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Laboratoire d'Océanographie Microbienne
UMR 7621




Directrice de Recherche DR2 CNRS

Laboratoire d'Océanographie Microbienne (LOMIC) - UMR 7621 CNRS-UPMC

66650 Banyuls sur mer, France

Tél: 33 (0)4 68 88 73 53

E-mail: ingrid.obernosterer @


Research ID: A-5434-2011

Ingrid Obernosterer

Senior Research Scientist – DR CNRS


Previous employment

Marie Curie Fellow at the Biological Oceanography Lab, Banyuls sur mer

PostDoc at the University of South Carolina, USA



Ph.D. 2000, University of Groningen, The Netherlands

M.S. 1994, University of Vienna, Austria


Research Interests

Microbial oceanography and microbial ecology, links between structure and function of microbial communities, bacterial roles in the marine carbon and iron cycles, interactions between dissolved organic matter and microbial diversity, natural iron fertilization of the Southern Ocean, classical biogeochemical approaches and meta-omics tools



2018-2022: co-PI and chief scientist of the project MOBYDICK  (Marine Ecosystem Biodiversity and Dynamics of Carbon around Kerguelen: an integrated view)

2014-2019: SOCLIM (Southern Ocean and Climate)

2016-2019: HEOBI (Heard Earth-Ocean-Biosphere-Interactions) voyage aboard the Australian R/V Investigator

2011-2013: KEOPS2 (Kerguelen Ocean and Plateau Compared Study)

2006-2009: KEOPS1 (Kerguelen Ocean and Plateau Compared Study)


PhD Students (past 5 years)

Pavla Debeljak

Yan Liu

Marine Landa

Laetitia Dadaglio


PostDocs (past 5 years) :

Sun Ying

Eva Ortega-Retuerta, Marie Curie fellow

Julie Dinasquet, Marie Curie fellow

Beier Sara 


Publications (past 5 years)

Debeljak P., E. Toulza, S. Beier, S. Blain, I. Obernosterer (2019) Microbial iron metabolism as revealed by gene expression profiles in contrasted Southern Ocean regimes Environ. Microbiol.doi:10.1111/1462-2920.14621

Liu Y., P. Debeljak, M. Rembauville, S. Blain, I. Obernosterer (2019) Diatoms shape the biogeography of heterotrophic prokaryotes in early springin the Southern Ocean. Environ. Microbiol. doi:10.1111/1462-2920.14579

Koedooder C., A. Guéneuguès, R. Van Geersdaële, V. Vergé, F.-Y. Bouget, Y. Labreuche, I. Obernosterer, S. Blain (2018) The role of the glyoxylate shunt in the acclimation to iron limitation in marine heterotrophic bacteria. Front.Mar. Sci. 5:435. doi: 10.3389/fmars.2018.00435

Dadaglio L., J. Dinasquet, I. Obernosterer, F. Joux (2018) Differential responses of bacteria to diatom-derived dissolved organic matter in the Arctic Ocean. Aquat Microb Ecol 82:59-72

Dinasquet J., E. Ortega-Retuerta, C. Lovejoy, I. Obernosterer. Editorial: Microbiology of the rapidly changing polar environments. Front.Mar. Sci. 5: 154. Doi: 10.3389/fmars.2018.00154 

Landa M., S. Blain, J. Harmand, S. Monchy, A. Rapaport, I. Obernosterer (2018) Major changes in the composition of a Southern Ocean bacterial community in response to diatom-derived dissolved organic matter. FEMS Microbiology Ecology, 94: fiy034.

Fourquez M., S. Beier, E. Jongmans, R. Hunter, I. Obernosterer (2016) Uptake of leucine, chitin and iron by prokaryotic groups during spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island (Southern Ocean) Front. Mar. Sci. 3:256. doi: 10.3389/fmars.2016.00256   

Lasbleiz M., K. Leblanc, L. Armand, U. Christaki, C. Georges, I. Obernosterer, B. Quéguiner (2016) Composition of diatom communities and their contribution to plankton biomass in the naturally iron fertilized region of Kerguelen in the Southern Ocean. FEMS Microbiology Ecology 92, fiw171

Moran M.-A., E.B. Kujawinski, A. Stubbins, R. Fatland, L.I. Aluwihare, A. Buchan, B.C. Crump, P.C. Dorrestein, S.T. Dyhrman, N.J. Hess, B. Howe, K. Longnecker, P.M. Medeiros, J. Niggemann, I. Obernosterer, D.J. Repeta, J.R. Waldbauer (2016) Deciphering ocean carbon in a changing world. PNAS 113 : 3143-3151.

Landa M., Blain S., Christaki U., Monchy S., ObernostererI. (2016) Shifts in bacterial community composition associated with increased carbon cycling in a mosaic of phytoplankton blooms ISME J. 10: 39-50

Beier S., Gálvez M.J., Molina V., Sarthou G., Queroué F., Blain S., Obernosterer I (2015) The transcriptional regulation of the glyoxylate cycle in SAR11 in response to iron fertilization in the Southern Ocean EMIR 7: 427-434 doi:10.1111/1758-2229.12267 (IF: 3.5). 

Beier S., Rivers A.R., MoranM.A., Obernosterer I. (2015) Phenotypic Plasticity in Heterotrophic Marine Microbial Communities. ISMEJ 9: 1141-1151 56. 

Beier S., Rivers, A.R., Moran M.A., Obernosterer I. (2015) The transcriptional response of prokaryotes to phytoplankton-derived DOM in seawater. Environ Microbiol 17: 3466-3480. 

Bowie A.R. van der Merwe P., Quéroué F., Trull T., Fourquez M., Planchon F., Sarthou G., Chever F., Townsend A.T., Obernosterer I., Sallée J.-B., Blain S. (2015) Iron budgets for three distinct biogeochemical sites around the Kerguelen Archipelago (Southern Ocean) during the natural fertilisation study KEOPS-2. BG 12: 4421-4445 

Obernosterer I., M. Fourquez, S. Blain (2015) Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off Kerguelen Islands. BG 12: 1983-1992 

Fourquez M., I. Obernosterer, D. Davies, T. Trull, S. Blain (2015). Microbial iron uptake in the naturally fertilized waters in the vicinity of Kerguelen Islands: phytoplankton-bacteria interactions. BG 12: 1893-1906 

Tremblay, J. Caparros, K. Leblanc, I. Obernosterer (2015) Origin and fate of particulate and dissolved organic matter in a naturally iron-fertilized region of the Southern Ocean. BG 12: 607-621 (IF: 4.64).

Blain S., J. Capparos, A. Guéneuguès, I. Obernosterer, L. Oriol (2015) Distributions and stoichiometry of dissolved nitrogen and phosphorus in the iron fertilized region near Kerguelen (Southern Ocean). BG 12 : 623-635 

Christaki U., Lefèvre D., Georges C., Colombet J., P; Catala, Sime-Ngando T., S. Blain, Obernosterer I. (2014) Microbial food web dynamics during spring phytoplankton blooms in the naturally iron fertilized Kerguelen area (Southern Ocean) Biogeosciences 11, 6739-6753 

Salter I., P. E. Galand, S. K. Fagervold, P. Lebaron, I. Obernosterer, M. Oliver, M.T. Suzuki, C. Tricoire(2015) Seasonal dynamics of active SAR11 ecotypes in the oligotrophic Northwest Mediterranean Sea. ISMEJ 9: 347-360  

MalitsA., ChristakiU., Obernosterer I., Weinbauer M.G.(2014). Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau. Biogeosciences 11, 5931-5955 

Pulido-Villena, E., Baudoux A.-C., Obernosterer I., Landa M., Caparros J., Catala P., Georges C., Harmand J., and Guieu C. (2014) Microbial food web dynamics in response to a Saharan dust event: results from a mesocosm study in the oligotrophic Mediterranean Sea. Biogeosciences 11: 5607-5619 

Fourquez M., Devez A.,Schaumann A.,Gueneugues A.,Jouenne T.,Obernosterer I.,S. Blain (2014). Effects of iron limitation on growth and carbon metabolism in oceanic and coastal heterotrophic bacteria. Limnol Oceanogr 59: 349-360 

Landa, M., M. Cottrell, D. Kirchman, K. Kaiser, P.M. Medeiros, L. Tremblay, N. Batailler, J. Caparros, P. Catala, K. Escoubeyrou, L. Oriol, S. Blain and I. Obernosterer (2014) Phylogenetic and structural response of heterotrophic bacteria to dissolved organic matter of different chemical composition in a continuous culture. Environ Microbiol. 16:1668-1681 




Traductions :

    Le LOMIC en chiffres

    8 Chercheurs CNRS
    3 Enseignant-chercheurs

    1 Chercheuse accueillie

    8 Tech/Ingénieurs

    1 Post doctorant

    1 CDD Ingénieur
    9 Etudiants en thèse