Post Doc

Marine Landa

Research interests

I am a marine microbiologist interested in microbial physiology and ecology. I specialize in the interactions between marine bacteria and phytoplankton, with a focus on the molecular processes that shape those relationships. My research combines classical marine microbiology tools, such as microscopic observations or PCR-based analyses, with state-of-the-art sequencing technology to investigate the mechanisms involved in microbial interactions and their effects on microbial metabolism, activity and ecological strategies.

I joined the team in January 2022 under the supervision of Dr. Christian Jeanthon to work on the interactions between algicidal bacteria in the Kordia genus and marine diatoms. This research, funded through the Marie Sklodowska-Curie Actions via the COFUND Bienvenüe program organized by Région Bretagne, will use model Kordia and diatom strains from the Roscoff Culture Collection to investigate the genes and metabolites responsible for Kordia’s algicidal activity towards diatoms.


Professional training and experience

  • Postdoctoral Researcher, University of California Santa Cruz, USA (2017 – 2020)

Ocean Sciences Department, Zehr lab.

Study of the symbiosis between the nitrogen-fixing cyanobacterium UCYN-A and its haptophyte host.


  • Postdoctoral Researcher, University of Georgia, USA (2014 – 2017)

Department of Marine Sciences, Moran lab.

Study of the metabolic interactions between model Roseobacter bacteria and marine phytoplankton.


  • PhD student, Observatoire Océanologique de Banyuls-sur-mer (2010 – 2013)

LOMIC (UMR7621, CNRS/UPMC) – supervisor : Dr. Ingrid Obernosterer.

Study of the link between dissolved organic matter and diversity of heterotrophic marine bacteria



*Landa M, Turk-Kubo K, Cornejo-Castillo F, Henke B and Zehr J (2021). Critical role of light in the growth and activity of the marine N2-fixing UCYN-A symbiosis. Frontiers in Microbiology, 12:666739. doi: 10.3389/fmicb.2021.666739.

*Sarkar D, Landa M, Bandyopadhyay A, Pakrasi H, Zehr P and Maranas C (2021). Elucidation of trophic interactions in an unusual single-cell nitrogen-fixing symbiosis using metabolic modeling. PLoS Computational Biology, 17(5): e1008983.

*Landa M, Burns A, Durham B, Esson K, Nowinski B, Sharma S, Vorobev A, Nielsen T, Kiene R and Moran MA (2019). Sulfur metabolites that facilitate oceanic phytoplankton-bacteria carbon flux. ISME Journal, 13:2536–2550.

*Nowinski B, Motard-Côté J, Landa M, Preston C, Scholin C, Birch J, Kiene R and Moran MA (2019). Microdiversity and temporal dynamics of marine bacterial dimethylsulfoniopropionate genes. Environmental Microbiology, 21:1687-1701.

*Landa M, Blain S, Harmand J, Monchy S, Rapaport A and Obernosterer I (2018). Major changes in the composition of a Southern Ocean bacterial community in response to diatom-derived dissolved organic matter. FEMS Microbiology Ecology, 94(4) – fiy034.

*Landa M, Burns A, Roth S and Moran MA (2017). Bacterial transcriptome remodeling during sequential co-culture with a marine dinoflagellate and diatom. ISME Journal, 11:2677-2690.

*Satinsky B, Smith C, Sharma S, Landa M, Medeiros P, Coles V, Yager P, Crump B and Moran MA (2017). Expression patterns of elemental cycling genes in the Amazon river plume. ISME Journal, 11:1852-1864.

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

*Landa M, Cottrell MT, Kirchman DL, Kaiser K, Medeiros PM, Tremblay L, Batailler N, Caparros J, Catala P, Escoubeyrou K, Oriol L, Blain S and Obernosterer I (2014). Phylogenetic and structural response of heterotrophic bacteria to dissolved organic matter of different chemical composition in a continuous culture study. Environmental Microbiology, 16(6):1668-1681.

*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.

*Landa M, Cottrell MT, Kirchman DL, Blain S and Obernosterer I (2013). Changes in bacterial diversity in response to dissolved organic matter supply in a continuous culture experiment. Aquatic Microbial Ecology, 69:157-168.