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Gunnar Bratbak's picture
  • E-mailGunnar.Bratbak@uib.no
  • Phone+47 55 58 26 58+47 970 18 791
  • Visitor Address
    Thormøhlensgt. 53 A/B
  • Postal Address
    Postboks 7803
    5020 Bergen

The key words of my research are:

  • Structure and function of marine microbial ecosystems,
  • Carbon and nutrient flow in the microbial food web.
  • Microbial population dynamics and diversity.
  • The ecological significance of virus.
  • Ecological significance of airborne bacteria and virus.
Academic article
  • Müller, Oliver; Wilson, Bryan; Paulsen, Maria Lund; Ruminska, Agnieszka; Rief Armo, Hilde; Bratbak, Gunnar; Øvreås, Lise. 2018. Spatiotemporal dynamics of ammonia-oxidizing Thaumarchaeota in Distinct Arctic water masses. Frontiers in Microbiology. 13 pages.
  • Randelhoff, Achim; Reigstad, Marit; Chierici, Melissa; Sundfjord, Arild; Ivanov, Vladimir; Cape, Matthias; Vernet, Maria; Tremblay, Jean-Éric; Bratbak, Gunnar; Kristiansen, Svein. 2018. Seasonality of the physical and biogeochemical hydrography in the inflow to the Arctic Ocean through Fram Strait. Frontiers in Marine Science. 1-16.
  • Sandaa, Ruth-Anne; Storesund, Julia Endresen; Olesin, Emily Maria; Paulsen, Maria Lund; Larsen, Aud; Bratbak, Gunnar; Ray, Jessica Louise. 2018. Seasonality drives microbial community structure, shaping both eukaryotic and prokaryotic host–viral relationships in an Arctic marine ecosystem. Viruses. 1-22.
  • Paulino, Ana; Larsen, Aud; Bratbak, Gunnar; Evensen, Dale; Erga, Svein Rune; Bye-Ingebrigtsen, Einar; Egge, Jorun Karin. 2018. Seasonal and annual variability in the phytoplankton community of the Raunefjord, west coast of Norway from 2001-2006. Marine Biology Research. 421-435.
  • Sandaa, Ruth-Anne; Bratbak, Gunnar. 2018. Is the virus important? And some other questions. Viruses. 1-4.
  • Müller, Oliver; Seuthe, Lena; Bratbak, Gunnar; Paulsen, Maria Lund. 2018. Bacterial response to permafrost derived organic matter input in an Arctic fjord. Frontiers in Marine Science. 1-12.
  • Tsagaraki, Tatiana Margo; Pree, Bernadette; Leiknes, Øystein; Larsen, Aud; Bratbak, Gunnar; Øvreås, Lise; Egge, Jorun Karin; Spanek, Roman; Paulsen, Maria Lund; Olsen, Yngvar; Vadstein, Olav; Thingstad, T. Frede. 2018. Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study. The ISME Journal. 2694-2705.
  • Lawrence, Janice; Töpper, Joachim Paul; Petelenz-Kurdziel, Elzbieta Anna; Bratbak, Gunnar; Larsen, Aud; Thompson, Eric; Troedsson, Christofer; Ray, Jessica Louise. 2017. Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. Limnology and Oceanography.
  • Lawrence, Janice; Töpper, Joachim Paul; Petelenz-Kurdziel, Elzbieta Anna; Bratbak, Gunnar; Larsen, Aud; Thompson, Eric; Troedsson, Christofer; Ray, Jessica Louise. 2017. Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. Limnology and Oceanography. S244-S253.
  • Erga, Svein Rune; Haugen, Stig Bjarte; Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal; Mork, Kjell Arne; Norland, Svein. 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.
  • Johannessen, Torill Vik; Larsen, Aud; Bratbak, Gunnar; Pagarete, António; Edvardsen, Bente; Egge, Elianne Dunthorn; Sandaa, Ruth-Anne. 2017. Seasonal dynamics of haptophytes and dsDNA algal viruses suggest complex virus-host relationship. Viruses. 18 pages.
  • Šantl-Temkiv, Tina; Amato, Pierre; Gosewinkel, Ulrich; Thyrhaug, Runar; Charton, Anais; Chicot, Benjamin; Finster, Kai; Bratbak, Gunnar; Londahl, Jakob. 2017. High-Flow-Rate Impinger for the Study of Concentration, Viability, Metabolic Activity, and Ice-Nucleation Activity of Airborne Bacteria. Environmental Science and Technology. 11224-11234.
  • Pree, Bernadette; Larsen, Aud; Egge, Jorun Karin; Simonelli, Paolo; Madhusoodhanan, Rakhesh; Tsagaraki, Tatiana; Våge, Selina; Erga, Svein Rune; Bratbak, Gunnar; Thingstad, T. Frede. 2017. Dampened copepod-mediated trophic cascades in a microzooplankton-dominated microbial food web: A mesocosm study. Limnology and Oceanography. 1031-1044.
  • Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena; Seuthe, Lena; Bratbak, Gunnar; Øvreås, Lise. 2017. Changes in marine prokaryote composition with season and depth over an Arctic polar year. Frontiers in Marine Science.
  • Paulsen, Maria Lund; Doré, Hugo; Garczarek, Laurence; Seuthe, Lena; Müller, Oliver; Sandaa, Ruth-Anne; Bratbak, Gunnar; Larsen, Aud. 2016. Synechococcus in the Atlantic Gateway to the Arctic Ocean. Frontiers in Marine Science.
  • Pagarete, António; Grébert, Théophile; Stepanova, Olga; Sandaa, Ruth-Anne; Bratbak, Gunnar. 2015. Tsv-N1: A novel DNA algal virus that infects tetraselmis striata. Viruses. 3937-3953.
  • Bratbak, Gunnar. 2015. On the progress of understanding algal viruses. Perspectives in Phycology. 65-67.
  • Larsen, Aud; Egge, Jorun Karin; Nejstgaard, Jens Christian; Di Capua, Iole; Thyrhaug, Runar; Bratbak, Gunnar; Thingstad, T. Frede. 2015. Contrasting response to nutrient manipulation in Arctic mesocosms are reproduced by a minimum microbial food web model. Limnology and Oceanography. 360-374.
  • Johannessen, Torill Vik; Bratbak, Gunnar; Larsen, Aud; Ogata, Hirotaka; Egge, Elianne Sirnæs; Edvardsen, Bente; Eikrem, Wenche; Sandaa, Ruth-Anne. 2015. Characterisation of three novel giant viruses reveals huge diversity among viruses infecting Prymnesiales (Haptophyta). Virology. 180-188.
  • Medina-Sánchez, Juan Manuel; Delgado-Molina, José Antonio; Bratbak, Gunnar; Bullejos, Francisco José; Villar-Argaiz, Manuel; Carrillo, Presentación. 2013. Maximum in the middle : nonlinear response of microbial plankton to ultraviolet radiation and phosphorus. PLOS ONE. 11 pages.
  • Pagarete, Antonio; Lanzén, Anders; Puntervoll, Pål; Sandaa, Ruth-Anne; Larsen, Aud; Larsen, Jens Borggaard; Allen, Michael J; Bratbak, Gunnar. 2013. Genomic sequence and analysis of EhV-99B1, a new coccolithovirus from the Norwegian fjords. Intervirology. 60-66.
  • Carreira, Cátia; Heldal, Mikal; Bratbak, Gunnar. 2013. Effect of increased pCO(2) on phytoplankton-virus interactions. Biogeochemistry. 391-397.
  • Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin; Sandaa, Ruth-Anne; Larsen, Aud; Thingstad, Tron Frede; Bratbak, Gunnar. 2012. Mg2+ as an indicator of nutritional status in marine bacteria. The ISME Journal. 524-530.
  • Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin; Thingstad, Tron Frede; Bratbak, Gunnar. 2012. An unaccounted fraction of marine biogenic CaCO3 particles. PLOS ONE. 6 pages.
  • Liu, JingWen; Zheng, Tianling; Bratbak, Gunnar; Thyrhaug, Runar. 2011. Virus infection disturbs cyclin expression, leading to cell cycle arrest in the unicellular marine algae Emiliania huxleyi and Chrysochromulina ericina. African Journal of Microbiology Research. 1801-1807.
  • Ogata, Hiroyuki; Ray, Jessica Louise; Toyoda, Kensuke; Sandaa, Ruth-Anne; Nagasaki, Keizo; Bratbak, Gunnar; Claverie, Jean-Michel. 2011. Two new subfamilies of DNA mismatch repair proteins (MutS) specifically abundant in the marine environment. The ISME Journal. 1143-1151.
  • Bratbak, Gunnar; Jacquet, Stephan; Larsen, Aud; Pettersson, Lasse H; Sazhin, Andrey F.; Thyrhaug, Runar. 2011. The plankton community in Norwegian coastal waters-abundance, composition, spatial distribution and diel variation. Continental Shelf Research. 1500-1514.
  • Liu, JingWen; Bratbak, Gunnar; Zheng, Tian Ling; Thyrhaug, Runar. 2011. Effects of virus infection on expression of cell cycle regulatory proteins in the unicellular marine algae Emiliania huxleyi. Acta Oceanologica Sinica. 89-95.
  • Fahlgren, C; Bratbak, Gunnar; Sandaa, Ruth-Anne; Thyrhaug, Runar; Zweifel, Ulla Li. 2011. Diversity of airborne bacteria in samples collected using different devices for aerosol collection. Aerobiologia. 107-120.
  • Allen, Michael J; Lanzén, Anders; Bratbak, Gunnar. 2011. Characterisation of the coccolithovirus intein. Marine Genomics. 1-7.
  • Larsen, Jens Borggaard; Larsen, Aud; Thyrhaug, Runar; Bratbak, Gunnar; Sandaa, Ruth-Anne. 2008. Response of marine viral populations to a nutrient induced phytoplankton bloom at different pCO2 levels. Biogeosciences. 523-533.
  • Larsen, Jens Borggaard; Larsen, Aud; Bratbak, Gunnar; Sandaa, Ruth-Anne. 2008. Phylogenetic analysis of members of the Phycodnaviridae virus family, using amplified fragments of the major capsid protein gene. Applied and Environmental Microbiology. 3048-3057.
  • Monier, Adam; Larsen, Jens Borggaard; Sandaa, Ruth-Anne; Bratbak, Gunnar; Claverie, Jean-Michel ; Ogata, Hiroyuki. 2008. Marine mimivirus relatives are probably large algal viruses. Virology Journal. 8 pages.
  • Thingstad, T. Frede; Bellerby, Richard; Bratbak, Gunnar; Børsheim, Knut Yngve; Egge, Jorun Karin; Heldal, Mikal; Larsen, Aud; Neill, Craig Chandler; Nejstgaard, Jens Christian; Norland, Svein; Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Tanaka, Tsuneo; Thyrhaug, Runar; Tøpper, Birte. 2008. Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. Nature. 387-391.
  • Brussaard, Corina P.D.; Bratbak, Gunnar; Baudoux, Anne-Claire ; Ruardij, Piet. 2007. Phaeocystis and its interaction with viruses. Biogeochemistry. 201-215.
  • Martinez, Joaquín Martínez; Schroeder, Declan C.; Larsen, Aud; Bratbak, Gunnar; Wilson, William H. 2007. Molecular dynamics of Emiliania huxleyi and cooccurring viruses during two separate mesocosm studies. Applied and Environmental Microbiology. 554-562.
  • Martínez-Martínez, Joaquin; Norland, Svein; Thingstad, Tron Frede; Schroeder, Declan C.; Bratbak, Gunnar; Wilsow, William H.; Larsen, Aud. 2006. Variability in microbial population dynamics between similarly perturbed mesocosms. Journal of Plankton Research. 783-791.
  • Yan, XD; Chipman, PR; Castberg, T; Bratbak, Gunnar; Baker, TS. 2005. The marine algal virus PpV01 has an icosahedral capsid with T=219 quasisymmetry. Journal of Virology. 9236-9243.
  • Larsen, Aud; Flaten, Gro Anita Fonnes; Sandaa, Ruth-Anne; Castberg, Tonje; Thyrhaug, Runar; Erga, Svein Rune; Jacquet, Stephan; Bratbak, Gunnar. 2004. Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. Limnology and Oceanography. 180-190.
  • Larsen, Aud; Flaten, Gro Anita Fonnes; Sandaa, Ruth-Anne; Castberg, Tonje; Thyrhaug, Runar; Erga, Svein Rune; Jacquet, Stephan; Bratbak, Gunnar. 2004. Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. Limnology and Oceanography. 180-190.
  • Brussaard, Corina P.D.; Noordeloos, A.A.M.; Sandaa, Ruth-Anne; Heldal, Mikal; Bratbak, Gunnar. 2004. Discovery of a dsRNA virus infecting the marine photosynthetic protist Micromonas pusilla. Virology. 280-291.
  • Landa, Harald; Bratbak, Gunnar; Heldal, Mikal. 2004. Abundance and dynamics of free flagellate scales in marine costal ecosystems. Aquatic Microbial Ecology. 55-62.
  • Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Bratbak, Gunnar. 2003. Virioplankton community structure along a salinity gradient in a solar saltern. Extremophiles. 347-351.
  • Thyrhaug, Runar; Larsen, Aud; Thingstad, Tron Frede; Bratbak, Gunnar. 2003. Stable coexistence in marine algal host-virus systems. Marine Ecology Progress Series. 27-35.
  • Jacquet, Stephan; Bratbak, Gunnar. 2003. Effects of ultraviolet radiation on marine virus–phytoplankton interactions. FEMS Microbiology Ecology. 279-289.
  • Castberg, Tonje; Thyrhaug, Runar; Larsen, Aud; Sandaa, Ruth-Anne; Heldal, Mikal; van Etten, J.L.; Bratbak, Gunnar. 2002. Isolation and characterization of a virus that infects Emiliania huxleyi (Haptophyceae). Journal of Phycology. 767-774.
  • Jacquet, Stephan; Heldal, Mikal; Iglesias-Rodriguez, Debora; Larsen, Aud; Wilson, William; Bratbak, Gunnar. 2002. Flow cytometric Analysis of an E. Huxleyi bloom terminated by viral infection. Aquatic Microbial Ecology. 110-124.
  • Vrede, Katarina; Heldal, Mikal; Norland, Svein; Bratbak, Gunnar. 2002. Elemental composition (C,N,P)and cell volume of exponentially growing and nutrient limited bacterioplankton. Applied and Environmental Microbiology. 2965-2971.
  • Thyrhaug, Runar; Larsen, Aud; Brussaard, Corina P.D.; Bratbak, Gunnar. 2002. Cell cycle dependent virus production in marine phytoplankton. Journal of Phycology. 338-343.
  • Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne; Brussaard, Corina P. D.; Egge, Jorun Karin; Heldal, Mikal; Paulino, Ana; Thyrhaug, Runar; Van Hannen, Eric; Bratbak, Gunnar. 2001. Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. Marine Ecology Progress Series. 47-57.
  • Castberg, Tonje; Larsen, Aud; Sandaa, Ruth-Anne; Brussaard, Corina P. D.; Egge, Jorun Karin; Heldal, Mikal; Thyrhaug, Runar; Van Hannen, Eric; Bratbak, Gunnar. 2001. Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta). Marine Ecology Progress Series. 39-46.
  • Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje; Thyrhaug, Runar; Bratbak, Gunnar. 2001. Isolation and characterization of two viruses with large genome size infecting Chrysochromulina ericina (Prymneriophyceae) and Pyramimonas orientalis (Prasinophyceae). Virology. 272-280.
  • Brussaard, Corina P.D.; Marie, Dominique; Thyrhaug, Runar; Bratbak, Gunnar. 2001. Flow cytometric analysis of phytoplankton viability following viral infection. Aquatic Microbial Ecology. 157-166.
  • Hewson, Ian; O'Neil, Judit M; Heil, Cynthia A; Bratbak, Gunnar; Dennison, William C. 2001. Effects of concentrated viral communities on photosynthesis and community composition of cooccurring benthic microalgae and phytoplankton. Aquatic Microbial Ecology. 1-10.
  • Bratbak, Gunnar; Heldal, Mikal. 2000. Virus rule the waves - the smallest and most abundant members of marine ecosystems. Microbiology Today. 171-173.
  • Rodriguez, F.; Fernandez, E.; Head, R.N.; Harbour, D.S.; Bratbak, Gunnar; Heldal, Mikal. 2000. Temporal variability of viruses, bacteria, phytoplankton and zooplankton in the western English Channel off Plymouth. MANGLER.
  • Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar. 2000. Flow cytometric detection of viruses. Journal of Virological Methods. 175-182.
  • Brussaard, Corina P.D.; Thyrhaug, Runar; Marie, Dominique; Bratbak, Gunnar. 1999. Flow cytometric analysis of virus infection in two marine phytoplankton species, Micromonas pusilla (Prasinophyceae) and Phaeocystis pouchetii (Prymnesiophyceae). Journal of Phycology. 941-948.
  • Marie, Dominique; Brussaard, Corina P.D.; Thyrhaug, Runar; Bratbak, Gunnar; Vaulot, Daniel. 1999. Enumeration of Marine Viruses in Culture and Natural Samples by Flow Cytometry. Applied and Environmental Microbiology. 45-52.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal; Nagasaki, Keizo; Thingstad, Frede. 1998. Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. Aquatic Microbial Ecology. 1-9.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal; Nagasaki, Keizo; Thingstad, Frede. 1998. Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. Aquatic Microbial Ecology. 1-9.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal. 1998. Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 11-16.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal. 1998. Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 11-16.
  • Malin, G.; Wilson, W.H.; Bratbak, Gunnar; Liss, P.S.; Mann, N.H. 1998. Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>. Limnology and Oceanography. 1389-1393.
  • Oren, Aharon; Bratbak, Gunnar; Heldal, Mikal. 1997. Occurrence of virus-like particles in the Dead Sea. Extremophies. 143-149.
  • Tuomi, P.; Torsvik, Terje; Heldal, Mikal; Bratbak, Gunnar. 1997. Bacterial population dynamics in a meromictic lake. Applied and Environmental Microbiology. 2181-2188.
  • Bratbak, Gunnar; Willson, William; Heldal, Mikal. 1996. Viral control of Emiliania huxleyi blooms? Journal of Marine Systems. 75-81.
  • Heldal, Mikal; Norland, Svein; Fagerbakke, Kjell Magne; Thingstad, Tron Frede; Bratbak, Gunnar. 1996. The elemental composition of bacteria: a signature of growth conditions? Marine Pollution Bulletin. 3-9.
  • Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal. 1996. Isolation and characterization of a virus infecting Phaeocystis pouchetii (Prymnesiophyceae). Journal of Phycology. 923-927.
  • Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal. 1996. Isolation and characterisation of a virus infecting Phaeocystis pouchetii (Haptophyceae). Journal of Phycology. 923-927.
  • Gundersen, Kjell; Bratbak, Gunnar; Heldal, Mikal. 1996. Factors influencing the loss of bacteria in preserved seawater samples. Marine Ecology Progress Series. 305-310.
  • Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede; Tuomi, Pirjo. 1996. Dynamics of virus abundance in coastal seawater. FEMS Microbiology Ecology. 263-269.
  • Bratbak, Gunnar; Levasseur, M.; Michaud, M.; Cantin, G.; Fernández, E.; Heimdal, B.R.; Heldal, Mikal. 1995. Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release? Marine Ecology Progress Series. 133-142.
  • Bratbak, Gunnar; Levasseur, M.; Michaud, M.; Cantin, G.; Fernandez, E.; Heimdal, B.R.; Heldal, Mikal. 1995. Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release? Marine Ecology Progress Series. 133-142.
  • Tuomi, Pirjo; Fagerbakke, Kjell Magne; Bratbak, Gunnar; Heldal, Mikal. 1995. Nutritional enrichment of a microbial community: The effects on activity, elemental composition, community structure and virus production. FEMS Microbiology Ecology. 123-134.
  • Heldal, Mikal; Norland, Svein; Bratbak, Gunnar; Riemann, B. 1994. Determination of bacterial cell number and cell volume by means of flow cytometer, transmission electron microscopy, and epifluorescene microscopy. Journal of Microbiological Methods.
  • Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal. 1993. Viral mortality of the marine algae Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
  • Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal. 1993. Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 39-48.
  • Thingstad, Tron Frede; Heldal, Mikal; Bratbak, Gunnar; Dundas, Ingrid. 1993. Are viruses important partners in pelagic food webs? Trends in Ecology & Evolution. 209-213.
  • Dundas, Ingrid; Bratbak, Gunnar; Heldal, Mikal. 1992. Roles of virus/phage in marine microbial ECOSYSTEMS. Short Communications of the 1991 International Biotechnology Conferense. 146-150.
  • Bratbak, Gunnar; Heldal, Mikal; Thingstad, T.F; Riemann, B; Haslund, O.H. 1992. Incorporation of viruses into the budget of microbial C-transfer. A first approach. Mar.Ecol.Prog.. 273-280.
  • Heldal, Mikal; Bratbak, Gunnar. 1991. Production and decay of viruses in aquatic environments. Marine Ecology Progress Series. 205-212.
  • Bratbak, Gunnar; Heldal, Mikal; Norland, Svein; Thingstad, Tron Frede. 1990. Viruses as Partners in Spring Bloom Microbial Trophodynamics. Applied and Environmental Microbiology. 1400-1405.
  • Bratbak, Gunnar. 1990. Virus: Spiller de noen økologisk rolle? Naturen. 148-152.
  • Børsheim, K. Y.; Bratbak, Gunnar; Heldal, Mikal. 1990. Enumeration and biomass estimation on planktonic bacteria and viruses by transmission electron microscopy. Applied and Environmental Microbiology. 352-356.
  • Bergh, Ø; Børsheim, K. Y.; Bratbak, Gunnar; Heldal, Mikal. 1989. High abundance of viruses found in aquatic environments. Nature. 467-468.
Report
  • Bratbak, Gunnar; et al., [Mangler fornavn]. 1998. Algal Virus Workshop : Abstracts - Program - Participiants : Bergen, Norway June 14 - 18, 1998. .
  • Bratbak, Gunnar. 1996. Abstracts - Program - Participants. Fifth European Marine Microbiology Symposium. .
Lecture
  • Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena; Seuthe, Lena; Bratbak, Gunnar; Øvreås, Lise. 2017. A year in the microbial life of a changing Arctic Ocean.
  • Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar; Ray, Jessica Louise; Sandaa, Ruth-Anne. 2010. Use of flow cytometry in air and marine microbiological research.
Popular scientific lecture
  • Bratbak, Gunnar; Heldal, Mikal. 1994. Viruses - the new players in the game...
  • Bratbak, Gunnar; Heldal, Mikal. 1994. Virus og bakterier sin økologiske rolle i akvatiske miljøer.
  • Bratbak, Gunnar. 1994. Virus i vann.
  • Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede. 1994. The possible impact of viruses on marine food webs.
  • Bratbak, Gunnar. 1994. The ecological role of virus.
  • Bratbak, Gunnar. 1994. Oppdagelsen av marine virus.
  • Bratbak, Gunnar; Heldal, Mikal. 1993. Carbon budget in the microbial/viral loop.
Academic lecture
  • Ray, Jessica Louise; Enault, François; Johannessen, Torill Vik; Bratbak, Gunnar; Larsen, Aud; Sandaa, Ruth-Anne. 2017. from light to dark and shallow to deep: Metagenomic analysis of total virus assemblages from arctic seawater provides a first glance of season- and depth-driven virus diversity and dynamics.
  • Paulsen, Maria Lund; Doré, Hugo; Garczarek, Laurence; Seuthe, Lena; Müller, Oliver; Sandaa, Ruth-Anne; Larsen, Aud; Bratbak, Gunnar. 2017. Synechococcus in the Arctic Ocean.
  • Egge, Elianne Dunthorn; Vaulot, Daniel; Larsen, Aud; Bratbak, Gunnar; Uwe, John; Edvardsen, Bente. 2017. Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing.
  • Edvardsen, Bente; Egge, Elianne Dunthorn; Vaulot, Daniel; Larsen, Aud; Bratbak, Gunnar; Moreau, Hervé; John, Uwe. 2017. Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing.
  • Tsagaraki, Tatiana; Egge, Jorun Karin; Bratbak, Gunnar; Leiknes, Øystein; Thingstad, T. Frede; Øvreås, Lise; Sandaa, Ruth-Anne; Petelenz-Kurdziel, Elzbieta Anna; Paulsen, Maria Lund; Stedmon, Colin A.; Norland, Svein; Heldal, Mikal; Larsen, Aud. 2017. Microbial Food web structure in a changing Arctic.
  • Sandaa, Ruth-Anne; Ray, Jessica Louise; Enoult, Francois; Vik Johannessen, Torill; Bratbak, Gunnar; Larsen, Aud; Steen, Ida Helene. 2017. Light and depth - main drivers of marine virus diversity and dynamics in the Arctic - Metagenomic analysis of total viral assemblages from surface to the deep .
  • Ray, Jessica Louise; Lawrence, Janice; Petelenz-Kurdziel, Elzbieta Anna; Sandaa, Ruth-Anne; Larsen, Aud; Bratbak, Gunnar; Thompson, Eric; Troedsson, Christofer. 2016. Role of appendicularians in aquatic viral ecology: particle trapping, ingestion and consequences for the marine microbial food web.
  • Ray, Jessica Louise; Johannessen, Torill Vik; Wilson, Brian C.; Bratbak, Gunnar; Larsen, Aud; Sandaa, Ruth-Anne. 2016. Development of a semi-automated method for metagenomic characterization of total virus assemblages from seasonal high-latitude seawater samples.
  • Edvardsen, Bente; Egge, Elianne Sirnæs; Johannessen, Torill Vik; Eikrem, Wenche; Sandaa, Ruth-Anne; Bittner, Lucie; de Vargas, Colomban; Larsen, Aud; Bratbak, Gunnar; Andersen, Tom. 2014. Diversity and seasonal dynamics of marine haptophytes and their viruses.
  • Edvardsen, Bente; Egge, Elianne Sirnæs; Torill Vik, Johannessen; Sandaa, Ruth-Anne; Eikrem, Wenche; Larsen, Aud; Bittner, Lucie; Andersen, Tom; de Vargas, Colomban; Bratbak, Gunnar; Egge, Jorun Karin; Amundsen, Rita. 2013. Diversity and dynamics of marine haptophytes and their viruses.
  • Pagarete, Antonio; Puntervoll, Pål; Lanzén, Anders; Sandaa, Ruth-Anne; Larsen, Aud; Larsen, J.B.; Allen, M.J.; Bratbak, Gunnar. 2011. Geographic segregation and mechanisms of genetic evolution between coccolithovirus populations: a genomic study.
  • Thingstad, T.F.; Bellerby, Richard; Bratbak, Gunnar; Børsheim, Knut Yngve; Egge, Jorun Karin; Heldal, Mikal; Larsen, A.; Neill, Craig Chandler; Nejstgaard, J.; Norland, Svein; Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Tanaka, Tsuneo; Thyrhaug, Runar; Töpper, B. 2008. Increased level of CO2 in the ecosphere may modify the structure of marine plankton.
  • Bratbak, Gunnar. 2007. Virus in aquatic ecosystems: Who are they and what are they doing?
  • Bratbak, Gunnar. 2007. Virus Ecology.
  • Thyrhaug, Runar; Einen, Jørn; Sandaa, Ruth-Anne; Heldal, Mikal; Bratbak, Gunnar. 2007. Total numbers and activity of environmental airborne bacteria.
  • Bratbak, Gunnar. 2006. The global role of viruses in bloom termination, biodiversity and marine ecology.
  • Bratbak, Gunnar. 2006. Algal Viruses –a Diverse Group with Ecological Impact.
  • Heldal, Mikal; Norland, Svein; Bratbak, Gunnar; Thingstad, Tron Frede. 2005. X-ray microanalyses of bacteria at the single cell level: Does elemental composition of cells relate to activity and nutritional status of cells?
  • Heldal, Mikal; Norland, Svein; Thingstad, Tron Frede; Bratbak, Gunnar. 2005. Single cell analysis: X-ray microanalysis in TEM.
  • Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede; Norland, Svein. 2005. Single cell analysis: X-ray microanalysis in TEM.
  • Bratbak, Gunnar. 2005. Methods in viral ecology.
  • Bratbak, Gunnar. 2005. An overview of algal viruses.
  • Sandaa, Ruth-Anne; Bratbak, Gunnar. 2004. Viral diversity in solar saltern.
  • Bratbak, Gunnar. 2003. Vyer for Fremtiden?
  • Bratbak, Gunnar. 2003. Counting and Characterization of Microalgae, Bacteria and Virus in Marine Ecosystems.
  • Larsen, Aud; Thyrhaug, Runar; Sandaa, Ruth-Anne; Castberg, Tonje; Brussaard, Corina P. D.; Jacobsen, Anita; Heldal, Mikal; Thingstad, Tron Frede; Bratbak, Gunnar. 2002. Marine phytoplankton viruses - ecology, physiology and host virus interactions.
  • Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne; Brussaard, Corina P. D.; Heldal, Mikal; Thyrhaug, Runar; Bratbak, Gunnar. 2002. Marine Phytoplankton Viruses-Ecology, Physiology and Host Virus Interactions.
  • Bratbak, Gunnar. 2002. MICROALGAL VIRUS ECOLOGY.
  • Castberg, Tonje; Bratbak, Gunnar. 2002. Large Algal Viruses, Characterization.
  • Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar. 2000. Virus detection and enumeration using flow cytometry.
  • Sandaa, Ruth-Anne; Larsen, Aud; Castberg, Tonje; Thyrhaug, Runar; Heldal, Mikal; Bratbak, Gunnar. 2000. Population dynamics in the virioplankton community during marine algal blooms.
  • Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar. 2000. Persistent virus infection in marine phytoplankton.
  • Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje; Thyrhaug, Runar; Bratbak, Gunnar. 2000. Isolation and characterization of two marine viruses infecting Chrysochromulina ericina and Pyramimonas orientalis.
  • Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar; Brussaard, Corina P. D. 2000. Is Virus Production in Marine Algae Cell-cycle Dependent?
  • Brussaard, Corina P.D.; Sandaa, Ruth-Anne; Bratbak, Gunnar. 2000. Infection of Micromonas pusilla (Prasinophyceae) by a dsRNA virus.
  • Castberg, Tonje; Graves, M.V.; Bratbak, Gunnar; van Etten, J.L. 2000. Extracellular Release of DNA During High-Dose PBCV-1 Infection of Chlorella.
  • Bratbak, Gunnar; Brussaard, Corina P. D.; Castberg, Tonje; Egge, Jorun Karin; Heldal, Mikal; Larsen, Aud; Paulino, Ana; Sandaa, Ruth-Anne; Thyrhaug, Runar; Van Hannen, Eric. 2000. Diversity and succession of algae, virus and bacteria in nutrient enriched seawater enclosures.
  • Castberg, Tonje; Sandaa, Ruth-Anne; Bratbak, Gunnar. 2000. Bacterial population dynamics and diversity after viral lysis of three different algal species.
  • Castberg, Tonje; Bratbak, Gunnar. 2000. Bacterial population dynamics and diversity after viral lysis of three different algal species.
  • Brussaard, Corina P.D.; Bratbak, Gunnar. 1999. Viral control of phytoplankton blooms.
  • Bratbak, Gunnar. 1999. Phytoplankton Viruses - Ecology And Host Virus Interactions.
  • Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar. 1999. Flow Cytometric Analysis Of Virus Infected Phytoplankton.
  • Bratbak, Gunnar. 1999. Algal Viruses - Characterization of new viruses and Quantification by Flow Cytometry and Pulsefield Gelelectrophoresis.
  • Heldal, Mikal; Tuomi, P.; Norland, Svein; Bratbak, Gunnar. 1998. Isolates of marine bacteria: elemental content relates to growth conditions [poster].
  • Marie, Dominique; Brussard, Corina; Thyrhaug, Runar; Bratbak, Gunnar; Vaulot, Daniel. 1998. Enumeration of viruses in marine samples by flow cytometry [poster].
  • Malin, G.; Wilson, W.H.; Bratbak, Gunnar; Liss, P.S.; Mann, N.H. 1998. Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>.
  • Bratbak, Gunnar. 1998. Ecology of algal host-virus interactions.
  • Bratbak, Gunnar; Heldal, Mikal. 1998. Ecology of Phaeocystis host-virus interactions.
  • Bratbak, Gunnar; Heldal, Mikal. 1998. Ecology of <EM>Phaeocystis</EM> host-virus interactions.
  • Castberg, Tonje; Enger, Øivind; Bratbak, Gunnar. 1998. Detection of <EM>Phaeocytus</EM>-virus by PCR.
  • Brussard, Corina; Marie, Dominique; Thyrhaug, Runar; Vaulot, Daniel; Bratbak, Gunnar. 1998. Characterization of virus infected phytoplankton cells by FCN.
  • Flaten, Gro Anita Fonnes; Thingstad, T. Frede; Bratbak, Gunnar. 1998. Bacterial activity measured by different single-cell methods.
  • Castberg, Tonje; Bratbak, Gunnar. 1998. Algevirus.
  • Castberg, Tonje; Bratbak, Gunnar; Enger, Øivind. 1998. A PCR approach to specific quantification of <EM>Phaeocytis</EM> virus.
  • Bratbak, Gunnar; Heldal, Mikal; Utkilen, H.; Viken, J. 1997. Viral impact on algal blooms.
  • Thingstad, Tron Frede; Bratbak, Gunnar; Heldal, Mikal; Dundas, Ian. 1997. Trophic interactions controlling the diversity in pelagic microbial food webs.
  • Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede. 1997. The marine microbial ecology revised.
  • Bratbak, Gunnar; Øvreås, Lise; Thingstad, Tron Frede. 1997. Hutchinson's paradox reversed? Is the bacterioplankton diversity lower than predicted by steady state models?
  • Guixa-Boixareu, Núria; Calderón-Paz, Juan; Heldal, Mikal; Bratbak, Gunnar; Pedrós-Alió, Carles. 1996. Viral lysis and bacterivory as prokaryotic loss factors along a salinity gradient.
  • Nagasaki, Keizo; Wilson, William; Heldal, Mikal; Bratbak, Gunnar. 1996. Preliminary analysis of structural proteins and DNA of PpV-1, a large dsDNA virus which is infectious to Phaeocystis pouchetii.
  • Wilson, William; Mallin, Gillian; Bratbak, Gunnar; Mann, Nicholas. 1996. Oceanic Dimethyl sulphide: Elevated Production During Virus Infection of Phaeocystis pouchetii (Hariot) Lagerheim.
  • Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal. 1996. Isolation of a virus infecting Phaeocystis pouchetii (Haptophyceae).
  • Tuomi, Pirjo; Torsvik, Terje; Heldal, Mikal; Bratbak, Gunnar. 1996. Bacterial population dynamics in a meromictic lake Sælenvatnet.
  • Norland, Svein; Bratbak, Gunnar; Fagerbakke, Kjell Magne; Heldal, Mikal. 1995. Quantitative analysis of carbon, nitrogen, oxygen and phosphorous in single bacteria by use of X-ray - TEM.
  • Norland, Svein; Mikal, Heldal; Bratbak, Gunnar; Fagerbakke, Kjell Magne. 1995. Analytical use of Transmission Electron Microscope (TEM) in aquatic microbial ecology.
  • Heldal, Mikal; Bratbak, Gunnar. 1995. Algevirus - kontrollerer de oppblomstringer?
  • Bratbak, Gunnar; Thingstad, Tron Frede; Heldal, Mikal. 1993. Virus and the Microbial Loop, Paradigms and Paradoxes in the microbial loop.
  • Heldal, Mikal; Bratbak, Gunnar. 1993. Decay and fate of aquatic viruses.
Editorial
  • Brussaard, Corina P.D.; Wilhelm, Steven W.; Thingstad, T. Frede; Weinbauer, Markus G.; Bratbak, Gunnar; Heldal, Mikal; Kimmance, Susan A.; Middelboe, Mathias; Nagasaki, Keizo; Paul, John H.; Schroeder, Declan C.; Suttle, Curtis A.; Vaqué, Dolors; Wommack, K. Eric. 2008. Global-scale processes with a nanoscale drive: the role of marine viruses. The ISME Journal. 575-578.
Short communication
  • Gallot-lavallée, Lucie; Pagarete, António; Legendre, Matthieu; Santini, Sebastien; Sandaa, Ruth-Anne; Himmelbauer, Heinz; Ogata, Hiroyuki; Bratbak, Gunnar; Claverie, Jean-Michel. 2015. The 474-kilobase-pair complete genome sequence of CeV-01B, a virus infecting Haptolina (Chrysochromulina) ericina (Prymnesiophyceae). Microbiology Resource Announcements (MRA). 1-2.
Book review
  • Thingstad, T. Frede; Bratbak, Gunnar. 2016. Microbial Oceanography. Viral strategies at sea. Nature. 454-455.
Non-fiction book
  • Bratbak, Gunnar; Heldal, Mikal; Joint, Ian. 1995. Viruses - the new players in the game; their ecologial role and could they mediate genetic exchange by transduction? Springer, Berlin.
Compendium
  • Bratbak, Gunnar. 2001. BIO 101 Basal Biologi Laboratorieøvelser i Cellebiologi.
  • Bratbak, Gunnar; Heldal, Mikal. 1997. Program and group reports from course in Microbial activity and diversity in aquatic interphases.
Doctoral dissertation
  • Paulsen, Maria Lund. 2017. Microbial dynamics in high latitude ecosystems. Responses to mixing, runoff and seasonal variation a rapidly changing environment.
  • Bratbak, Gunnar. 1988. Production, amount and fate of bacterial biomass in marine waters : a discussion of field methods and results in a laboratory perspective.
Interview
  • Bratbak, Gunnar; Finstad, Hanne S. 2002. En Munnfull Virus.
  • Bratbak, Gunnar; Orvik, Ronny. 2001. Stråler algene til døde.
  • Bratbak, Gunnar; Eliassen, Haakon E.H. 2001. Strålende våpen avliver dødsalger.
Documentary
  • Bratbak, Gunnar. 2018. Samler alger, bakterier og virus. Blogg: Arven etter Nansen.
Academic chapter/article/Conference paper
  • Thingstad, T. Frede; Bratbak, Gunnar; Heldal, Mikal. 2008. Aquatic phage ecology.
  • Heldal, Mikal; Bratbak, Gunnar; Erichsen, Egil S.; Norland, Svein. 2003. X-ray microanalysis of native aquatic bacteria. 7 pages.
  • Bratbak, Gunnar; Heldal, Mikal. 1993. Total Counts of Viruses in Aquatic Environments.
  • Bratbak, Gunnar. 1993. Microscope methods for measuring bacterial biovolume: epifluorescence microscopy, scanning electron microscopy and transmission electron microscopy.
Poster
  • Mayers, Kyle; Lawrence, Janice; Töpper, Joachim Paul; Skaar, Katrine Sandnes; Petelenz-Kurdziel, Elzbieta Anna; Larsen, Aud; Bratbak, Gunnar; Schatz, Daniella; Vardi, Assaf; Ray, Jessica Louise. 2019. Trophic interactions between filter-feeding mesozooplankton and the Emiliania huxleyi virus.
  • Müller, Oliver; Paulsen, Maria Lund; Seuthe, Lena; Larsen, Aud; Bratbak, Gunnar. 2019. Biological drivers of bacterial communities in the Arctic water inflow region .
  • Lindivat, Mathilde; Larsen, Aud; Bratbak, Gunnar; Hess-Erga, Ole-Kristian; Hoell, Ingunn. 2018. Bacterial Viability and Vitality: Application of Click Chemistry in Flow Cytometry.
  • Müller, Oliver; Øvreås, Lise; Bratbak, Gunnar; Larsen, Aud; Paulsen, Maria Lund; Seuthe, Lena. 2017. How permafrost organic matter input in an Arctic fjord alters the bacterial community structure.
  • Sandaa, Ruth-Anne; Ray, Jessica Louise; Storesund, Julia Endresen; Larsen, Aud; Bratbak, Gunnar. 2016. Marine viral diversity in the Arctic - from surface to deep waters through the long polar night and day.
  • Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena; Bratbak, Gunnar; Øvreås, Lise. 2016. A year in the microbial life of a changing Arctic Ocean.
  • Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin; Bratbak, Gunnar; Sandaa, Ruth-Anne; Larsen, Aud; Thingstad, Tron Frede. 2005. Mg2+ plays an important role in marine bacteria.
  • Norland, Svein; Bratbak, Gunnar; Thingstad, Tron Frede; Heldal, Mikal. 2005. Bacterial physiology at the single cell level: do elemental composition reveals any signatures related to growth, dormancy or death?
  • Larsen, Aud; Flaten, Gro Anita Fonnes; Thyrhaug, Runar; Erga, Svein Rune; Jacquet, Stephan; Bratbak, Gunnar. 2003. Dynamics and succession during the spring bloom in the Norwegian coastal current, with emphasis on the smallest participants.
  • Løvdal, Trond; Heldal, Mikal; Bratbak, Gunnar. 2002. Can UV C-radiation restrict toxic algal blooms? Experimental studies for the determination of suitable radiation dose and fractions of water treated.
  • Yan, X.; Chipman, P.; Castberg, Tonje; Bratbak, Gunnar; Baker, T. 2001. The Structure of PpV01, a Marine Algal Virus With a T=219 Capsid.
  • Larsen, Aud; Flaten, Gro Anita Fonnes; Thyrhaug, Runar; Erga, Svein Rune; Jacquet, Stephan; Bratbak, Gunnar. 2001. Dynamics and succession during the spring bloom in Norwegian coastal current, with emphasis on the smallest participants.
  • Larsen, Aud; Thyrhaug, Runar; Bratbak, Gunnar. 2000. Vedvarende virusinfeksjon i marint fytoplankton.
  • Sandaa, Ruth-Anne; Bratbak, Gunnar. 2000. A method for diversity analysis of viruses in small volumes of seawater.
  • Bratbak, Gunnar; Brussaard, Corina; Castberg, Tonje; Heldal, Mikal; Larsen, Aud; Sandaa, Ruth-Anne; Thingstad, Frede; Thyrhaug, Runar. 1999. Virus i Havet.
  • Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal. 1995. Viral control of algal blooms?
  • Heldal, Mikal; Tuomi, Pirjo; Fagerbakke, Kjell Magne; Norland, Svein; Bratbak, Gunnar. 1995. Detection of polyphosphate bodies in bacteria: fluorescens microscopy and X-ray microanalysis.
Academic literature review
  • Våge, Selina; Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal; Larsen, Aud; Norland, Svein; Paulsen, Maria Lund; Pree, Bernadette; Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Tsagaraki, Tatiana Margo; Øvreås, Lise; Thingstad, T. Frede. 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)

ISI statistics (January, 2018): Articles: 77, Citations: >7000, h-index: 42

Cand. real.  1981

Dr. philos.  1988

2019-23   Partner: The Nansen Legacy – scientific exploration and sustainable management beyond the ice edge (NRC).

2017-22   CoPI: Ridges - Safe Havens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic Ocean (NRC).

2018-21   Partner: MIXsTRUCT - Impact of MIXotrophs on the sTRUCTure of the marine pelagic food web (NRC).

2018-21   Partner: VIROVAC: Filter-feeding mesozooplankton as uncharted accomplices in marine virus ecology (NRC).

2016-20   CoPI: Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean                       AQUACOSM (H2020-INFRAIA)

2013-17   CoPI: Ocean Food web Patrol – Climate Effects: Reducing Targeted Uncertainties with an Integrated Network - OceanCertain (FP7-ENV)

2013-17   PI: Processes and Players in Arctic Marine Pelagic Food Webs - Biogeochemistry, Environment and Climate Change - MicroPolar [µP] (NRC).

Research groups