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 in the ocean.

Academic article

• Boulton, William; Salamov, A; Grigoriev, Igor V. et al. (2025). Metagenome-assembled-genomes recovered from the Arctic drift expedition MOSAiC. (external link)
• Ingvaldsen, Randi Brunvær; Bratbak, Gunnar; Planque, Benjamin et al. (2025). Food web structure, functions, drivers, and dynamics in the Barents Sea and adjacent seas. (external link)
• Kohlbach, Doreen; Fransson, Agneta; Amargant-Arumi, Martί et al. (2025). Nansen and Amundsen basins: Gradients of physico-chemical properties and biota composition with implications for future resource management of the central Arctic Ocean. (external link)
• Hoppe, Clara J. M.; Fuchs, Niels; Notz, Dirk et al. (2024). Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae. (external link)
• Fong, Allison A.; Hoppe, Clara J. M.; Aberle-Malzahn, Nicole et al. (2024). Overview of the MOSAiC expedition: Ecosystem. (external link)
• Amargant I Arumi, Marti; Müller, Oliver; Bodur, Yasemin Vicdan et al. (2023). Mellomårlige forskjeller i havisregime i det nordvestlige Barentshavet forårsaker store endringer i den pelagiske produksjonen og eksportmekanismene om sommeren. (external link)
• Landor, Lotta Anni Ingeborg; Bratbak, Gunnar; Larsen, Aud et al. (2023). Differential toxicity of bioorthogonal non-canonical amino acids (BONCAT) in Escherichia coli. (external link)
• Kohlbach, Doreen; Goraguer, Lucie; Bodur, Yasemin V. et al. (2023). Tidligere havissmelting forlenger den oligotrofe sommerperioden i Barentshavet med lav algebiomasse og vertikal fluks. (external link)
• Thiele, Stefan; Vader, Anna; Thomson, Stuart et al. (2023). Seasonality of the bacterial and archaeal community composition of the Northern Barents Sea. (external link)
• Thiele, Stefan; Vader, Anna; Thomson, Stuart et al. (2023). The summer bacterial and archaeal community composition of the northern Barents Sea. (external link)
• Mock, Thomas; Boulton, William; Balmonte, John-Paul et al. (2022). Multiomics in the central Arctic Ocean for benchmarking biodiversity change. (external link)
• Kauko, Hanna Maria; Assmy, Philipp; Peeken, Ilka et al. (2022). First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn. (external link)
• Lindivat, Mathilde; Bratbak, Gunnar; Larsen, Aud et al. (2021). Flow Cytometric Analysis of Bacterial Protein Synthesis: Monitoring Vitality After Water Treatment. (external link)
• Müller, Oliver; Seuthe, Lena; Pree, Bernadette et al. (2021). How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments. (external link)
• Kauko, Hanna Maria; Hattermann, Tore; Ryan-Keogh, Thomas J. et al. (2021). Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean. (external link)
• Egge, Elianne Dunthorn; Elferink, Stephanie; Vaulot, Daniel et al. (2021). An 18S V4 rDNA metabarcoding dataset of protist diversity in the Atlantic inflow to the Arctic Ocean, through the year and down to 1000 m depth. (external link)
• Mayers, Kyle; Lawrence, Janice; Skaar, Katrine Sandnes et al. (2021). Removal of large viruses and their dispersal through fecal pellets of the appendicularian Oikopleura dioica during Emiliania huxleyi bloom conditions. (external link)
• Lindivat, Mathilde; Larsen, Aud; Hess-Erga, Ole Kristian et al. (2020). Bioorthogonal Non-canonical Amino Acid Tagging Combined With Flow Cytometry for Determination of Activity in Aquatic Microorganisms. (external link)
• Rozenberg, A.; Opperman, J.; Wietek, J. et al. (2020). Lateral gene transfer of anion-conducting channelrhodopsins between green algae and giant viruses. (external link)
• Thingstad, T. Frede; Våge, Selina; Bratbak, Gunnar et al. (2020). Reproducing the virus-to-copepod link in Arctic mesocosms using host fitness optimization.. (external link)
• Müller, Oliver; Seuthe, Lena; Bratbak, Gunnar et al. (2018). Bacterial response to permafrost derived organic matter input in an Arctic fjord. (external link)
• Sandaa, Ruth-Anne; Bratbak, Gunnar (2018). Is the virus important? And some other questions. (external link)
• Tsagaraki, Tatiana Margo; Pree, Bernadette; Leiknes, Øystein et al. (2018). Bacterial community composition responds to changes in copepod abundance and alters ecosystem function in an Arctic mesocosm study. (external link)
• Sandaa, Ruth-Anne; Storesund, Julia Endresen; Olesin, Emily Maria et al. (2018). Seasonality drives microbial community structure, shaping both eukaryotic and prokaryotic host–viral relationships in an Arctic marine ecosystem. (external link)
• Paulino, Ana; Larsen, Aud; Bratbak, Gunnar et al. (2018). Seasonal and annual variability in the phytoplankton community of the Raunefjord, west coast of Norway from 2001-2006. (external link)
• Randelhoff, Achim; Reigstad, Marit; Chierici, Melissa et al. (2018). Seasonality of the physical and biogeochemical hydrography in the inflow to the Arctic Ocean through Fram Strait. (external link)
• Müller, Oliver; Wilson, Bryan; Paulsen, Maria Lund et al. (2018). Spatiotemporal dynamics of ammonia-oxidizing Thaumarchaeota in Distinct Arctic water masses. (external link)
• Lawrence, Janice; Töpper, Joachim Paul; Petelenz-Kurdziel, Elzbieta Anna et al. (2017). Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. (external link)
• Lawrence, Janice; Töpper, Joachim Paul; Petelenz-Kurdziel, Elzbieta Anna et al. (2017). Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater. (external link)
• Pree, Bernadette; Larsen, Aud; Egge, Jorun Karin et al. (2017). Dampened copepod-mediated trophic cascades in a microzooplankton-dominated microbial food web: A mesocosm study. (external link)
• Johannessen, Torill Vik; Larsen, Aud; Bratbak, Gunnar et al. (2017). Seasonal dynamics of haptophytes and dsDNA algal viruses suggest complex virus-host relationship. (external link)
• Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena et al. (2017). Changes in marine prokaryote composition with season and depth over an Arctic polar year. (external link)
• Erga, Svein Rune; Haugen, Stig Bjarte; Bratbak, Gunnar et al. (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. (external link)
• Šantl-Temkiv, Tina; Amato, Pierre; Gosewinkel, Ulrich et al. (2017). High-Flow-Rate Impinger for the Study of Concentration, Viability, Metabolic Activity, and Ice-Nucleation Activity of Airborne Bacteria. (external link)
• Paulsen, Maria Lund; Doré, Hugo; Garczarek, Laurence et al. (2016). Synechococcus in the Atlantic Gateway to the Arctic Ocean. (external link)
• Johannessen, Torill Vik; Bratbak, Gunnar; Larsen, Aud et al. (2015). Characterisation of three novel giant viruses reveals huge diversity among viruses infecting Prymnesiales (Haptophyta). (external link)
• Larsen, Aud; Egge, Jorun Karin; Nejstgaard, Jens Christian et al. (2015). Contrasting response to nutrient manipulation in Arctic mesocosms are reproduced by a minimum microbial food web model. (external link)
• Bratbak, Gunnar (2015). On the progress of understanding algal viruses.. (external link)
• Pagarete, António; Grébert, Théophile; Stepanova, Olga et al. (2015). Tsv-N1: A novel DNA algal virus that infects tetraselmis striata. (external link)
• Carreira, Cátia; Heldal, Mikal; Bratbak, Gunnar (2013). Effect of increased pCO(2) on phytoplankton-virus interactions. (external link)
• Medina-Sánchez, Juan Manuel; Delgado-Molina, José Antonio; Bratbak, Gunnar et al. (2013). Maximum in the middle : nonlinear response of microbial plankton to ultraviolet radiation and phosphorus. (external link)
• Pagarete, Antonio; Lanzén, Anders; Puntervoll, Pål et al. (2013). Genomic sequence and analysis of EhV-99B1, a new coccolithovirus from the Norwegian fjords. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2012). Mg2+ as an indicator of nutritional status in marine bacteria. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2012). An unaccounted fraction of marine biogenic CaCO3 particles. (external link)
• Ogata, Hiroyuki; Ray, Jessica Louise; Toyoda, Kensuke et al. (2011). Two new subfamilies of DNA mismatch repair proteins (MutS) specifically abundant in the marine environment. (external link)
• Bratbak, Gunnar; Jacquet, Stephan; Larsen, Aud et al. (2011). The plankton community in Norwegian coastal waters-abundance, composition, spatial distribution and diel variation. (external link)
• Liu, JingWen; Zheng, Tianling; Bratbak, Gunnar et al. (2011). Virus infection disturbs cyclin expression, leading to cell cycle arrest in the unicellular marine algae Emiliania huxleyi and Chrysochromulina ericina. (external link)
• Fahlgren, C; Bratbak, Gunnar; Sandaa, Ruth-Anne et al. (2011). Diversity of airborne bacteria in samples collected using different devices for aerosol collection. (external link)
• Allen, Michael J; Lanzén, Anders; Bratbak, Gunnar (2011). Characterisation of the coccolithovirus intein. (external link)
• Liu, JingWen; Bratbak, Gunnar; Zheng, Tian Ling et al. (2011). Effects of virus infection on expression of cell cycle regulatory proteins in the unicellular marine algae Emiliania huxleyi. (external link)
• Larsen, Jens Borggaard; Larsen, Aud; Bratbak, Gunnar et al. (2008). Phylogenetic analysis of members of the Phycodnaviridae virus family, using amplified fragments of the major capsid protein gene. (external link)
• Monier, Adam; Larsen, Jens Borggaard; Sandaa, Ruth-Anne et al. (2008). Marine mimivirus relatives are probably large algal viruses. (external link)
• Thingstad, T. Frede; Bellerby, Richard; Bratbak, Gunnar et al. (2008). Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. (external link)
• Larsen, Jens Borggaard; Larsen, Aud; Thyrhaug, Runar et al. (2008). Response of marine viral populations to a nutrient induced phytoplankton bloom at different pCO2 levels. (external link)
• Martinez, Joaquín Martínez; Schroeder, Declan C.; Larsen, Aud et al. (2007). Molecular dynamics of Emiliania huxleyi and cooccurring viruses during two separate mesocosm studies. (external link)
• Brussaard, Corina P.D.; Bratbak, Gunnar; Baudoux, Anne-Claire et al. (2007). Phaeocystis and its interaction with viruses. (external link)
• Martínez-Martínez, Joaquin; Norland, Svein; Thingstad, Tron Frede et al. (2006). Variability in microbial population dynamics between similarly perturbed mesocosms. (external link)
• Yan, XD; Chipman, PR; Castberg, T et al. (2005). The marine algal virus PpV01 has an icosahedral capsid with T=219 quasisymmetry. (external link)
• Brussaard, Corina P.D.; Noordeloos, A.A.M.; Sandaa, Ruth-Anne et al. (2004). Discovery of a dsRNA virus infecting the marine photosynthetic protist Micromonas pusilla. (external link)
• Landa, Harald; Bratbak, Gunnar; Heldal, Mikal (2004). Abundance and dynamics of free flagellate scales in marine costal ecosystems. (external link)
• Larsen, Aud; Flaten, Gro Anita Fonnes; Sandaa, Ruth-Anne et al. (2004). Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. (external link)
• Larsen, Aud; Flaten, Gro Anita Fonnes; Sandaa, Ruth-Anne et al. (2004). Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity. (external link)
• Thyrhaug, Runar; Larsen, Aud; Thingstad, Tron Frede et al. (2003). Stable coexistence in marine algal host-virus systems. (external link)
• Jacquet, Stephan; Bratbak, Gunnar (2003). Effects of ultraviolet radiation on marine virus–phytoplankton interactions. (external link)
• Sandaa, Ruth-Anne; Skjoldal, Evy Foss; Bratbak, Gunnar (2003). Virioplankton community structure along a salinity gradient in a solar saltern. (external link)
• Castberg, Tonje; Thyrhaug, Runar; Larsen, Aud et al. (2002). Isolation and characterization of a virus that infects Emiliania huxleyi (Haptophyceae). (external link)
• Vrede, Katarina; Heldal, Mikal; Norland, Svein et al. (2002). Elemental composition (C,N,P)and cell volume of exponentially growing and nutrient limited bacterioplankton. (external link)
• Thyrhaug, Runar; Larsen, Aud; Brussaard, Corina P.D. et al. (2002). Cell cycle dependent virus production in marine phytoplankton. (external link)
• Jacquet, Stephan; Heldal, Mikal; Iglesias-Rodriguez, Debora et al. (2002). Flow cytometric Analysis of an E. Huxleyi bloom terminated by viral infection. (external link)
• Brussaard, Corina P.D.; Marie, Dominique; Thyrhaug, Runar et al. (2001). Flow cytometric analysis of phytoplankton viability following viral infection. (external link)
• Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje et al. (2001). Isolation and characterization of two viruses with large genome size infecting Chrysochromulina ericina (Prymneriophyceae) and Pyramimonas orientalis (Prasinophyceae). (external link)
• Hewson, Ian; O'Neil, Judit M; Heil, Cynthia A et al. (2001). Effects of concentrated viral communities on photosynthesis and community composition of cooccurring benthic microalgae and phytoplankton. (external link)
• Castberg, Tonje; Larsen, Aud; Sandaa, Ruth-Anne et al. (2001). Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta). (external link)
• Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne et al. (2001). Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. (external link)
• Rodriguez, F.; Fernandez, E.; Head, R.N. et al. (2000). Temporal variability of viruses, bacteria, phytoplankton and zooplankton in the western English Channel off Plymouth. (external link)
• Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar (2000). Flow cytometric detection of viruses. (external link)
• Bratbak, Gunnar; Heldal, Mikal (2000). Virus rule the waves - the smallest and most abundant members of marine ecosystems. (external link)
• Marie, Dominique; Brussaard, Corina P.D.; Thyrhaug, Runar et al. (1999). Enumeration of Marine Viruses in Culture and Natural Samples by Flow Cytometry. (external link)
• Brussaard, Corina P.D.; Thyrhaug, Runar; Marie, Dominique et al. (1999). Flow cytometric analysis of virus infection in two marine phytoplankton species, Micromonas pusilla (Prasinophyceae) and Phaeocystis pouchetii (Prymnesiophyceae). (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal et al. (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal et al. (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. (external link)
• Malin, G.; Wilson, W.H.; Bratbak, Gunnar et al. (1998). Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>. (external link)
• Oren, Aharon; Bratbak, Gunnar; Heldal, Mikal (1997). Occurrence of virus-like particles in the Dead Sea. (external link)
• Tuomi, P.; Torsvik, Terje; Heldal, Mikal et al. (1997). Bacterial population dynamics in a meromictic lake. (external link)
• Heldal, Mikal; Norland, Svein; Fagerbakke, Kjell Magne et al. (1996). The elemental composition of bacteria: a signature of growth conditions?. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede et al. (1996). Dynamics of virus abundance in coastal seawater. (external link)
• Gundersen, Kjell; Bratbak, Gunnar; Heldal, Mikal (1996). Factors influencing the loss of bacteria in preserved seawater samples. (external link)
• Bratbak, Gunnar; Willson, William; Heldal, Mikal (1996). Viral control of Emiliania huxleyi blooms?. (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation and characterisation of a virus infecting Phaeocystis pouchetii (Haptophyceae). (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation and characterization of a virus infecting Phaeocystis pouchetii (Prymnesiophyceae). (external link)
• Tuomi, Pirjo; Fagerbakke, Kjell Magne; Bratbak, Gunnar et al. (1995). Nutritional enrichment of a microbial community: The effects on activity, elemental composition, community structure and virus production. (external link)
• Bratbak, Gunnar; Levasseur, M.; Michaud, M. et al. (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release?. (external link)
• Bratbak, Gunnar; Levasseur, M.; Michaud, M. et al. (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release?. (external link)
• Heldal, Mikal; Norland, Svein; Bratbak, Gunnar et al. (1994). Determination of bacterial cell number and cell volume by means of flow cytometer, transmission electron microscopy, and epifluorescene microscopy. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1993). Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1993). Viral mortality of the marine algae Emiliania huxleyi (Haptophyceae) and termination of algal blooms. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, T.F et al. (1992). Incorporation of viruses into the budget of microbial C-transfer. A first approach. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1991). Production and decay of viruses in aquatic environments. (external link)
• Børsheim, K. Y.; Bratbak, Gunnar; Heldal, Mikal (1990). Enumeration and biomass estimation on planktonic bacteria and viruses by transmission electron microscopy. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Norland, Svein et al. (1990). Viruses as Partners in Spring Bloom Microbial Trophodynamics. (external link)
• Bratbak, Gunnar (1990). Virus: Spiller de noen økologisk rolle?. (external link)
• Bergh, Ø; Børsheim, K. Y.; Bratbak, Gunnar et al. (1989). High abundance of viruses found in aquatic environments. (external link)
• Bergh, Øivind; Børsheim, Knut Yngve; Bratbak, Gunnar et al. (1989). High abundance of viruses found in aquatic environments. (external link)

Academic lecture

• Müller, Oliver; Gardner, Jessie; Olsen, Lasse et al. (2024). Arctic Sea ice ridges: Complex havens of biodiversity with astonishing community changes from ridge formation to melting and summer consolidation. (external link)
• Fransson, Agneta; Bluhm, Bodil Annikki Ulla Barbro; Kohlbach, Doreen et al. (2024). Nansen vs. Amundsen Basin: Constrasting physico-chemical properties and biota composition to inform management. (external link)
• Bjune, Anne Elisabeth; Bratbak, Gunnar; Eliassen, Sigrunn et al. (2023). Omlegging fra tradisjonelle forelesninger til studentaktiv læring – eksempel fra et grunnemne i biolog. (external link)
• Müller, Oliver; Bratbak, Gunnar; Paulsen, Maria Lund (2023). Increased organic matter input. Testing bacterial responses in Arctic fjords vs Barents Sea. (external link)
• Gradinger, Rolf Rudolf; Amargant I Arumi, Marti; Assmy, Philipp Kurt Wolf et al. (2023). Ranges of Annual Production in the Barents Sea along Environmental Gradients. (external link)
• Saltvedt, Marius Rydningen; Wang, Haina; Dahle, Håkon et al. (2023). PERSISTENT VIRUS PRODUCTION BY PHYTOPLANKTON. (external link)
• Salganik, Evgenii; Müller, Oliver; Olsen, Lasse Mork et al. (2023). Hidden in Plain Sight – New Insights on Arctic Sea-Ice Ridges from the MOSAiC Expedition – an Overview. (external link)
• Müller, Oliver; Gardner, Jessie; Lange, Benjamin et al. (2022). ARCTIC SEA ICE RIDGES – DYNAMIC HOTSPOTS FOR MICROBIAL LIFE. (external link)
• Mayers, Kyle; Lawrence, Janice; Töpper, Joachim Paul et al. (2020). Interactions between the filter-feeding appendicularian Oikopleura dioica and the abundance and fate of marine viruses​. (external link)
• Egge, Elianne Dunthorn; Vaulot, Daniel; Larsen, Aud et al. (2017). Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing.. (external link)
• Tsagaraki, Tatiana; Egge, Jorun Karin; Bratbak, Gunnar et al. (2017). Microbial Food web structure in a changing Arctic.. (external link)
• Paulsen, Maria Lund; Doré, Hugo; Garczarek, Laurence et al. (2017). Synechococcus in the Arctic Ocean. (external link)
• Sandaa, Ruth-Anne; Ray, Jessica Louise; Enoult, Francois et al. (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 . (external link)
• Edvardsen, Bente; Egge, Elianne Dunthorn; Vaulot, Daniel et al. (2017). Protist community structure in Atlantic Arctic through the year as revealed by high throughput sequencing. (external link)
• Ray, Jessica Louise; Enault, François; Johannessen, Torill Vik et al. (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. (external link)
• Ray, Jessica Louise; Johannessen, Torill Vik; Wilson, Brian C. et al. (2016). Development of a semi-automated method for metagenomic characterization of total virus assemblages from seasonal high-latitude seawater samples. (external link)
• Ray, Jessica Louise; Lawrence, Janice; Petelenz-Kurdziel, Elzbieta Anna et al. (2016). Role of appendicularians in aquatic viral ecology: particle trapping, ingestion and consequences for the marine microbial food web. (external link)
• Edvardsen, Bente; Egge, Elianne Sirnæs; Johannessen, Torill Vik et al. (2014). Diversity and seasonal dynamics of marine haptophytes and their viruses. (external link)
• Edvardsen, Bente; Egge, Elianne Sirnæs; Torill Vik, Johannessen et al. (2013). Diversity and dynamics of marine haptophytes and their viruses. (external link)
• Pagarete, Antonio; Puntervoll, Pål; Lanzén, Anders et al. (2011). Geographic segregation and mechanisms of genetic evolution between coccolithovirus populations: a genomic study. (external link)
• Thingstad, T.F.; Bellerby, Richard; Bratbak, Gunnar et al. (2008). Increased level of CO2 in the ecosphere may modify the structure of marine plankton. (external link)
• Thyrhaug, Runar; Einen, Jørn; Sandaa, Ruth-Anne et al. (2007). Total numbers and activity of environmental airborne bacteria. (external link)
• Bratbak, Gunnar (2007). Virus Ecology. (external link)
• Bratbak, Gunnar (2007). Virus in aquatic ecosystems: Who are they and what are they doing?. (external link)
• Bratbak, Gunnar (2006). The global role of viruses in bloom termination, biodiversity and marine ecology. (external link)
• Bratbak, Gunnar (2006). Algal Viruses –a Diverse Group with Ecological Impact. (external link)
• Heldal, Mikal; Norland, Svein; Thingstad, Tron Frede et al. (2005). Single cell analysis: X-ray microanalysis in TEM. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede et al. (2005). Single cell analysis: X-ray microanalysis in TEM. (external link)
• Heldal, Mikal; Norland, Svein; Bratbak, Gunnar et al. (2005). X-ray microanalyses of bacteria at the single cell level: Does elemental composition of cells relate to activity and nutritional status of cells?. (external link)
• Bratbak, Gunnar (2005). An overview of algal viruses. (external link)
• Bratbak, Gunnar (2005). Methods in viral ecology. (external link)
• Sandaa, Ruth-Anne; Bratbak, Gunnar (2004). Viral diversity in solar saltern. (external link)
• Bratbak, Gunnar (2003). Counting and Characterization of Microalgae, Bacteria and Virus in Marine Ecosystems. (external link)
• Bratbak, Gunnar (2003). Vyer for Fremtiden?. (external link)
• Larsen, Aud; Thyrhaug, Runar; Sandaa, Ruth-Anne et al. (2002). Marine phytoplankton viruses - ecology, physiology and host virus interactions. (external link)
• Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne et al. (2002). Marine Phytoplankton Viruses-Ecology, Physiology and Host Virus Interactions. (external link)
• Castberg, Tonje; Bratbak, Gunnar (2002). Large Algal Viruses, Characterization. (external link)
• Bratbak, Gunnar (2002). MICROALGAL VIRUS ECOLOGY. (external link)
• Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar et al. (2000). Is Virus Production in Marine Algae Cell-cycle Dependent?. (external link)
• Bratbak, Gunnar; Brussaard, Corina P. D.; Castberg, Tonje et al. (2000). Diversity and succession of algae, virus and bacteria in nutrient enriched seawater enclosures. (external link)
• Castberg, Tonje; Sandaa, Ruth-Anne; Bratbak, Gunnar (2000). Bacterial population dynamics and diversity after viral lysis of three different algal species. (external link)
• Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje et al. (2000). Isolation and characterization of two marine viruses infecting Chrysochromulina ericina and Pyramimonas orientalis. (external link)
• Castberg, Tonje; Graves, M.V.; Bratbak, Gunnar et al. (2000). Extracellular Release of DNA During High-Dose PBCV-1 Infection of Chlorella. (external link)
• Castberg, Tonje; Bratbak, Gunnar (2000). Bacterial population dynamics and diversity after viral lysis of three different algal species. (external link)
• Sandaa, Ruth-Anne; Larsen, Aud; Castberg, Tonje et al. (2000). Population dynamics in the virioplankton community during marine algal blooms. (external link)
• Brussaard, Corina P.D.; Sandaa, Ruth-Anne; Bratbak, Gunnar (2000). Infection of Micromonas pusilla (Prasinophyceae) by a dsRNA virus. (external link)
• Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar (2000). Virus detection and enumeration using flow cytometry. (external link)
• Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar (2000). Persistent virus infection in marine phytoplankton. (external link)
• Brussaard, Corina P.D.; Bratbak, Gunnar (1999). Viral control of phytoplankton blooms. (external link)
• Bratbak, Gunnar (1999). Phytoplankton Viruses - Ecology And Host Virus Interactions. (external link)
• Bratbak, Gunnar (1999). Algal Viruses - Characterization of new viruses and Quantification by Flow Cytometry and Pulsefield Gelelectrophoresis. (external link)
• Brussaard, Corina P.D.; Marie, Dominique; Bratbak, Gunnar (1999). Flow Cytometric Analysis Of Virus Infected Phytoplankton. (external link)
• Castberg, Tonje; Enger, Øivind; Bratbak, Gunnar (1998). Detection of <EM>Phaeocytus</EM>-virus by PCR. (external link)
• Bratbak, Gunnar (1998). Ecology of algal host-virus interactions. (external link)
• Castberg, Tonje; Bratbak, Gunnar; Enger, Øivind (1998). A PCR approach to specific quantification of <EM>Phaeocytis</EM> virus. (external link)
• Malin, G.; Wilson, W.H.; Bratbak, Gunnar et al. (1998). Elevated production of dimethylsulfide resulting from viral infection of cultures of <EM>Phaeocystis pouchetii</EM>. (external link)
• Castberg, Tonje; Bratbak, Gunnar (1998). Algevirus. (external link)
• Heldal, Mikal; Tuomi, P.; Norland, Svein et al. (1998). Isolates of marine bacteria: elemental content relates to growth conditions [poster]. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1998). Ecology of <EM>Phaeocystis</EM> host-virus interactions. (external link)
• Brussard, Corina; Marie, Dominique; Thyrhaug, Runar et al. (1998). Characterization of virus infected phytoplankton cells by FCN. (external link)
• Marie, Dominique; Brussard, Corina; Thyrhaug, Runar et al. (1998). Enumeration of viruses in marine samples by flow cytometry [poster]. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1998). Ecology of Phaeocystis host-virus interactions. (external link)
• Flaten, Gro Anita Fonnes; Thingstad, T. Frede; Bratbak, Gunnar (1998). Bacterial activity measured by different single-cell methods. (external link)
• Thingstad, Tron Frede; Bratbak, Gunnar; Heldal, Mikal et al. (1997). Trophic interactions controlling the diversity in pelagic microbial food webs. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Utkilen, H. et al. (1997). Viral impact on algal blooms. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede (1997). The marine microbial ecology revised. (external link)
• Bratbak, Gunnar; Øvreås, Lise; Thingstad, Tron Frede (1997). Hutchinson's paradox reversed? Is the bacterioplankton diversity lower than predicted by steady state models?. (external link)
• Nagasaki, Keizo; Wilson, William; Heldal, Mikal et al. (1996). Preliminary analysis of structural proteins and DNA of PpV-1, a large dsDNA virus which is infectious to Phaeocystis pouchetii. (external link)
• Guixa-Boixareu, Núria; Calderón-Paz, Juan; Heldal, Mikal et al. (1996). Viral lysis and bacterivory as prokaryotic loss factors along a salinity gradient. (external link)
• Tuomi, Pirjo; Torsvik, Terje; Heldal, Mikal et al. (1996). Bacterial population dynamics in a meromictic lake Sælenvatnet. (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation of a virus infecting Phaeocystis pouchetii (Haptophyceae). (external link)
• Wilson, William; Mallin, Gillian; Bratbak, Gunnar et al. (1996). Oceanic Dimethyl sulphide: Elevated Production During Virus Infection of Phaeocystis pouchetii (Hariot) Lagerheim. (external link)
• Norland, Svein; Mikal, Heldal; Bratbak, Gunnar et al. (1995). Analytical use of Transmission Electron Microscope (TEM) in aquatic microbial ecology. (external link)
• Norland, Svein; Bratbak, Gunnar; Fagerbakke, Kjell Magne et al. (1995). Quantitative analysis of carbon, nitrogen, oxygen and phosphorous in single bacteria by use of X-ray - TEM. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1995). Algevirus - kontrollerer de oppblomstringer?. (external link)
• Bratbak, Gunnar; Thingstad, Tron Frede; Heldal, Mikal (1993). Virus and the Microbial Loop, Paradigms and Paradoxes in the microbial loop. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1993). Decay and fate of aquatic viruses. (external link)

Poster

• Amargant I Arumi, Marti; Müller, Oliver; Bodur, Yasemin Vicdan et al. (2023). Lower trophic level carbon fluxes in two summers of contrasting ice conditions. (external link)
• Olsen, Lasse Mork; Müller, Oliver; Bratbak, Gunnar et al. (2022). The working of the microbial food web inside sea ice ridges vs. the water column in winter and summer in the Arctic Ocean. (external link)
• Saltvedt, Marius Rydningen; Wang, Haina; Lawrence, Janice et al. (2022). Friend or enemy: The story of a frenemy relationship between a virus and its host. (external link)
• Mork Olsen, Lasse; Müller, Oliver; Thingstad, T. Frede et al. (2022). How carbon flow is controlled by microbial predator-prey interactions along a productivity gradient in the Barents Sea. (external link)
• Müller, Oliver; Paulsen, Maria Lund; Seuthe, Lena et al. (2019). Biological drivers of bacterial communities in the Arctic water inflow region . (external link)
• Mayers, Kyle; Lawrence, Janice; Töpper, Joachim Paul et al. (2019). Trophic interactions between filter-feeding mesozooplankton and the Emiliania huxleyi virus. (external link)
• Lindivat, Mathilde; Larsen, Aud; Bratbak, Gunnar et al. (2018). Bacterial Viability and Vitality: Application of Click Chemistry in Flow Cytometry. (external link)
• Müller, Oliver; Øvreås, Lise; Bratbak, Gunnar et al. (2017). How permafrost organic matter input in an Arctic fjord alters the bacterial community structure. (external link)
• Sandaa, Ruth-Anne; Ray, Jessica Louise; Storesund, Julia Endresen et al. (2016). Marine viral diversity in the Arctic - from surface to deep waters through the long polar night and day.. (external link)
• Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena et al. (2016). A year in the microbial life of a changing Arctic Ocean. (external link)
• Norland, Svein; Bratbak, Gunnar; Thingstad, Tron Frede et al. (2005). Bacterial physiology at the single cell level: do elemental composition reveals any signatures related to growth, dormancy or death?. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2005). Mg2+ plays an important role in marine bacteria. (external link)
• Larsen, Aud; Flaten, Gro Anita Fonnes; Thyrhaug, Runar et al. (2003). Dynamics and succession during the spring bloom in the Norwegian coastal current, with emphasis on the smallest participants. (external link)
• 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. (external link)
• Larsen, Aud; Flaten, Gro Anita Fonnes; Thyrhaug, Runar et al. (2001). Dynamics and succession during the spring bloom in Norwegian coastal current, with emphasis on the smallest participants. (external link)
• Yan, X.; Chipman, P.; Castberg, Tonje et al. (2001). The Structure of PpV01, a Marine Algal Virus With a T=219 Capsid. (external link)
• Larsen, Aud; Thyrhaug, Runar; Bratbak, Gunnar (2000). Vedvarende virusinfeksjon i marint fytoplankton. (external link)
• Sandaa, Ruth-Anne; Bratbak, Gunnar (2000). A method for diversity analysis of viruses in small volumes of seawater. (external link)
• Bratbak, Gunnar; Brussaard, Corina; Castberg, Tonje et al. (1999). Virus i Havet. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1995). Viral control of algal blooms?. (external link)
• Heldal, Mikal; Tuomi, Pirjo; Fagerbakke, Kjell Magne et al. (1995). Detection of polyphosphate bodies in bacteria: fluorescens microscopy and X-ray microanalysis. (external link)

Academic literature review

• Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Reigstad, Marit et al. (2023). Still Arctic? — The changing Barents Sea. (external link)
• Våge, Selina; Bratbak, Gunnar; Egge, Jorun Karin et al. (2018). Simple models combining competition, defence and resource availability have broad implications in pelagic microbial food webs. (external link)

Lecture

• Saltvedt, Marius Rydningen; Lawrence, Janice; Wang, Haina et al. (2021). Vital and all over the place – A neglected group of frenemy viruses. (external link)
• Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena et al. (2017). A year in the microbial life of a changing Arctic Ocean. (external link)
• Thyrhaug, Runar; Larsen, Aud; Bratbak, Gunnar et al. (2010). Use of flow cytometry in air and marine microbiological research. (external link)

Report

• Ingvaldsen, Randi Brunvær; Bluhm, Bodil; Aberle-Malzahn, Nicole et al. (2020). Joint Cruise 1-2 2018: Cruise Report . (external link)
• Bratbak, Gunnar; et al., [Mangler fornavn] (1998). Algal Virus Workshop : Abstracts - Program - Participiants : Bergen, Norway June 14 - 18, 1998. (external link)
• Bratbak, Gunnar (1996). Abstracts - Program - Participants. Fifth European Marine Microbiology Symposium. (external link)

Documentary

• Bratbak, Gunnar (2018). Samler alger, bakterier og virus. Blogg: Arven etter Nansen. (external link)

Doctoral dissertation

• Paulsen, Maria Lund; Larsen, Aud; Bratbak, Gunnar et al. (2017). Microbial dynamics in high latitude ecosystems. Responses to mixing, runoff and seasonal variation a rapidly changing environment. (external link)
• Bratbak, Gunnar (1988). Production, amount and fate of bacterial biomass in marine waters : a discussion of field methods and results in a laboratory perspective. (external link)

Book review

• Thingstad, T. Frede; Bratbak, Gunnar (2016). Microbial Oceanography. Viral strategies at sea. (external link)

Short communication

• Gallot-lavallée, Lucie; Pagarete, António; Legendre, Matthieu et al. (2015). The 474-kilobase-pair complete genome sequence of CeV-01B, a virus infecting Haptolina (Chrysochromulina) ericina (Prymnesiophyceae). (external link)

Editorial

• Brussaard, Corina P.D.; Wilhelm, Steven W.; Thingstad, T. Frede et al. (2008). Global-scale processes with a nanoscale drive: the role of marine viruses. (external link)

Academic chapter/article/Conference paper

• Thingstad, T. Frede; Bratbak, Gunnar; Heldal, Mikal (2008). Aquatic phage ecology. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Erichsen, Egil S. et al. (2003). X-ray microanalysis of native aquatic bacteria. (external link)
• Bratbak, Gunnar (1993). Microscope methods for measuring bacterial biovolume: epifluorescence microscopy, scanning electron microscopy and transmission electron microscopy. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1993). Total Counts of Viruses in Aquatic Environments. (external link)

Interview

• Bratbak, Gunnar; Finstad, Hanne S. (2002). En Munnfull Virus. (external link)
• Bratbak, Gunnar; Eliassen, Haakon E.H. (2001). Strålende våpen avliver dødsalger. (external link)
• Bratbak, Gunnar; Orvik, Ronny (2001). Stråler algene til døde. (external link)

Compendium

• Bratbak, Gunnar (2001). BIO 101 Basal Biologi Laboratorieøvelser i Cellebiologi. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1997). Program and group reports from course in Microbial activity and diversity in aquatic interphases. (external link)

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?. (external link)

Popular scientific lecture

• Bratbak, Gunnar (1994). Oppdagelsen av marine virus. (external link)
• Bratbak, Gunnar (1994). The ecological role of virus. (external link)
• Bratbak, Gunnar (1994). Virus i vann. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede (1994). The possible impact of viruses on marine food webs. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1994). Viruses - the new players in the game.... (external link)
• Bratbak, Gunnar; Heldal, Mikal (1994). Virus og bakterier sin økologiske rolle i akvatiske miljøer. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1993). Carbon budget in the microbial/viral loop. (external link)

See a complete overview of publications in Cristin.

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

2020-24          CoPI: AQUACOSM-plus - Network of Leading Ecosystem Scale Experimental AQUAtic MesoCOSM Facilities Connecting Rivers, Lakes, Estuaries and Oceans in Europe and beyond

2019-23          CoPI: SIMPLEX - Exploring fractality in ecosystem organization – Developing scale-invariant theory for biodiversity and complexity based on simple laws of ecology.

2019-23          CoPI: VirVar - Uncovering key players for regulation of phytoplankton function and structure: lessons to be learned from algal virus-haptophyte coexistence.

2019-22          CoPI: Ridges - Safe Havens for ice-associated Flora and Fauna in a Seasonally ice-covered Arctic Ocean.

2018-23          Partner: The Nansen Legacy - scientific exploration and sustainable management beyond the ice edge.

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

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

2016-20          CoPI: Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean - AQUACOSM (H2020-INFRAIA, ca 770 to UIB).