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Laboratoire d'Océanographie Microbienne
UMR 7621




Directrice de Recherche DR2 CNRS

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

Avenue Fontaulé - 66650 Banyuls sur mer, France

Tél: 33 (0)4 68 88 73 53

E-mail: obernosterer @


Research ID: A-5434-2011

Ingrid Obernosterer

Senior Research Scientist – DR CNRS

Education :

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

M.S. 1994, University of Vienna, Austria

Research Interests

Microbial oceanography and microbial ecology, bacterial roles in the marine carbon and iron cycles,  metatranscriptomics in the Southern Ocean, dissolved organic matter and bacteria interactions, understanding links between structure and function of microbial communities

PhD Students

Pavla Debeljak

Yan Liu

PostDocs :

Eva Ortega-Retuerta

Julie Dinasquet



  1. 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 
  2. Lasbleiz M., K. Leblanc, L. Armand, U. Christaki, C. Georges, I. Obernosterer, B. QuéguinerComposition of diatom communities and their contribution to plankton biomass in the naturally iron fertilized region of Kerguelen in the Southern Ocean (2016). FEMS Microbiology Ecology 92, fiw171
  3. 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.
  4. 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
  5. 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
  6. Beier S., Rivers A.R., MoranM.A., Obernosterer I. (2015) Phenotypic Plasticity in Heterotrophic Marine Microbial Communities. ISMEJ 9: 1141-1151
  7. 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.
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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 50. 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
  13. Malits A., Christaki U., 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. Giovagnetti,V., C. Brunet, F. Conversano, F. Tramontano, I. Obernosterer, C. Ridame, and C. Guieu (2013). Assessing the role of dust deposition on phytoplankton ecophysiology and succession in a low-nutrient low-chlorophyll ecosystem: a mesocosm experiment in the Mediterranean Sea. Biogeosciences 10: 2973-2991
  19. Landa, M., M. Cottrell, D. Kirchman, S. Blain and I. Obernosterer (2013). Changes in bacterial diversity in response to dissolved organic matter supply in a continuous culture experiment. Aquat Microb Ecol. 69 : 157-168                                                                                   
  20. Fourquez, M., I. Obernosterer and S. Blain (2012) A method for the use of the radiotracer 55Fe for microautoradiography and CARD-FISH of natural bacterial communities. FEMS Microbiol Lett. DOI: 10.1111/1574-6968.12022 (
  21. LaghdassM., P. Catala, J. Caparros, L. Oriol, P. Lebaronand I. Obernosterer (2012) High contribution of SAR11 to microbial activity in the North West Mediterranean Sea Microb Ecol 63: 324-333
  22. Obernosterer I., P. Catala, P. Lebaron and N. West (2011) Distinct bacterial groups drive carbon cycling during a phytoplankton bloom induced by natural iron fertilization in the Southern Ocean. Limnol Oceanogr 55: 2391-2401
  23. Laghdass M., S. Blain, M. Besseling, P. Catala, C. Guieu and I. Obernosterer (2011) Effect of Saharan dust on the microbial community during a large in situ mesocosm experiment in the NW Mediterranean Sea. Aquat Microb Ecol 62 : 201-213
  24. Guillebault D., M. Laghdass, P. Catala, I. Obernosterer and P. Lebaron (2010) Improved method for bacterial cell capture after flow cytometry cell sorting. Appl Environ Microbiol 76 : 7352-7355
  25. Laghdass M., N.J. West, N. Batailler, J. Caparros, P. Catala, F. Lantoine,L. Oriol, P. Lebaronand I. Obernosterer (2010). Impact of lower salinity water masses on bacterial heterotrophic production and community structure in the offshore NW Mediterranean Sea. EMIR, 2: 761-769
  26. ObernostererI., R. Lami, M. Larcher, N. Batailler, P. Catala and P. Lebaron (2010). Linkage between bacterial carbon processing and the structure of the active bacterial community at a coastal site in the NW Mediterranean Sea. Microb Ecol 59: 428-435
  27. Lamy, D., I. Obernosterer, M. Laghdass, F. Artigas, E. Breton, J.D. Grattepanche, E. Lecuyer, N. Degros, P. Lebaron and U. Christaki (2009) Temporal changes of major bacterial groups and bacterial heterotrophic activity during a Phaeocystis globosa bloom in the eastern English Channel. Aquat Microb Ecol 58: 95-107
  28. Obernosterer I., P. Catala, R. Lami, J. Caparros, J. Ras, A. Bricaud, C. Dupuy, F. van Wambeke and P. Lebaron (2008)Biochemical characteristics and bacterial community structure of the sea surface microlayer in the South Pacific Ocean. Biogeosciences 5: 693-705
  29. Van Wambeke, F., I. Obernosterer, T. Moutin,S. Duhamel,O. Ulloa and H. Claustre(2008) Heterotrophic bacterial production in the South East Pacific: longitudinal trends and coupling with primary production. Biogeosciences 5: 353-369
  30. Claustre, H., Y. Huot, I. Obernosterer, B. Gentili, D. Tailliez and M. Lewis (2008) Gross community production and metabolic balance in the South Pacific Gyre, using a non-intrusive bio-optical method. Biogeosciences 5:463-474
  31. West N.J., I. Obernosterer, O. Zemb and P. Lebaron (2008) Major differences of bacterial diversity and activity inside and outside of a natural iron-fertilized phytoplankton bloom in the Southern Ocean. Environ Microbiol 10:738-756
  32. Obernosterer I., U. Christaki, D. Lefèvre, P. Catala, F. Van Wambeke and P. Lebaron (2008) Rapid Mineralization Of Organic Carbon Produced During A Phytoplankton Bloom Induced By Natural Iron Fertilization. Deep Sea Res Part II 55: 777-789
  33. Christaki U., I. Obernosterer, F. Van Wambeke, M. Veldhuis, N. Garcia and P. Catala (2008) Microbial Food Web Structure In A Naturally Iron Fertilized Area in the Southern Ocean (Kerguelen Plateau). Deep Sea Res Part II 55: 706-719
  34. Lefèvre D., C. Guigue and I. Obernosterer (2008) The metabolic balance during a phytoplankton bloom induced by natural iron fertilization in the Southern Ocean (Kerguelen Plateau). Deep Sea Res Part II 55: 766-776
  35. Belviso S., L. Bopp, J. Mosseri, M. Tedetti, N. Garcia, B. Griffiths, F. Joux, I. Obernosterer, J. Uitz and M. Veldhuis (2008) Effect of iron fertilisation from below on the distribution of DMS and DMSP in the Indian sector of the Southern Ocean. Deep Sea Res Part II 55: 893-900
  36. Jacquet S.H.M., F. Dehair, N. Savoye, I. Obernosterer, U. Christaki, C. Monnin and D. Cardinal (2008) Mesopelagic organic carbon remineralization in the Kerguelen Plateau region tracked by biogenic particulate Ba. Deep Sea Res Part II 55: 868-879
  37. Jouandet M.P., S. Blain, N. Metzl, C. Brunet, T. Trull and I. Obernosterer (2008) A seasonal carbon budget for a naturally-iron fertilized bloom over the Kerguelen Plateau in the Southern Ocean. Deep Sea Res Part II 55: 856-867
  38. SarthouG., D. Vincent, U. Christaki, I. Obernosterer, K.R. Timmermans and C.P.D. Brussaard (2008) The fate of biogenic iron during a phytoplankton bloom induced by natural fertilization: Impact of copepod grazing. Deep Sea Res Part II 55: 734-751
  39. Blain S, Quéguiner B,  Armand LK, Belviso S , Bombled B, Bopp L, Bowie A, Brunet C, Brussaard C, Carlotti F, Christaki U, Shreeve RS, Corbière A, Durand I, Ebersbach F, Fuda JL, Garcia N, Gerringa L, Griffiths B, Guigue C, Guillerm C, Jacquet S,  Jeandel C, Laan P, Lefèvre D, Lomonaco C, Malits A, Mosseri J, Obernosterer I, Park HY, Picheral M, Pondaven P, Remenyi T, Sandroni V, Sarthou G, Savoye N, Scouarnec L, Souhaut M, Thuiller D, Timmermans K, Trull T, Uitz J, Van-Beek P, Veldhuis M, Vincent D, Viollier E, Vong L, Wagener T (2007) Impact Of Natural Iron Fertilisation On Carbon Sequestration In The Southern Ocean. Nature 446:1070-1074
  40. Lami R., M.T. Cottrell, H. Claustre, O. Ulloa, I. Obernosterer, J. Ras, D.L. Kirchman and P. Lebaron (2007) High Abundances of Aerobic Anoxygenic Photosynthetic Bacteria in the South Pacific Ocean. Appl Environ Microbiol 73: 4198-4205
  41. Joux F., H. Agogué, I. Obernosterer, C. Dupuy, T. Reinthaler, G.J. Herndl and P. Lebaron (2006) Microbial community structure in the sea surface microlayer at two contrasting coastal sites in the northwestern Mediterranean Sea. Aquat Microb Ecol 42:91-104
  42. Obernosterer I., P. Catala, T. Reinthaler, G.J. Herndl and P. Lebaron (2005) Enhanced heterotrophic activity in the surface microlayer of the Mediterranean Sea. Aquat Microb Ecol 39 : 293-302
  43. Agogué H., E.O. Casamayor, M. Bourrain, I. Obernosterer, F. Joux, G.J. Herndl and P. Lebaron (2005). A survey on bacteria inhabiting the sea surface microlayer of coastal ecosystems. FEMS Microbiol Ecol 54: 269-280
  44. Agogué H., F. Joux, I. Obernosterer and P. Lebaron (2005) Resistance of Marine Bacterioneuston to Solar Radiation. Appl Environ Microb 71: 5282-5289
  45. Obernosterer I. and R. Benner (2004) Competition between biological and photochemical processes in the mineralization of dissolved organic carbon. Limnol Oceanogr 49: 117-124
  46. Agogué H., E.O. Casamayor, F. Joux, I. Obernosterer, C. Dupuy, F. Lantoine, P. Catala, M.G. Weinbauer, T. Reinthaler, G.J. Herndl and P. Lebaron (2004) Comparison of samplers for the biological characterization of the sea surface microlayer. Limnol Oceanogr Methods  2:213-225
  47. Obernosterer, I., N. Kawasaki and R. Benner (2003) P limitation of respiration in the Sargasso Sea and uncoupling of bacteria from P regeneration in size-fractionation experiments. Aquat Microb Ecol 32: 229-237
  48. Panagiotopoulos, C., R. Sempéré, I. Obernosterer, L. Striby, M. Goutx, F. Van Wambeke, S. Gautier and R. Lafont (2002) Bacterial degradation of large particles in the southern Indian Ocean using in vitro incubation experiments. Org Geochem. 33: 985-1000
  49. Obernosterer, I. R. Sempéré and G.J. Herndl (2001) Ultraviolet radiation induces a reversal of the bioavailability of DOM to marine bacterioplankton. Aquat Microb Ecol 24: 61-68
  50. Obernosterer, I., P. Ruardij and G.J. Herndl (2001) Spatial and diurnal dynamics of dissolved organic matter (DOM) fluorescence and H2O2 and the photochemical oxygen demand of surface water DOM across the subtropical Atlantic Ocean. Limnol Oceanogr 46: 632-643
  51. Obernosterer, I. and G.J. Herndl (2000) Differences in the optical and biological reactivity of the humic and non-humic DOC component in two contrasting coastal marine environments. Limnol Oceanogr 45: 1120-1129
  52. Obernosterer, I., G. Kraay, E. De Ranitz and G.J. Herndl (1999) Concentrations of low molecular weight carboxylic acids and carbonyl compounds in the Aegean Sea (Eastern Mediterranean) and the turnover of pyruvate. Aquat Microb Ecol 20: 147-156
  53. Obernosterer, I., B. Reitner and G.J. Herndl (1999) Contrasting effects of solar radiation on dissolved organic matter and its bioavailability to marine bacterioplankton. Limnol Oceanogr 44: 1645-1654
  54. Boelen, P., I. Obernosterer, A. Vink and A.G.J. Buma (1999) Attenuation of biologically effective UV radiation in tropical Atlantic waters measured with a biochemical DNA dosimeter. Photochem Photobiol 69: 34-40
  55. Brugger, A., D. Slezak, I. Obernosterer and G.J.Herndl (1998) Photolysis of dimethyl sulfid in coastal waters: Dependence on substrate concentration, irradiance and DOC content. Mar Chem 59: 321-331
  56. Sommaruga, R., I. Obernosterer, G.J. Herndl and R. Psenner (1997) Inhibitory effect of solar radiation on thymidine and leucine incorporation by freshwater and marine bacterioplankton. Appl Environ Microbiol 63: 4178-4184
  57. Obernosterer, I. and G.J. Herndl (1995) Phytoplankton extracellular release and bacterial growth: dependence on the inorganic N:P ratio. Mar Ecol Prog Ser 116: 247-257

Book Chapters

Herndl, G.J. and I. Obernosterer (2002). UV radiation and pelagic bacteria. In: UV Radiation and Arctic Ecosystems [ed] Hessen, D. Springer-Verlag.

Herndl, G.J., A. Brugger, S. Hager, E. Kaiser, I. Obernosterer, B. Reitner and D. Slezak (1996) Role of ultraviolet-B radiation on bacterioplankton and the availability of dissolved organic matter. In: UV-B and biosphere. [eds.] J. Rozema, W.W.C. Gieskes, S.C. van de Geijn, C. Nolan and H. de Boois. Kluwer, Academic Press


Obernosterer, I., G. J. Herndl and P. Lebaron (2005) Bacterial heterotrophic activity in the sea surface microlayer of the coastal Mediterranean Sea. CIESM Workshop Monographs 28 :81-85

Herndl, G. J., J. M. Arrieta, I. Obernosterer and B. Reitner (1998) Role of ultraviolet radiation in the Mediterranean Sea: interaction between mixing processes, photochemistry and microbial activity. Rapp. Comm. Int. Mer Medit. 35: 24-27


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    Le LOMIC en chiffres

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