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Laboratoire d'Océanographie Microbienne
UMR 7621

Ingrid Obernosterer




 Dr. Obernosterer Ingrid

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 ; Fax: 33 (0)4 68 88 73 98

E-mail: obernosterer @


2004-present: CNRS research scientist

2002-2004 Post-doctoral fellow at the Laboratoire d'Océanographie Biologique in Banyuls (Supervisor P. Lebaron)

2001-2002 Post-doctoral fellow at the Univ. of South Carolina, USA (Supervisor R. Benner)

2000 PhD Thesis Defense at the University of Groningen, The Netherlands (Supervisor G. Herndl)

1994 MSc at the Univ of Vienna, Dept. of Marine Biology, Austria; Supervisor Gerhard Herndl


Her main research topic is the bioavailability of marine dissolved organic matter (DOM) to heterotrophic prokaryotes and how this impacts the marine carbon cycle. More recently, she has integrated the study of prokaryotic diversity to better understand the cycling of various sources of DOM. Integrated to this work are photochemical transformations of DOM and the study of the sea surface microlayer. She is presently conducting her research in the oligotrophic Mediterranean Sea, and in the Southern Ocean in the context of natural iron fertilization. Her most recent research projects are BACCIO, DUNE ( fenêtre, LATEX ( fenêtre),  KEOPS2 ( and SOCLIM (



62. 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 

61. Lasbleiz M., K. Leblanc, L. Armand, U. Christaki, C. Georges, I. Obernosterer, B. Quéguiner Composition 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

60. 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

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

58. 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

59. Landa M., Blain S., Christaki U., Monchy S., Obernosterer I. (2015) Shifts in bacterial community composition associated with increased carbon cycling in a mosaic of phytoplankton blooms ISME J. doi: 10.1038/ismej.2015.105 (IF: 9.27)

58. 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 doi:10.1111/1758-2229.12267 (IF: 3.5).

57. Beier S., Rivers A.R., Moran M.A., Obernosterer I. (2015) Phenotypic plasticity in heterotrophic marine microbial communities. ISME J 9(5):1141-51 (IF: 9.27)

56. Beier S., Rivers, A.R., Moran M.A., Obernosterer I. (2014) The transcriptional response of prokaryotes to phytoplankton-derived DOM in seawater. Environ Microbiol doi/ 10.1111/1462-2920.12434 (IF: 6.5)

55. 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. (2014) Iron budgets for three distinct biogeochemical sites around the Kerguelen archipelago (Southern Ocean) during the natural fertilisation experiment KEOPS-2. BGD 11: 17861-17923.

54. Obernosterer I., M. Fourquez, S. Blain (2014) Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off Kerguelen Islands. BGD 11: 15733-15752. Accepted.

53. Fourquez M., I. Obernosterer, D. Davies, T. Trull, S. Blain (2014). Microbial iron uptake in the naturally fertilized waters in the vicinity of Kerguelen Islands: phytoplankton-bacteria interactions. BGD 11: 15053-15086. Accepted

52. 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).

51. 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 (IF: 4.64).

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 ironfertilized Kerguelen area (Southern Ocean) Biogeosciences 11, 6739-6753 (IF: 4.64).

49. 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 (IF: 4.64).

48. Salter I., P. E. Galand, S. K. Fagervold, P. Lebaron, I. Obernosterer, M. Oliver, M.T. Suzuki, C. Tricoire (2014) Seasonal dynamics of active SAR11 ecotypes in the oligotrophic Northwest Mediterranean Sea. ISMEJ doi: 10.1038/ismej.2014.129 (IF: 9.27).

47. 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 (IF: 4.64).

46. 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 (IF: 4.004)

45. 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 (IF: 6.5)

44. 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 (IF: 4.64).

43. 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 (IF : 2.548).                       

42. 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 (IF : 2.044)

41. Laghdass M., P. Catala, J. Caparros, L. Oriol, P. Lebaron and I. Obernosterer (2012) High contribution of SAR11 to microbial activity in the North West Mediterranean Sea Microb Ecol 63: 324-333 (IF: 3.464)

40. 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 (IF: 4.004)

39. 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 (IF : 2.548)

38. 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 (IF : 4.529)

37. Laghdass M., N.J. West, N. Batailler, J. Caparros, P. Catala, F. Lantoine, L. Oriol, P. Lebaron and 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 (IF: 3.01)

36. Obernosterer I., 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 (IF: 3.464)

35. 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 (IF : 2.548)

34. 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 (IF: 4.064)

33. 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 (IF: 4.064)

32. 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 (IF: 4.064)

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 (IF: 5.638)

30. 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 (IF: 2.149)

29. 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 (IF: 2.149)

28. 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 (IF: 2.149)

27. 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 (IF: 2.149) 

26. 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 (IF: 2.149)

25. 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 (IF: 2.149)

24. Sarthou G., 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(IF: 2.149)

23. 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 (IF: 28.751)

22. 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 (IF: 4.529)

21. 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 (IF: 2.548)

20. 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 (IF: 2.548)

19. 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 (IF : 3.939)

18. Agogué H., F. Joux, I. Obernosterer and P. Lebaron (2005) Resistance of Marine Bacterioneuston to Solar Radiation. Appl Environ Microb 71: 5282-5289 (IF: 4.529)

17. Obernosterer I. and R. Benner (2004) Competition between biological and photochemical processes in the mineralization of dissolved organic carbon. Limnol Oceanogr 49: 117-124 (IF: 3.024)

16. 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 (IF: 3.024)

15. 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 (IF: 2.116)

14. 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 (IF: 1.756)

13. 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 (IF: 2.342)

12. 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 (IF: 3.169)

11. 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 (IF: 3.169)

10. 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 (IF: 2.342)

9.  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 (IF: 3.169)

8.  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 (IF: 2.241)

7. 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 (IF: 2.179)

6. 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 (IF: 3.691)

5. 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 (IF: 2.222)


Book Chapters

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

3. 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.



2. 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

1. 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


Traductions :

    Le LOMIC en chiffres

    6 Chercheurs CNRS
    4 Enseignant-chercheurs
    8 Personnels techniques
    4 Post doctorants
    8 Etudiants en thèse

    4 Etudiants Master2