World's Best Scientists 2026 revealed!
Gunnar Bratbak

Gunnar Bratbak

D-Index & Metrics

Microbiology

D-Index
55
Citations
15318
World Ranking
3772
National Ranking
14

Gunnar Bratbak publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Gunnar Bratbak sits on this spectrum.

55–64 publications: 8 scientists 65–74 publications: 29 scientists 75–84 publications: 55 scientists 85–94 publications: 112 scientists 95–104 publications: 137 scientists 105–114 publications: 190 scientists 115–124 publications: 235 scientists 125–134 publications: 234 scientists 135–144 publications: 288 scientists 145–154 publications: 264 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 233 scientists 205–214 publications: 207 scientists 215–224 publications: 198 scientists 225–234 publications: 155 scientists 235–244 publications: 161 scientists 245–254 publications: 160 scientists 255–264 publications: 146 scientists 265–274 publications: 139 scientists 275–284 publications: 148 scientists 285–294 publications: 115 scientists 295–304 publications: 96 scientists 305–314 publications: 88 scientists 315–324 publications: 106 scientists 325–334 publications: 65 scientists 335–344 publications: 76 scientists 345–354 publications: 64 scientists 355–364 publications: 62 scientists 365–374 publications: 65 scientists 375–384 publications: 61 scientists 385–394 publications: 34 scientists 395–404 publications: 44 scientists 405–414 publications: 36 scientists 415–424 publications: 35 scientists 425–434 publications: 29 scientists 435–444 publications: 33 scientists 445–454 publications: 34 scientists 455–464 publications: 25 scientists 465–474 publications: 26 scientists 475–484 publications: 20 scientists 485–494 publications: 19 scientists 495–504 publications: 16 scientists 505–514 publications: 17 scientists 515–524 publications: 23 scientists 525–534 publications: 14 scientists 535–544 publications: 14 scientists 545–554 publications: 18 scientists 555–564 publications: 12 scientists 565–574 publications: 7 scientists 575–584 publications: 9 scientists 585–594 publications: 9 scientists 595–604 publications: 9 scientists 605–614 publications: 7 scientists 615–624 publications: 9 scientists 625–634 publications: 7 scientists 635–644 publications: 4 scientists 645–654 publications: 5 scientists 655–664 publications: 6 scientists 665–674 publications: 7 scientists 675–678 publications: 3 scientists 679+ publications: 99 scientists
55 publications 679+

This scientist: 111 publications — 8th percentile

8% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 679 publications or more.

Gunnar Bratbak D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Gunnar Bratbak sits on this spectrum.

40 D-Index: 30 scientists 41 D-Index: 86 scientists 42 D-Index: 90 scientists 43 D-Index: 117 scientists 44 D-Index: 122 scientists 45 D-Index: 123 scientists 46 D-Index: 108 scientists 47 D-Index: 110 scientists 48 D-Index: 106 scientists 49 D-Index: 109 scientists 50 D-Index: 129 scientists 51 D-Index: 111 scientists 52 D-Index: 116 scientists 53 D-Index: 127 scientists 54 D-Index: 134 scientists 55 D-Index: 134 scientists 56 D-Index: 111 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 122 scientists 62 D-Index: 126 scientists 63 D-Index: 144 scientists 64 D-Index: 109 scientists 65 D-Index: 103 scientists 66 D-Index: 124 scientists 67 D-Index: 112 scientists 68 D-Index: 103 scientists 69 D-Index: 131 scientists 70 D-Index: 93 scientists 71 D-Index: 93 scientists 72 D-Index: 96 scientists 73 D-Index: 92 scientists 74 D-Index: 80 scientists 75 D-Index: 66 scientists 76 D-Index: 87 scientists 77 D-Index: 60 scientists 78 D-Index: 73 scientists 79 D-Index: 59 scientists 80 D-Index: 57 scientists 81 D-Index: 55 scientists 82 D-Index: 47 scientists 83 D-Index: 77 scientists 84 D-Index: 50 scientists 85 D-Index: 45 scientists 86 D-Index: 42 scientists 87 D-Index: 41 scientists 88 D-Index: 32 scientists 89 D-Index: 38 scientists 90 D-Index: 35 scientists 91 D-Index: 34 scientists 92 D-Index: 27 scientists 93 D-Index: 26 scientists 94 D-Index: 33 scientists 95 D-Index: 22 scientists 96 D-Index: 37 scientists 97 D-Index: 22 scientists 98 D-Index: 21 scientists 99 D-Index: 22 scientists 100 D-Index: 30 scientists 101 D-Index: 16 scientists 102 D-Index: 20 scientists 103 D-Index: 17 scientists 104 D-Index: 19 scientists 105 D-Index: 16 scientists 106 D-Index: 19 scientists 107 D-Index: 18 scientists 108 D-Index: 14 scientists 109 D-Index: 10 scientists 110 D-Index: 9 scientists 111 D-Index: 7 scientists 112 D-Index: 11 scientists 113 D-Index: 6 scientists 114 D-Index: 15 scientists 115 D-Index: 10 scientists 116 D-Index: 12 scientists 117 D-Index: 7 scientists 118 D-Index: 10 scientists 119 D-Index: 10 scientists 120 D-Index: 11 scientists 121 D-Index: 2 scientists 122 D-Index: 7 scientists 123 D-Index: 12 scientists 124 D-Index: 5 scientists 125 D-Index: 9 scientists 126 D-Index: 6 scientists 127+ D-Index: 95 scientists
40 D-Index 127+

This scientist: 55 D-Index — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 127 D-Index or more.

Overview

Gunnar Bratbak is affiliated with the University of Bergen in Norway. Their research spans several fields within Environmental Science and Earth and Planetary Sciences, with a particular focus on Ecology, Oceanography, Molecular Biology, Atmospheric Science, and Environmental Chemistry.

They have contributed significantly to multiple topics, including:

  • Microbial Community Ecology and Physiology
  • Methane Hydrates and Related Phenomena
  • Arctic and Antarctic ice dynamics
  • Marine and coastal ecosystems
  • Environmental DNA in Biodiversity Studies
  • Protist diversity and phylogeny
  • Isotope Analysis in Ecology

Bratbak has an active publication record with numerous papers published in prominent venues. Frequent publication outlets include:

  • Progress In Oceanography
  • Elementa Science of the Anthropocene
  • Frontiers in Microbiology
  • Limnology and Oceanography
  • bioRxiv (Cold Spring Harbor Laboratory)

Recent papers authored or coauthored by Bratbak cover a variety of environmental and marine science topics. Examples include:

  • "Lateral Gene Transfer of Anion-Conducting Channelrhodopsins between Green Algae and Giant Viruses," 2020, Current Biology
  • "Still Arctic?-The changing Barents Sea," 2023, Elementa Science of the Anthropocene
  • "Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean," 2021, Frontiers in Marine Science
  • "Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux," 2023, Progress In Oceanography
  • "Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae," 2024, Nature Communications

Frequent collaborators include researchers such as Aud Larsen, Oliver Müller, Ruth-Anne Sandaa, Melissa Chierici, and Rolf Gradinger. This network reflects collaboration across marine and environmental science disciplines.

Best Publications

  • High abundance of viruses found in aquatic environments.

    Øivind Bergh;Knut Yngve BØrsheim;Knut Yngve BØrsheim;Gunnar Bratbak;Mikal Heldal

  • Bacterial dry matter content and biomass estimations.

    Gunnar Bratbak;I. Dundas

  • Enumeration of Marine Viruses in Culture and Natural Samples by Flow Cytometry

    Dominique Marie;Corina P. D. Brussaard;Runar Thyrhaug;Gunnar Bratbak

  • Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms

    G. Bratbak;JK Egge;M. Heldal

  • Bacterial biovolume and biomass estimations.

    Gunnar Bratbak

  • Cell volume to cell carbon conversion factors for a bacterivorous Monas sp. enriched from seawater

    KY Borsheim;G. Bratbak

  • Viruses as partners in spring bloom microbial trophodynamics.

    Gunnar Bratbak;Mikal Heldal;Svein Norland;T. Frede Thingstad

  • Enumeration and biomass estimation of planktonic bacteria and viruses by transmission electron microscopy.

    K Y Børsheim;G Bratbak;M Heldal

  • Elemental Composition (C, N, P) and Cell Volume of Exponentially Growing and Nutrient-Limited Bacterioplankton

    Katarina Vrede;Mikal Heldal;Svein Norland;Gunnar Bratbak

  • Production and decay of viruses in aquatic environments

    M. Heldal;G. Bratbak

  • Flow cytometric detection of viruses.

    Corina P.D. Brussaard;Dominique Marie;Gunnar Bratbak

  • Global-scale processes with a nanoscale drive: the role of marine viruses

    Corina P.D. Brussaard;Steven W. Wilhelm;T. Frede Thingstad;Markus G. Weinbauer

  • Viral lysis and bacterivory as prokaryotic loss factors along a salinity gradient

    Guixa-Boixareu N;Calderón-Paz Ji;Heldal M;Bratbak G

  • Incorporation of viruses into the budget of microbial C-transfer A first approach

    G. Bratbak;M. Heldal;TF Thingstad;B. Riemann

  • VIRUSES AND THE MICROBIAL LOOP

    G. Bratbak;F. Thingstad;M. Heldal

  • Flow cytometric analysis of an Emiliana huxleyi bloom terminated by viral infection

    Stéphan Jacquet;Mikal Heldal;Debora Iglesias-Rodriguez;Aud Larsen

  • Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem

    T. F. Thingstad;R. G. J. Bellerby;R. G. J. Bellerby;G. Bratbak;K. Y. Børsheim

  • Occurrence of virus-like particles in the Dead Sea.

    Aharon Oren;Gunnar Bratbak;Mikal Heldal

  • Elevated production of dimethylsulfide resulting from viral infection of cultures of Phaeocystis pouchetii

    Gillian Malin;William H. Wilson;Gunnar Bratbak;Peter S. Liss

  • ISOLATION AND CHARACTERIZATION OF A VIRUS INFECTING PHAEOCYSTIS POUCHETII (PRYMNESIOPHYCEAE)1

    Anita Jacobsen;Gunnar Bratbak;Mikal Heldal

  • Isolation and characterization of two viruses with large genome size infecting Chrysochromulina ericina (Prymnesiophyceae) and Pyramimonas orientalis (Prasinophyceae).

    Ruth-Anne Sandaa;Mikal Heldal;Tonje Castberg;Runar Thyrhaug

Frequent Co-Authors

Aud Larsen
Aud Larsen NORCE Research
Corina P. D. Brussaard
Corina P. D. Brussaard Utrecht University
T. Frede Thingstad
T. Frede Thingstad University of Bergen
Stéphan Jacquet
Stéphan Jacquet INRAE : Institut national de recherche pour l'agriculture, l'alimentation et l'environnement
Lise Øvreås
Lise Øvreås University of Bergen
Hiroyuki Ogata
Hiroyuki Ogata Kyoto University
Dominique Marie
Dominique Marie Sorbonne University
Richard G. J. Bellerby
Richard G. J. Bellerby East China Normal University
Jean-Michel Claverie
Jean-Michel Claverie Aix-Marseille University
Melissa Chierici
Melissa Chierici University Centre in Svalbard

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