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Laboratoire d'Océanographie Microbienne
UMR 7621




Directrice de Recherche DR1 CNRS

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

66650 Banyuls sur mer, France

Tél: 33 (0)4 68 88 73 53

E-mail: ingrid.obernosterer @


ORCID: 0000-0002-2530-8111

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


Ongoing and recent Projects

2019-2023: BINGO -  Bioavailability of Fe contained in nanoparticles of glacial origin

2020-2024: SWINGS  - South West Indian Geotraces Section

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 aboard the Australian R/V Investigator


PhD Students and PostDocs (past 5 years)

Rhea Thoppil (2022-present)

Yanhui KONG (2022-present)

Rui Zhang (2020-present)

Pavla Debeljak

Yan Liu

Sun Ying


Publications (past 5 years)

Debeljak P., B. Bayer, Y. Sun, G.J. Herndl, I. Obernosterer (accepted). Seasonal patterns in microbial carbon and iron transporter expression in the Southern Ocean. Microbiome

Zhang R., P. Debeljak, S. Blain, I. Obernosterer (2023). Seasonal shifts in Fe-acquisition strategies in Southern Ocean microbial communities revealed by metagenomics and autonomous sampling. Environ. Microbiol. DOI: 10.1111/1462-2920.16397

Bouchachi, N., I. Obernosterer, B. Marie, O. Crispi, C. Carpaneto-Bastos, F. Li, L. Scenna, P. Catala, E. Ortega-Retuerta (2023) Effects of phosphorus limitation on the bioavailability of DOM released by marine heterotrophic prokaryotes. Microbial Ecology.

Blain, S., H. Planquette, I. Obernosterer, and A. Guéneuguès. 2022. Vertical Flux of Trace Elements Associated With Lithogenic and Biogenic Carrier Phases in the Southern Ocean. Global Biogeochemical Cycles 36. doi:10.1029/2022GB007371

Bouchachi N., I. Obernosterer, B. Marie, O. Crispi, E. Ortega-Retuerta (2022). Phosphorus limitation determines the quality of dissolved organic matter released by marine heterotrophic prokaryotes. Limnology and Oceanography Letters

Pinhassi J., H.M. Farnelid, S. Martínez-García, E. Teira, P.E. Galand, I. Obernosterer, C. Quince, M. Vila-Costa, J. M. Gasol, D. Lundin, A. F. Andersson, M. Labrenz, L. Riemann. (2022) Functional responses of key marine bacteria to environmental change -towards genetic counselling for coastal waters. Front. Microbiology. DOI : 10.3389/fmicb.2022.869093

Dinasquet J., M. Landa, I. Obernosterer. SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean (2022). Environmental Microbiology Reports. DOI: 10.1111/1758-2229.13117

Debeljak P., S. Blain, A. Bowie, P. van der Merwe, B. Bayer, I. Obernosterer (2021). Homeostasis drives intense microbial trace metal processing on marine particles. Limnol. Oceanogr. DOI: 10.1002/LNO.11923

Sun, Y., Debeljak, P., Obernosterer, I. (2021) Microbial iron and carbon metabolism as revealed by taxonomy-specific functional diversity in the Southern Ocean. ISME J

Behind the Paper:

Hernandez Magana A.E., Y. Liu, P. Debeljak, O. Crispi, B. Marie, C. Koedooder, I. Obernosterer. Prokaryotic diversity and activity in contrasting productivity regimes in the Kerguelen region (Southern Ocean) (2021). JMarSys 221

Dinasquet J., E. Bigeard, F. Gazeau, F. Azam, C. Guieu, E. Maranon, C. Ridame, F. Van Wambeke, I. Obernosterer, A.-C. Baudoux. Impact of dust addition on the microbial food web under present and future conditions of pH and temperature. Biogeoscience special Issue: Atmospheric deposition in the low-nutrient-low-chlorophyll (LNLC) ocean: effects on marine life today and in the future. Preprint available, 2021

Gazeau F., C. Ridame, F. Van Wambeke, S. Alliouane, C. Stolpe, J-O. Irisson, S. Marro, J-M. Grisoni, G. De Liège, S. Nunige, K. Djaoudi, E. Pulido-Villena, J. Dinasquet, I. Obernosterer, P. Catala and C. Guieu. (2021) Impact of dust enrichment on Mediterranean plankton communities under present and future conditions of pH and temperature: an experimental overview. Biogeoscience special Issue: Atmospheric deposition in the low-nutrient-low-chlorophyll (LNLC) ocean: effects on marine life today and in the future. Preprint available

Freney E., K. Sellegri, A. Nicossia, L.R. Williams, M. Rinaldi, J. T.Trueblood, A. S.H. Prevot, M. Thyssen, G. Gregori, N. Haentjens, J. Dinasquet, I. Obernosterer, F. Van-Wambeke, A. Engel, Birthe Zäncker, K. Desboeufs, E. Asmi, H. Timmonen and C. Guieu. (2021) Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry. Atmos. Chem. Phys. 21, 1-17.

Trueblood J., A. Nicosia, A. Engel, B. Zäncker, M. Rinaldi, E. Freney, M. Thyssen, I. Obernosterer, J. Dinasquet, F. Belosi, A. Tovar-Sánchez, A. Rodriguez-Romero, G. Santachiara, C. Guieu, and K. Sellegri (2021) A Two-Component Parameterization of Marine Ice Nucleating Particles Based on Seawater Biology and Sea Spray Aerosol Measurements in the Mediterranean Sea. Atmos. Chem. Phys. 21, 4659-4676.

Ortega-Retuerta E., Q. Devresse, J. Caparros, B. Marie, O. Crispi, P. Catala, F. Joux, I. Obernosterer (2020). Dissolved organic matter released by two marine heterotrophic bacterial strains and its bioavailability for natural prokaryotic communities. Environmental Microbiology. DOI: 10.1111/1462-2920.15306

Ratnarajah L., S. Blain, P. W. Boyd, M. Fourquez, I. Obernosterer, A. Tagliabue (2020). Resource colimitation drives competition between phytoplankton and bacteria in the Southern Ocean. Geophysical Research Letters. DOI: 10.1029/2020GL088369

Blain S., M. Rembauville, O. Crispi and I. Obernosterer (2020). Synchronized autonomous sampling reveals coupled pulses of biomass and export of morphologically different diatoms in the Southern Ocean. Limnol. Oceanogr. 9999, 1-12.

Liu Y., S. Blain, O. Crispi, M. Rembauville, I. Obernosterer (2020). Seasonal dynamics of prokaryotes and their associations with diatoms in the Southern Ocean as revealed by an autonomous sampler. Environ. Microbiol. Doi. 10.1111/1462-2920.15184

Ortega-Retuerta E., Q. Devresse, J. Caparros, B. Marie, O. Crispi, P. Catala, F. Joux, I. Obernosterer (2020). Dissolved organic matter released by two marine heterotrophic bacterial strains and its bioavailability for natural prokaryotic communities. Environmental Microbiology. DOI: 10.1111/1462-2920.15306

Christaki U., A. Guenegues, Y. Liu, S. Blain, P. Catala, J. Colombet, P. Debeljak, L. Jardillier, S. Irion,F. Planchon, I. Sassenhagen, T. Sime-Ngando, I. Obernosterer (2020) Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes. Limnol. Oceanogr. doi: 10.1002/lno.11591

Tisserand L, Dadaglio L, Intertaglia L, Catala P, Panagiotopoulos C, Obernosterer I, Joux F. (2020) Use of organic exudates from two polar diatoms by bacterial isolates from the Arctic ocean. Phil. Trans. R. Soc. A 20190356.

Koedooder C., A. Guenegues ,R. Van Geersdaële, F.-Y. Bouget, I. Obernosterer, S. Blain. (2020) The interplay between iron limitation, light, and carbon in the proteorhodopsin-containing Photobacterium angustum S14. FEMS Microbiol. Ecol. 96, fiaa103, doi: 10.1093/femsec/fiaa103

Fourquez M., M. Bressac, S. L. Deppeler, M. Ellwood, I. Obernosterer, T. Trull, P. Boyd (2019). Microbial Competition in the Subpolar Southern Ocean: an Fe-C co-limitation experiment. Front. Mar. Sci. 6:776 doi: 10.3389/fmars.2019.00776

Gonzalez M.-L., S. Blain, I. Obernosterer (2019) Seasonal freshening of NW Mediterranean surface water impacts microbial heterotrophic activity and dissolved organic matter. Estuarine, Coastal and Shelf Sciences. 230, 10644 dot: 10.1016/j.ecss.2019.106448

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.21: 2360-2374. 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. 21 : 1452-1465. 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





Traductions :

    Le LOMIC en chiffres

    8 Chercheurs CNRS
    3 Enseignant-chercheurs

    1 Chercheuse accueillie

    9 Tech/Ingénieurs

    2 Post doctorants

    2 CDD Ingénieur
    12 Etudiants en thèse