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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.
Books
  • 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? ISBN: 3-540-60134-1.
Journal articles
  • 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. 196: 1-12. doi: 10.1016/j.marchem.2017.07.001
  • 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. 9. 18 pages. doi: 10.3390/v9040084
  • 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. 63: 244-253. doi: 10.1002/lno.10734
  • 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.
  • 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. 62: 1031-1044. doi: 10.1002/lno.10483
  • 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. 4. doi: 10.3389/fmars.2017.00095
  • 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. 51: 11224-11234. doi: 10.1021/acs.est.7b01480
  • 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. 3:191. doi: 10.3389/fmars.2016.00191
  • Thingstad, T. Frede; Bratbak, Gunnar. 2016. Microbial Oceanography. Viral strategies at sea. Nature. 531: 454-455. doi: 10.1038/nature17303
  • Bratbak, Gunnar. 2015. On the progress of understanding algal viruses. Perspectives in Phycology. 2: 65-67. doi: 10.1127/pip/2015/0035
  • 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). Genome Announcements. 3: 1-2. doi: 10.1128/genomeA.01413-15
  • 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. 476: 180-188. doi: 10.1016/j.virol.2014.12.014
  • 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. 60: 360-374. doi: 10.1002/lno.10025
  • Pagarete, António; Grébert, Théophile; Stepanova, Olga; Sandaa, Ruth-Anne; Bratbak, Gunnar. 2015. Tsv-N1: A novel DNA algal virus that infects tetraselmis striata. Viruses. 7: 3937-3953. doi: 10.3390/v7072806
  • Carreira, Cátia; Heldal, Mikal; Bratbak, Gunnar. 2013. Effect of increased pCO(2) on phytoplankton-virus interactions. Biogeochemistry. 114: 391-397. doi: 10.1007/s10533-011-9692-x
  • 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. 8. 11 pages. doi: 10.1371/journal.pone.0060223
  • 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. 56: 60-66. doi: 10.1159/000341611
  • 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. 6: 524-530. doi: 10.1038/ismej.2011.130
  • Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin; Thingstad, Tron Frede; Bratbak, Gunnar. 2012. An unaccounted fraction of marine biogenic CaCO3 particles. PLoS ONE. 7. 6 pages. doi: 10.1371/journal.pone.0047887
  • Allen, Michael J; Lanzén, Anders; Bratbak, Gunnar. 2011. Characterisation of the coccolithovirus intein. Marine Genomics. 4: 1-7. doi: 10.1016/j.margen.2010.11.001
  • 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. 31: 1500-1514. doi: 10.1016/j.csr.2011.06.014
  • 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. 27: 107-120. doi: 10.1007/s10453-010-9181-z
  • 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. 30: 89-95. doi: 10.1007/s13131-011-0138-z
  • 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. 5: 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. 5: 1143-1151. doi: 10.1038/ismej.2010.210
  • 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. 2: 575-578. doi: 10.1038/ismej.2008.31
  • 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. 74: 3048-3057. doi: 10.7128/AEM.02548-07
  • 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. 5: 523-533.
  • 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. 5. 8 pages. doi: 10.1186/1743-422X-5-12
  • 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. 455: 387-391. Published 2008-09-18. doi: 10.1038/nature07235
  • Brussaard, Corina P.D.; Bratbak, Gunnar; Baudoux, Anne-Claire; Ruardij, Piet. 2007. Phaeocystis and its interaction with viruses. Biogeochemistry. 83: 201-215. doi: 10.1007/s10533-007-9096-0
  • 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. 73: 554-562. doi: 10.1128/AEM.00864-06
  • 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. 28: 783-791. doi: 10.1093/plankt/fbl010
  • 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. 79: 9236-9243.
  • 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. 319: 280-291.
  • Landa, Harald; Bratbak, Gunnar; Heldal, Mikal. 2004. Abundance and dynamics of free flagellate scales in marine costal ecosystems. Aquatic Microbial Ecology. 37: 55-62.
  • 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. 49: 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. 49: 180-190.
  • Jacquet, Stephan; Bratbak, Gunnar. 2003. Effects of ultraviolet radiation on marine virus–phytoplankton interactions. FEMS Microbiology Ecology. 44: 279-289.
  • Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Bratbak, Gunnar. 2003. Virioplankton community structure along a salinity gradient in a solar saltern. Extremophiles. 7: 347-351.
  • Thyrhaug, Runar; Larsen, Aud; Thingstad, Tron Frede; Bratbak, Gunnar. 2003. Stable coexistence in marine algal host-virus systems. Marine Ecology Progress Series. 254: 27-35.
  • 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. 38: 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. 27: 110-124.
  • Thyrhaug, Runar; Larsen, Aud; Brussaard, Corina P.D.; Bratbak, Gunnar. 2002. Cell cycle dependent virus production in marine phytoplankton. Journal of Phycology. 38: 338-343.
  • 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. 68: 2965-2971.
  • Brussaard, Corina P.D.; Marie, Dominique; Thyrhaug, Runar; Bratbak, Gunnar. 2001. Flow cytometric analysis of phytoplankton viability following viral infection. Aquatic Microbial Ecology. 26: 157-166.
  • 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. 221: 39-46.
  • 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. 25: 1-10.
  • 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. 221: 47-57.
  • 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. 290: 272-280.
  • Bratbak, Gunnar; Heldal, Mikal. 2000. Virus rule the waves - the smallest and most abundant members of marine ecosystems. Microbiology Today. 27: 171-173.
  • Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar. 2000. Flow cytometric detection of viruses. Journal of Virological Methods. 85: 175-182.
  • 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.; 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. 35: 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. 65: 45-52.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal. 1998. Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 16: 11-16.
  • Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal. 1998. Viral lysis of Phaeocystis pouchetii and bacterial secondary production. Aquatic Microbial Ecology. 16: 11-16. Published 1998-10-15.
  • 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. 16: 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. 16: 1-9. Published 1998-10-15.
  • 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. 43: 1389-1393.
  • Oren, Aharon; Bratbak, Gunnar; Heldal, Mikal. 1997. Occurrence of virus-like particles in the Dead Sea. Extremophies. 1: 143-149.
  • Tuomi, P.; Torsvik, Terje; Heldal, Mikal; Bratbak, Gunnar. 1997. Bacterial population dynamics in a meromictic lake. Applied and Environmental Microbiology. 63: 2181-2188.
  • Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede; Tuomi, Pirjo. 1996. Dynamics of virus abundance in coastal seawater. FEMS Microbiology Ecology. 19: 263-269.
  • Bratbak, Gunnar; Willson, William; Heldal, Mikal. 1996. Viral control of Emiliania huxleyi blooms? Journal of Marine Systems. 9: 75-81.
  • Gundersen, Kjell; Bratbak, Gunnar; Heldal, Mikal. 1996. Factors influencing the loss of bacteria in preserved seawater samples. Marine Ecology Progress Series. 137: 305-310. Published 1996-06-27.
  • 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. 33: 3-9.
  • Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal. 1996. Isolation and characterisation of a virus infecting Phaeocystis pouchetii (Haptophyceae). Journal of Phycology. 32: 923-927.
  • Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal. 1996. Isolation and characterization of a virus infecting Phaeocystis pouchetii (Prymnesiophyceae). Journal of Phycology. 32: 923-927.
  • 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. 128: 133-142.
  • 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. 128: 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. 16: 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 alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. Marine Ecology Progress Series. 93: 39-48.
  • 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. 93: 39-48.
  • Thingstad, Tron Frede; Heldal, Mikal; Bratbak, Gunnar; Dundas, Ingrid. 1993. Are viruses important partners in pelagic food webs? Trends in Ecology & Evolution. 8: 209-213.
  • 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.. 83: 273-280.
  • Dundas, Ingrid; Bratbak, Gunnar; Heldal, Mikal. 1992. Roles of virus/phage in marine microbial ECOSYSTEMS. Short Communications of the 1991 International Biotechnology Conferense. 1: 146-150.
  • Heldal, Mikal; Bratbak, Gunnar. 1991. Production and decay of viruses in aquatic environments. Marine Ecology Progress Series. 72: 205-212.
  • Bratbak, Gunnar. 1990. Virus: Spiller de noen økologisk rolle? Naturen. 4: 148-152.
  • Bratbak, Gunnar; Heldal, Mikal; Norland, Svein; Thingstad, Tron Frede. 1990. Viruses as Partners in Spring Bloom Microbial Trophodynamics. Applied and Environmental Microbiology. 1400-1405.
  • 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. 56: 352-356.
  • Bergh, Ø; Børsheim, K. Y.; Bratbak, Gunnar; Heldal, Mikal. 1989. High abundance of viruses found in aquatic environments. Nature. 340: 467-468.
Reports and theses
  • Bratbak, Gunnar. 2001. BIO 101 Basal Biologi Laboratorieøvelser i Cellebiologi. Institutt for mikrobiologi, Bergen. 102 pages.
  • Bratbak, Gunnar; et al., [Mangler fornavn]. 1998. Algal Virus Workshop : Abstracts - Program - Participiants : Bergen, Norway June 14 - 18, 1998. Department of Microbiology, University of Bergen. 27 pages.
  • Bratbak, Gunnar; Heldal, Mikal. 1997. Program and group reports from course in Microbial activity and diversity in aquatic interphases. Institutt for mikrobiologi, Universitetet i Bergen.
  • Bratbak, Gunnar. 1996. Abstracts - Program - Participants. Fifth European Marine Microbiology Symposium. Institutt for mikrobiologi, UiB.
  • Bratbak, Gunnar. 1988. Production, amount and fate of bacterial biomass in marine waters : a discussion of field methods and results in a laboratory perspective.
Book sections
  • Thingstad, T. Frede; Bratbak, Gunnar; Heldal, Mikal. 2008. Aquatic phage ecology. Kapittel. In:
    • Abedon, Stephen T. 2008. Bacteriphage ecology - population growth, evolution, and impact of bacterial viruses. Advances in molecular and cellular microbiology No. 15. Cambridge University Press. 526 pages. ISBN: 9780521858458.
  • Heldal, Mikal; Bratbak, Gunnar; Erichsen, Egil S.; Norland, Svein. 2003. X-ray microanalysis of native aquatic bacteria. 836-842. In:
    • Mendes-Vilas, A. 2003. Science, Technology and Education of Microscopy; an Overview.
  • Bratbak, Gunnar. 1993. Microscope methods for measuring bacterial biovolume: epifluorescence microscopy, scanning electron microscopy and transmission electron microscopy. In:
    • [Mangler etternavn], [Mangler fornavn]. 1993. Handbook of methods in aquatic microbial ecology. (Red.: Kemp, P. F., Sherr, B. F., Sherr, E. B., Cole, J. J.).
  • Bratbak, Gunnar; Heldal, Mikal. 1993. Total Counts of Viruses in Aquatic Environments. In:
    • [Mangler etternavn], [Mangler fornavn]. 1993. Handbook of methods in Aquatic Microbial ecology. (Red.: Kemp, P. F., Sherr, B. F., Sherr, E. B., Cole, J. J.).

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