levels under different nutrient conditions. Journal of Plankton Research. 197-208.
  • 2010. Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study. Marine Ecology Progress Series. 57-69.
  • 2009. Relationship between phosphate affinities and cell size and shape in various bacteria and phytoplankton. Aquatic Microbial Ecology. 311-320.
  • 2009. Primary production during nutrient-induced blooms at elevated CO2 concentrations. Biogeosciences. 877-885.
  • 2008. Effects of increased atmospheric CO2 on small and intermediate sized osmotrophs during a nutrient induced phytoplankton bloom. Biogeosciences. 739-748.
  • 2008. Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. Nature. 387-391.
  • 2008. Build-up and decline of organic matter during PeECE III. Biogeosciences. 707-718.
  • 2007. Primary production during nutrient-induced blooms at elevated CO2 concentrations. Biogeosciences Discussions. 4385-4410.
  • 2007. Build-up and decline of organic matter during PeECE III. Biogeosciences Discussions. 4539-4570.
  • 2006. Effects of turbulence on TEP dynamics under contrasting nutrient conditions: implications for aggregation and sedimentation processes. Marine Ecology Progress Series. 47-57.
  • 2005. Use of non-limiting substrates to increase size; a generic strategy to simultaneously optimize uptake and minimize predation in pelagic osmotrophs? Ecology Letters.
  • 2001. Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. Marine Ecology Progress Series. 47-57.
  • 2001. Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta). Marine Ecology Progress Series. 39-46.
  • 1998. The hydrography and biology of a bloom of the coccolithophorid Emiliania huxleyi in the northern North Sea. Journal of Sea Research. 255-266.
  • 1997. Influence of silicate addition on vertical flux of particulate biogenic matter. Marine Pollution Bulletin. 10-210.
  • 1996. Production of DMSP and DMS during a mesocosm study of an Emiliania huxleyi bloom: influence of bacteria and Calanus finmarchicus grazing. Marine Biology. 609-618.
  • 1995. Effects of increased concentration of nitrate and phosphate during a springbloom experiment in mesocosm. Journal of Experimental Marine Biology and Ecology. 239-251.
  • 1995. Ecological modelling in coastal waters: Towards predictive physical -chemical-biological simulation models. Ophelia : International Journal of Marine Biology. 5-36.
  • 1994. The 1992 Norwegian Emiliania huxley experiment. An overview. Sarsia. 285-290.
  • 1994. Standing stocks of PIC, POC, PON and Emiliania huxleyi coccospheres and liths in seawather enclosures with different phosphate loadings. Sarsia. 307-317.
  • 1994. Representation of Emiliania huxleyi in phytoplankton simulation models. A first approach. Sarsia. 291-300.
  • 1994. Primary productivity and calification rate in blooms of the coccolithophorid Emiliania huxleyi Lohmann (Hay et Mohler) developing in mesocosms. Sarsia. 401-408.
  • 1994. Blooms of phytoplankton including Emiliania huxleyi (Haptophyta). Effects of nutrient supply in different N:P ratios. Sarsia. 333-348.
  • 1993. Viral mortality of the marine algae Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
  • 1993. Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
  • 1993. A model system approach to biological climate forcing. The example of Emiliania huxleyi. Global and Planetary Change. 27-46.
  • 1992. Silicate as regulating nutrient in phytoplankton competition. Marine Ecology Progress Series. 281-289.
  • 1991. A theoretical model for nutrient uptake in phytoplankton. Marine Ecology Progress Series. 65-72.
Report
  • 1994. Summary of data from enclosure experiments on phytoplankton blooms at Espegrend in 1986-1993. 36. 36. .
  • 1993. Kartlegging av Prymnesium parvum og giftige vannmasser ved hjelp av faste stasjoner i Hylsfjorden, Saudafjorden og Sandsfjorden. .
  • 1993. Eksperimentelle og teoretiske studier av artssuksesjon i planteplanktonoppblomstringer. .
  • 1992. Prymnesium parvum i Ryfylkefjordene. Delprosjekt 5: Kartlegging av P. Parvum og giftige vannmasser ved hjelp av faste stasjoner i Hylsfjorden, Saudafjorden og Sandsfjorden. .
  • 1991. Undersøkelser at Prymnesium parvum i Ryfylkefjordene 1991. SMR Rapport 1/91. Delrapport 7. .
Academic lecture
  • 2017. Microbial Food web structure in a changing Arctic.
  • 2015. INTERACT - interaksjoner mellom miljøfaktorer: pelagiske og bentiske habitat.
  • 2013. Diversity and dynamics of marine haptophytes and their viruses.
  • 2012. When Si and glucose give neither diatoms nor bacteria. A zooplankton effect in an Arctic ecosystem?
  • 2012. Senescent Cyanea capillata jellyfish may contribute to increased autumnal production: A mesocosm study.
  • 2011. Interactions between eutrophication, oil and contaminants in marine ecosystems.
  • 2010. Interactions between eutrophication, oil and contaminants in marine ecosystems.
  • 2010. Ecosystem driver pertubations summer 2009.
  • 2008. Increased level of CO2 in the ecosphere may modify the structure of marine plankton.
  • 2000. Diversity and succession of algae, virus and bacteria in nutrient enriched seawater enclosures.
  • 1993. Norwegian Ehux Mesocosm experiment 1993.
  • 1993. Ecological modelling of coastal waters.
Thesis at a second degree level
  • 2005. Fødeopptak hos blåskjell (Mytilus edulis). Selektivitet og effektivitet ved ulik fødetilgang.
Masters thesis
  • 2006. Effect of ammonium addition and irradiance manipulation on dynamics of micriorganims. A mesocosm study.
Doctoral dissertation
  • 2017. Phytoplankton in a dynamic marine environment: insights from composition and dynamics studies in the Raunefjord (Western Norway).
  • 1994. Nutrient control of phytoplankton growth. Effects of macronutrient composition (N. P. Si) on species succession.
Poster
  • 2014. Jellyfish boost pelagic productivity.
  • 2010. Pelagic Community Response to Multiple Anthropogenic Stressors (BO45B-13).
  • 2005. TURBULENCE STIMULATED UPTAKE OF PHOSPHATE IN LARGE PHYTOPLANKTON.
  • 2004. Pelagic Ecosystems in a High CO2 Ocean: the Mesocosm Approach.
  • 2000. Where do all the nutrients go ?
  • 1999. Effects of increasing mesozooplankton concentrations on the phytoplan kton community in mesocosms.
  • 1995. Viral control of algal blooms?
Academic literature review
  • 2018. Simple models combining competition, defence and resource availability have broad implications in pelagic microbial food webs. 1440-1452.

More information in national current research information system (CRIStin)

Iversen, KR, Primicerio R, Larsen A, Egge JK, Peters F, Guadayol Ó, Jacobsen A, Havskum H, Marrasé C (2010) Effects of small-scale turbulence on lower trophic levels under different nutrient conditions. J. Plank. Res. 32: 197-208

        Tambi H, Fonnes Flaten GA, Egge JK, Bødker G, Jacobsen A, Thingstad TF. (2009). Relationship between phosphate affinities and cell size in varius bacteria and phytoplankton.  dio: 10.3356/ame01369, Aquat Microb Ecol 57: 311-320

        Thingstad,  TF, Bellerby RGJ, Bratbak G, Børsheim KY, Egge JK, Heldal M, Larsen A, Neill C, Nejstgaard J, Norland S, Sandaa R-A, Skjoldal EF, Tanaka T, Thyrhaug R, Töpper B (2008). Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. doi:10.1038/nature07235, Nature, 455, 387-390

      Egge, JK, Thingstad TF, Larsen A,Engel A, Bellerby RGJ, & Riebesell U. Primary production during nutrient –induced blooms at elevated CO2 concentrations. Biogeosciences Discuss., 4, 4385-4410, 2007

      Paulino, AI, Egge JK, Larsen A. Effects of increased atmospheric CO2 on small and intermediate sized osmotrophs during a nutrient indused phytoplankton bloom. Submitted to Biogeoscience.  Biogeosciences, 5, 739-748, 2008

      Schulz, K, Riebesell, U, Bellerby, RGJ, Biswas,  Meyerhöfer,  HM, Müller, MN,  Egge, JK, Nejstgaard, JC, Neill, C, Wohlers, J & Zöllner, E.. Build-up and decline of organic matter during PeECE.  Biogeosciences, 5, 707-718, 2008

        Beauvais S, Pedrotti ML, Egge J, Iversen K, Marrasé C (2006). Effects of turbulence on TEP dynamics under contrasting nutrient conditions: implications for aggregation and sedimentation processes MEPS 323: 47-57

        Thingstad TF, Øvreås L, Egge JK, Løvdal T, Heldal M (2005) Use of non-limiting substrates to increase size; a generic strategy to simultaneously optimize uptake and minimize predation in pelagic osmotrophs? Ecology Letters 8 :675-682

        Helland, S., Nejstgaard J.C, Fyhn, H..J., Egge, J.K. & Båmstedt, U.  (2003) Effects of season, diet and starvation on the free amino acid and protein content of Calanus finmarchicus females. Mar. Biol. 143: 297–306

      Svensen C, Nejstgaard JC, Egge JK, Wassmann P (2002) Pulsing versus constant supply of nutrients (N,P, and Si): effect on phytoplankton, mesozooplankton and vertical flux of biogenic matter. Sci. Mar. 66(3):189-203

      Larsen A, Castberg T, Sandaa RA, Brussaard CPD, Egge J, Heldal M, Paulino A, Thyrhaug R, van Hannen EJ, Bratbak G (2001). Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. Mar.Ecol. Prog. Ser. 221:47-57

        Castberg, T, Larsen, A, Sandaa, RA, Brussard CPD, Egge, JK, Heldal, M, Thyrhaug, R, van Hannen, EJ & Bratbak G (2001). Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta) Mar. Ecol. Prog. Ser. 221:39-46

      Svensen C, Egge, JK & Stiansen JE (2001). Can silicate and turbulence regulate the vertical flux of biogenic matter? A mesocosm study. Mar. Ecol. Prog. Ser. 217: 67-80

      Head, R.N., D.W. Crawford, J. Egge, D. Lesley, S. Kristiansen, E. Marañón, D. Pond, D. Purdie & R. Harris (1998). The hydrography and biology of a bloom of the coccolithophorid Emiliana huxleyi in the Northern North Sea. Journal of Sea Research 39: 255-266

      Williams, P leB,  &  J.K. Egge (1998). The management and Behaviour of the mesocosm. Submitted to Estuarine, Coastal and Shelf  Sea Science. 46: 3-14

      Egge, J.K. (1998). Are diatoms bad competitors at low phosphate concentrations? Journal of Marine Systems. 16:191-198

      Wassmann, P., J.K. Egge, M. Reigstad & D.L. Aksnes (1997)  Influence of silicate on vertical flux on particulate biogenic matter. Mar. Poll. Bull. 400 (33): 10-20

    Egge, J.K. & A. Jacobsen (1997) Influence of silicate on particulate carbon production in phytoplankton. Mar. Ecol. Prog. Ser.: 147: 219-230

      Levasseur, M. S. Michaud, , J.K. Egge, G. Cantin, J.C. Nejstgaard R. Sanders, E. Fernández, P.T. Solberg, B. Heimdal & M. Gosslin (1996). Production of DMSP and DMS during a mesocosm study of an Emiliania huxleyi bloom: Influence of bacteria and Calanus finmarticus grazing.  Mar. Biol.  126: 609 - 618

     Kristiansen, K., J.K. Egge, T. Farbrot, T.M. Johnsen, E.R. Lømsland, S.M. Myklestad & T.F. Thingstad (1995). Growth and vertical migration of Gyrodinium aureolum during a bloom in Norwegian fjords. In: Skjoldal, H.R., C. Hopkins, K.E. Erikstad & H.P. Leinaas [Eds]: Ecology of Fjords and Coastal Waters. Proceedings of the Mare Nor Symposium on the Ecology of Fjords and Coastal Waters, Tromsø, Norway 5-9 December, 1994. Elsevier, p 275-289

     Jacobsen, A. J.K. Egge & B.R. Heimdal (1995). Effects of increased concentration of nitrate and phosphate during a springbloom experiment in mesocosm.  J. exp. mar. Biol. Ecol 187: 239-251

      Aksnes, D.L., K.B. Ulvestad, B.M. Balino, J. Berntsen, J.K. Egge, & E. Svendsen (1995). Ecological modelling in coastal waters: Towards predictive Physical‑Chemical‑Biological simulation models. Ophelia 41: 5-36

      Wal, P. van der, J.D.L. van Bleijswijk & J.K. Egge (1994).  Primary productivity and calcification rate in blooms of the coccolithophorid Emiliania huxleyi (Hay and Mohler) developing in mesocosms.  ‑  Sarsia 79: 401-408

           Heimdal, B.R., J.K. Egge, M.J.V. Veldhuis & P. Westbroek (1994). Introduction to the 1992 Norwegian EHUX experiment.  ‑  Sarsia 79: 285-290

      Egge, J.K. & B.R. Heimdal (1994). Blooms of Emiliania huxleyi in mesocosm experiment; effects of nutrient supply in different N:P ratios.  ‑  Sarsia 79: 333-348

           Bleijswijk, J. van, R. Kempers, P. van der Wal, P. Westbroek, J. Egge & T. Lukk (1994). Standing stocks of PIC, POC, PON and Emiliania huxleyi coccospheres and liths in seawater enclosures with different phosphate loadings.  ‑  Sarsia 79: 307-318

      Aksnes, D.L., J.K. Egge, R. Rosland & B.R. Heimdal (1994). On the representation of Emiliania huxleyi in phytoplankton simulation models.   ‑ Sarsia 79:291-300

      Westbroek, P., C.W. Brown, J. van Bleijswijk, C. Brownlee, G.J. Brummer, M. Conte, J. Egge, E. Fernàndez, R. Jordan, M. Knappertsbush, J. Stefels, M. Veldhuis,

      P. van der Wal & J. Young (1993). A model system approach to biological climate forcing. The example of Emiliania huxleyi. Global and Planetary Changes 8: 27-46.

     Aksnes, D.L. & J.K. Egge (1991) A teoretical model nutrient uptake in phytoplankton. Mar Ecol. Prog. Ser. 70: 65-72 

         Bratbak, G., J.K. Egge & M. Heldal (1993). Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal bloom. Mar. Ecol. Prog. Ser. 93: 39-49

      Egge, J.K. & D.L. Aksnes (1992). Silicate as regulating nutrient in phytoplankton competition. Mar. Ecol. Prog. Ser. 83: 281-289

      Kaartvedt, S., D.L. Aksnes & J.K. Egge (1987). Effects of light on the vertical distribution of Pecten maximus larvae. Mar. Ecol. Prog. Ser. 40: 195-197

 

Research groups