I am a microbial ecologist interested in how natural and human drivers affect populations, communities and ecosystems at different spatial and temporal scales. 

I am a Group Leader at the Computational Biological Unit (CBU), and lead the work-package 'Energy and Life' at the K.G. Jebsen Centre for Deep Sea Research.

My research is centered around the following research questions:

How is microbial community structure and diversiy shaped by chemical power supply?

What is the connection between the geological setting, geochemistry, and microbial ecology of hydrothermal systems?

How does marine mine tailings in Norwegian fjords affect microbial life?

What is the optimal microbial community structure in land-based fish farms (RAS), and how to maintain it?

To address these questions we make use of population dynamic models, field observations, and statistical analyses. A central part of our work is bioinformatic analyses of next generation sequencing data.

Please make contact if you are interested in a PhD, MSc, or a Bachelor project connected to any of these themes.

 

 

Public outreach

Polhavets hemmeligheter (kronikk i Nordlys)

 

Academic lecture

• Fredriksen, Simen; Fernandes, Paulo; Khadka, Sujan et al. (2024). Impact of particle load on water quality and microbiota in salmon recirculating aquaculture systems. (external link)
• Saltvedt, Marius Rydningen; Wang, Haina; Dahle, Håkon et al. (2023). PERSISTENT VIRUS PRODUCTION BY PHYTOPLANKTON. (external link)
• Hribovšek, Petra; Denny, Emily Maria; Dahle, Håkon et al. (2022). Iron oxidizing bacteria producing sheath structures in mats on high temperature chimneys at Fåvne hydrothermal vent field. (external link)
• Wang, Haina; Saltvedt, Marius Rydningen; Blanc-Mathieu, Romain et al. (2022). Genomes of two giant viruses and their capacity in the infection cycles. (external link)
• Olsen, Linn Merethe Brekke; Kutti, Tina; Dahle, Håkon et al. (2019). Biogeochemical processes in submarine mine tailings and the impact on benthic fauna.. (external link)
• Sandaa, Ruth-Anne; Blanc-Mathieu, Romain; Dahle, Håkon et al. (2019). Friends or foes, strategies for stable co-existance in algel viruses infecting haptophytes. (external link)
• Roalkvam, Irene; Drønen, Karine; Dahle, Håkon et al. (2018). Mikrobiell overvåkning av rognkjeksanlegg ved omfattende prøvetaking og detaljert analyseverktøy. (external link)
• Drønen, Karine; Roalkvam, Irene; Nilsen, Hanne Katrine et al. (2018). Monitoring the main changes in the bacterial community in a RAS biofilter during the first year of operation.. (external link)
• Roalkvam, Irene; Drønen, Karine; Wergeland, Heidrun Inger et al. (2018). Mikrobiell overvåkning av rognkjeksanlegg -prøvetaking og analyseverktøy. (external link)
• Økland, Ingeborg Elisabet; Dahle, Håkon; Thorseth, Ingunn Hindenes et al. (2016). Weathering of sulphides at the Arctic Mid-Ocean Ridge. (external link)
• Johannessen, Karen Cecilie; Vander Roost, Jan Pieter; Dahle, Håkon et al. (2016). Local environmental controls on microbial Fe(II)-oxidation in seafloor hydrothermal deposits. (external link)
• Økland, Ingeborg Elisabet; Gravdal, Julianne K.S.; Kvassnes, Astri J.S. et al. (2016). Mobilization of heavy metals in submarine mine tailings. (external link)
• Steen, Ida Helene; Dahle, Håkon; Roalkvam, Irene et al. (2014). Microbial communities associated with low-temperature venting barite chimneys in the Loki´s Castle black smoker field. (external link)
• Dahle, Håkon; Økland, Ingeborg Elisabet; Thorseth, Ingunn Hindenes et al. (2014). Use of metatranscriptomics, amplicon pyrosequencing and thermodynamics to assess how microbial communities are shaped by energy availability. (external link)
• Dahle, Håkon; Økland, Ingeborg Elisabet; Thorseth, Ingunn Hindenes et al. (2014). Energy landscapes shape microbial communities and the distribution of biosignatures in hydrothermal systems on the Arctic Mid-Ocean Ridge. (external link)
• Steen, Ida Helene; Dahle, Håkon; Roalkvam, Irene et al. (2014). Microbial communities associated with low-temparture venting barite chimneys in the Loki´s Castle black smoker field. (external link)
• Thorseth, Ingunn Hindenes; Eickmann, Benjamin; Steen, Ida Helene et al. (2013). Formation of barite chimneys at low-temperature hydrothermal venting: evidence for complex geobio-interactions. (external link)
• Dahle, Håkon; Økland, Ingeborg Elisabet; Pedersen, Rolf B. et al. (2013). Thermodynamic constraints on the microbial ecology and biogeochemical cycling in deep-sea hydrothermal systems. (external link)
• Stokke, Runar; Dahle, Håkon; Steen, Ida Helene (2012). Metagenomics of arctic hydrothermal vent biofilms. (external link)
• Thorseth, Ingunn Hindenes; Steen, Ida Helene; Roalkvam, Irene et al. (2011). Microbial processes and biomineralisation associated with low-temperature venting and formation of barite chimneys at Loki's Castle hydrothermal field. (external link)
• Dahle, Håkon; Roalkvam, Irene; Jørgensen, Steffen Leth et al. (2010). A variety of microbial mats cover the chimney walls of the Loki's Castle hydrothermal field. (external link)
• Dahle, Håkon; Garshol, Frøydis; Madsen, Marit et al. (2003). Treasures in the deep biosphere of North Sea oil-wells. (external link)
• Bjørgo, Ole Christian; Lien, Torleiv; Madsen, Marit et al. (2000). Thermosipho strain TBA5, a new thermophilic anaerobic bacterium, isolated from a North Sea oil field. (external link)
• Bjørgo, Ole Christian; Lien, Torleiv; Madsen, Marit Steine et al. (2000). Thermosipho strain TBA5, a new thermophilic anaerobic bacterium, isolated from a North Sea oil field. (external link)

Academic article

• Hribovšek, Petra; Denny, Emily Maria; Mall, Achim et al. (2024). daptation strategies of iron-oxidizing bacteria Gallionella and Zetaproteobacteria crossing the marine–freshwater barrier. (external link)
• Jafari, Leila; Montjourides, Marie Aline; Hosfeld, Anne-Camilla Diesen et al. (2024). Biofilter and degasser performance at different alkalinity levels in a brackish water pilot scale recirculating aquaculture system (RAS) for post-smolt Atlantic salmon. (external link)
• Grant, Danielle; Steinsland, Kristine; Cordier, Tristan et al. (2024). Sedimentary ancient DNA sequences reveal marine ecosystem shifts and indicator taxa for glacial-interglacial sea ice conditions. (external link)
• Hribovšek, Petra; Denny, Emily Maria; Dahle, Håkon et al. (2023). Putative novel hydrogen- and iron-oxidizing sheath-producing Zetaproteobacteria thrive at the Fåvne deep-sea hydrothermal vent field. (external link)
• Tjendra, Jesslyn; Storesund, Julia Endresen; Dahle, Håkon et al. (2023). Molecular evidence of parallel evolution in a cyanophage. (external link)
• Vulcano, Francesca; Hahn, Cedric Jasper; Roerdink, Desiree Lisette et al. (2022). Phylogenetic and functional diverse ANME-1 thrive in Arctic hydrothermal vents. (external link)
• Drønen, Asbjørg Karine; Roalkvam, Irene; Dahle, Håkon et al. (2022). Microbiome dataset from a marine recirculating aquaculture system (RAS) for salmon post-smolt production in Norway. (external link)
• Drønen, Asbjørg Karine; Roalkvam, Irene; Nilsen, Hanne Katrine et al. (2022). Presence and habitats of bacterial fish pathogen relatives in a marine salmon post-smolt RAS. (external link)
• Ramirez-Llodra, Eva; Argentino, Claudio; Baker, Maria et al. (2022). Hot Vents Beneath an Icy Ocean: The Aurora Vent Field, Gakkel Ridge, Revealed. (external link)
• Sandaa, Ruth-Anne; Saltvedt, Marius Rydningen; Dahle, Håkon et al. (2021). Adaptive evolution of viruses infecting marine microalgae (haptophytes), from acute infections to stable coexistence. (external link)
• Blanc-Mathieu, Romain; Dahle, Håkon; Hofgaard, Antje et al. (2021). A persistent giant algal virus, with a unique morphology, encodes an unprecedented number of genes involved in energy metabolism. (external link)
• Drønen, Asbjørg Karine; Roalkvam, Irene; Dahle, Håkon et al. (2021). Microbial colonization and community stability in a marine post-smolt RAS inoculated with a commercial starter culture. (external link)
• ARSIN, Hasan; Jasilionis, Andrius; Dahle, Håkon et al. (2021). Exploring codon adjustment strategies towards Escherichia coli-based production of viral proteins encoded by HTH1, a novel prophage of the marine bacterium Hypnocyclicus thermotrophus. (external link)
• Diego Castro, David; Hannisdal, Bjarte; Dahle, Håkon (2021). On how the power supply shapes microbial survival. (external link)
• Zhao, Rui; Dahle, Håkon; Ramírez, Gustavo A. et al. (2020). Indigenous ammonia-oxidizing archaea in oxic subseafloor oceanic crust. (external link)
• Stokke, Runar; Reeves, Eoghan; Dahle, Håkon et al. (2020). Tailoring hydrothermal vent biodiversity towards improved biodiscovery using a novel in-situ enrichment strategy. (external link)
• Roalkvam, Irene; Drønen, Karine; Dahle, Håkon et al. (2020). A case study of biofilter activation and microbial nitrification in a marine recirculation aquaculture system for rearing Atlantic salmon (Salmo salar L.). (external link)
• Le Moine Bauer, Sven; Sjøberg, Andreas Gilje; L´Haridon, Stephane et al. (2019). Profundibacter amoris gen. nov., sp. nov., a new member of the Roseobacter clade isolated from Loki's Castle Vent Field on the Arctic Mid-Ocean Ridge. (external link)
• Roalkvam, Irene; Drønen, Karine; Dahle, Håkon et al. (2019). Microbial Communities in a Flow-Through Fish Farm for Lumpfish (Cyclopterus lumpus L.) During Healthy Rearing Conditions. (external link)
• Roalkvam, Irene; Drønen, Karine; Dahle, Håkon et al. (2019). Comparison of active biofilm carriers and commercially available inoculum for activation of biofilters in marine recirculating aquaculture systems (RAS). (external link)
• Le Moine Bauer, Sven; Stensland, Anne; Daae, Frida Lise et al. (2018). Water masses and depth structure prokaryotic and T4-like viral communities around hydrothermal systems of the Nordic Seas. (external link)
• Vander Roost, Jan Pieter; Daae, Frida Lise; Steen, Ida Helene et al. (2018). Distribution patterns of iron-oxidizing Zeta- and Beta-Proteobacteria from different environmental settings of the Jan Mayen vent fields. (external link)
• Dahle, Håkon; Le Moine Bauer, Sven; Baumberger, Tamara et al. (2018). Energy landscapes in hydrothermal chimneys shape distribution of primary producers. (external link)
• Johannessen, Karen Cecilie; Vander Roost, Jan Pieter; Dahle, Håkon et al. (2017). Environmental controls on biomineralization and Fe-mound formation in a low-temperature hydrothermal system at the Jan Mayen Vent Fields. (external link)
• Vander Roost, Jan Pieter; Thorseth, Ingunn Hindenes; Dahle, Håkon (2017). Microbial analysis of Zetaproteobacteria and co-colonizers of iron mats in the Troll Wall Vent Field, Arctic Mid-Ocean Ridge. (external link)
• Steen, Ida Helene; Dahle, Håkon; Stokke, Runar et al. (2016). Novel barite chimneys at the Loki´s Castle vent field shed light on key factors shaping microbial communities and functions in hydrothermal systems. (external link)
• Le Moine Bauer, Sven; Roalkvam, Irene; Steen, Ida Helene et al. (2016). Lutibacter profundi sp. nov., isolated from a deep-sea hydrothermal system on the Arctic Mid-Ocean Ridge and emended description of the genus Lutibacter. (external link)
• Lin, T. Jennifer; Ver Eecke, Helene C.; Breves, Elly A. et al. (2016). Linkages between mineralogy, fluid chemistry, and microbial communities within hydrothermal chimneys from the Endeavour Segment, Juan de Fuca Ridge. (external link)
• Hestetun, Jon Thomassen; Dahle, Håkon; Jørgensen, Steffen Leth et al. (2016). The Microbiome and Occurrence of Methanotrophy in Carnivorous Sponges. (external link)
• Dahle, Håkon; Økland, Ingeborg Elisabet; Thorseth, Ingunn Hindenes et al. (2015). Energy landscapes shape microbial communities in hydrothermal systems on the Arctic Mid-Ocean Ridge. (external link)
• Nesbø, Camilla Lothe; Swithers, Kirsten S.; Dahle, Håkon et al. (2015). Evidence for extensive gene flow and Thermotoga subpopulations in subsurface and marine environments. (external link)
• Roalkvam, Irene; Drønen, Karine; Stokke, Runar et al. (2015). Physiological and genomic characterization of Arcobacter anaerophilus IR-1 reveals new metabolic features in Epsilonproteobacteria. (external link)
• Stokke, Runar; Dahle, Håkon; Roalkvam, Irene et al. (2015). Functional interactions among filamentous Epsilonproteobacteria and Bacteroidetes in a deep-sea hydrothermal vent biofilm. (external link)
• Dahle, Håkon; Roalkvam, Irene; Pedersen, Rolf B. et al. (2013). The versatile in situ gene expression of an Epsilonproteobacteria-dominated biofilm from a hydrothermal chimney. (external link)
• Økland, Ingeborg Elisabet; Huang, Shanshan; Dahle, Håkon et al. (2012). Low temperature alteration of serpentinized ultramafic rock and implications for microbial life. (external link)
• Roalkvam, Irene; Dahle, Håkon; Chen, Yifeng et al. (2012). Fine-scale community structure analysis of ANME in Nyegga sediments with high and low methane flux. (external link)
• Roalkvam, Irene; Jørgensen, Steffen Leth; Chen, Yifeng et al. (2011). New insight into stratification of anaerobic methanotrophs in cold seep sediments. (external link)
• Dahle, Håkon; Hannisdal, Bjarte; Steinsbu, Bjørn Olav et al. (2011). Evolution of temperature optimum in Thermotogaceae and the prediction of trait values of uncultured organisms. (external link)
• Nesbø, Camilla L.; Bapteste, Eric; Curtis, Bruce et al. (2009). The Genome of Thermosipho africanus TCF52B: Lateral Genetic Connections to the Firmicutes and Archaea. (external link)
• DiPippo, Jonathan L.; Nesbø, Camilla L.; Dahle, Håkon et al. (2009). Kosmotoga olearia gen. nov., sp nov., a thermophilic, anaerobic heterotroph isolated from an oil production fluid. (external link)
• Dahle, Håkon; Garshol, Frøydis Kristi; Madsen, Marit Steine et al. (2008). Microbial community structure analysis of produced water from a high-temperature North Sea oil-field. (external link)
• Lu, Ming; Grøv, Eivind; Dahle, Håkon et al. (2008). Rock support design for special lighting caverns in high in-situ stress rock mass. (external link)
• Dahle, Håkon; Birkeland, Nils-Kåre (2006). Thermovirga lienii gen. nov., sp. nov., a novel moderately thermophilic, anaerobic, amino-acid-degrading bacterium isolated from a North Sea oil well. (external link)

Article in business/trade/industry journal

• Hess-Erga, Ole-Kristian; Fernandes, Paulo; Calabrese, Sara et al. (2023). Er lav partikkelbelastning i RAS fordelaktig?. (external link)
• Drønen, Karine; Roalkvam, Irene; Nilsen, Hanne Katrine et al. (2018). Biofilterprosesser i endring over tid. (external link)

Poster

• Denny, Emily Maria; Mall, Achim; Hribovšek, Petra et al. (2022). Interpretation of microbial food webs from metagenomic data in deep-sea hydrothermal vents across the Arctic Mid-Ocean Ridge. (external link)
• Hribovšek, Petra; Denny, Emily Maria; Dahle, Håkon et al. (2022). Sheath-forming Zetaproteobacteria abundant in black smoker chimney mats at the newly discovered Fåvne hydrothermal vent field. (external link)
• Hribovšek, Petra; Denny, Emily Maria; Dahle, Håkon et al. (2022). Sheath-forming Zetaproteobacteria abundant in black smoker chimney mats at the newly discovered Fåvne hydrothermal vent field. (external link)
• Wang, Haina; Saltvedt, Marius Rydningen; Blanc-Mathieu, Romain et al. (2022). Genomes of two giant viruses and their capacity in the infection cycles. (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)
• Hribovšek, Petra; Denny, Emily Maria; Viflot, Thomas Øfstegaard et al. (2021). Iron Oxidizers and Sheath-forming Zetaproteobacteria in Biofilms of the Newly Discovered Fåvne Hydrothermal Vent Field. (external link)
• Vulcano, Francesca; Stokke, Runar; Dahle, Håkon et al. (2019). Identification of key-players in anaerobic alkane oxidation in the diffuse venting Barite Field at the Loki´s castle. (external link)
• Drønen, Karine; Roalkvam, Irene; Dahle, Håkon et al. (2019). Effect of UV water treatment on microbial community structure Studied in two different land based aquaculture systems. (external link)
• Roalkvam, Irene; Drønen, Karine; Dahle, Håkon et al. (2019). Microbial activation of biofilters in marine RAS -based on lab experiments and field observations. (external link)
• Roalkvam, Irene; Stokke, Runar; Drønen, Karine et al. (2015). Isolation, characterization and genome analysis of a nitrate reducing Arcobacter sp. isolated from injection water. (external link)
• Vander Roost, Jan Pieter; Thorseth, Ingunn Hindenes; Pedersen, Rolf B. et al. (2014). Comparison of microbial communities within iron-containing mats at different geochemical settings in the Jan Mayen vent field. (external link)
• Steen, Ida Helene; Stokke, Runar; Wissuwa, Juliane et al. (2014). Exploring the biotechnological potential of microbial communities in the Jan Mayen Vent Fields by use of in situ incubation chambers. (external link)
• Le Moine Bauer, Sven; Steen, Ida Helene; Sandaa, Ruth-Anne et al. (2014). Microbial community changes within a chimney wall at the basalt-hosted Jan Mayen vent field (JMVF):Modeled predictions vs. Pyrosequencing data. (external link)
• Gravdal, Julianne K.S.; Økland, Ingeborg Elisabet; Dahle, Håkon et al. (2013). Stability of heavy metals in submarine tailings: A geochemical and microbiological study. (external link)
• Steen, Ida Helene; Julianne, Wissuwa; Steinsbu, Bjørn Olav et al. (2013). Exploring the biotechnological potential of microbial communities in the Jan Mayen Vent Fields by use of in situ incubation chambers. (external link)
• Thorseth, Ingunn Hindenes; Steen, Ida Helene; Eickmann, Benjamin et al. (2012). Microbial mediated formation of low-temperature hydrothermal barite chimneys. (external link)
• Dahle, Håkon; Roalkvam, Irene; Thorseth, Ingunn Hindenes et al. (2012). Metatranscriptomic and phylogenetic analysis of bacterial mats growing on chimney surfaces at the Loki´s Castle hydrothermal field. (external link)
• Møller, Kirsten; Schoenberg, R; Thorseth, Ingunn Hindenes et al. (2012). Combined spectroscopic, microscopic and DNA analyses of hydrothermal siliceous Fe despots. (external link)
• Økland, Ingeborg Elisabet; Daae, F.L; Dahle, Håkon et al. (2012). Low temperature alteration of ultramafic rock sustaining associated microbial communities. (external link)
• Hoem, Solveig; Dahle, Håkon; Roalkvam, Irene et al. (2010). Detection of methanotrophic archaea in a barite chimney at Loki’s Castle, the Arctic Mid-Ocean Ridge. (external link)
• Dahle, Håkon; Roalkvam, Irene; Jørgensen, Steffen Leth et al. (2010). Microbial community structure of biomats and chimney walls of the Loki’s Castle hydrothermal field at 73°N. (external link)
• DiPippo, Jonathan L.; Nesbø, Camilla L.; Dahle, Håkon et al. (2008). Kosmotoga olearia gen. nov., sp. nov., a thermophilic, anaerobic heterotroph isolated from Troll B oil production fluid in the North Sea. (external link)
• Dahle, Håkon; Garshol, Frøydis; Madsen, Marit Steine et al. (2007). Microbial community structure analysis of produced water from a high-temperature North-Sea oil-field. (external link)
• Dahle, Håkon; Garshol, Frøydis; Madsen, Marit Steine et al. (2007). Microbial community structure analysis of produced water from a high-temperature oil-field in the North-Sea. (external link)
• Dahle, Håkon; Madsen, Marit Steine; Garshol, Frøydis et al. (2005). Molecular and Culture-Based Analysis of Bacteria and Archaea from a North Sea Oil-Reservoir. (external link)
• Birkeland, Nils-Kåre; Dahle, Håkon; Madsen, Marit (2005). Molecular and Culture-Based Analyses of Bacteria and Archaea from a North Sea Oil-Reservoir. (external link)
• Dahle, Håkon; Birkeland, Nils-Kåre (2004). Enrichment and isolation of thermophilic organisms capable of fermenting organic polymers. (external link)
• Garshol, Frøydis; Dahle, Håkon; Madsen, Marit et al. (2003). Analysis of microbial communities associated with deep North Sea oil-wells using culture-dependent and culture-independent strategies. (external link)
• Garshol, Frøydis; Dahle, Håkon; Madsen, Marit et al. (2003). Analysis of microbial communities associated with deep North Sea oil-wells using culture-dependent and culture-independent strategies. (external link)
• Dahle, Håkon; Birkeland, Nils-Kåre (2003). Bioprospecting of thermophilic hydrogen-producing microorganisms. (external link)
• Birkeland, Nils-Kåre; Garshol, Frøydis; Dahle, Håkon et al. (2002). Novel bacterial lineages dominating in oil-well formation water. (external link)
• Dahle, Håkon; Lien, Torleiv; Madsen, Marit et al. (2000). Characterisation of a new bacterial strain from the order Thermotogales, isolated from an oil-producing well in the North Sea. (external link)
• Dahle, Håkon; Lien, Torleiv; Madsen, Marit Steine et al. (2000). Characterisation of a new bacterial strain from the order Thermotogales, isolated from an oil-producing well in the North Sea. (external link)
• Bjørgo, Ole Christian; Dahle, Håkon; Lien, Torleiv et al. (1999). Isolation and characterization of two <I>Petrotoga</I>-like isolates from a North Sea oil-producing well. (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)
• Stokke, Runar; Dahle, Håkon; Roalkvam, Irene et al. (2014). Metagenomic study of a filamentous microbial mat from the Loki´s Castle Vent Field. (external link)
• Dahle, Håkon; Økland, Ingeborg Elisabet; Roalkvam, Irene et al. (2014). Towards a framework for analyses of how energy landscapes shape microbial communities in deep-sea hydrothermal systems. (external link)

Academic literature review

• Aevarsson, Arnthór; Kaczorowska, Anna-Karina; Adalsteinsson, Björn Thor et al. (2021). Going to extremes - A metagenomic journey into the dark matter of life. (external link)
• Daae, Frida Lise; Økland, Ingeborg Elisabet; Dahle, Håkon et al. (2013). Microbial life associated with low-temperature alteration of ultramafic rocks in the Leka ophiolite complex. (external link)

Doctoral dissertation

• Vander Roost, Jan Pieter; Dahle, Håkon (2018). Iron-Oxidizing Microorganisms at the Jan Mayen Hydrothermal Vent Fields. (external link)
• Dahle, Håkon; Birkeland, Nils-Kåre (2007). Microbiological analyses of produced water from a high-temperature oil formation in the North-Sea. (external link)

Thesis at a second degree level

• Dahle, Håkon (2001). Karakterisering av en bakteriestamme fra ordenen Thermotogales, isolert fra et oljereservoar i Nordsjøen. (external link)

See a complete overview of publications in Cristin.

Current projects:

VIRVAR - Uncovering key players for regulation of phytoplankton function and structure: lessons to be learned from algal virus-haptophyte coexistence (NFR)

MONITOR - Adapting monitoring tools for bacterial load detection in closed marine fish farms: for improved fish health and reduced mortalities (NFR)