Affiliation entity
CCE Cyanobacteria, Cyanotoxins and Environment
Interdisplinary research theme
Ecotoxicology of Cyanobacteria
Researches
Accreditation to supervise research
Speciality
Ecotoxicology of Cyanobacteria

Contact

Social networks
E-mail
cecile.bernard [at] mnhn.fr
Phone
01 40 79 31 83
Address(es)

12 rue Buffon
75005 Paris

Responsibilities outside unit

Involvement in local research management :

  • Director of Research, Muséum National d’Histoire Naturelle (2020-2024)
  • Team of the “Cyanobacteria, Cyanotoxins, and the Environment” team, UMR7245 MNHN–CNRS MCAM (2007–2019)

Involvement in research management at national level :

  • Appointed member of Section 31 of the National Committee for Scientific Research (2025–…)
  • UNESCO Expert on Harmful Algal Blooms and Cyanobacteria (2025–…)
  • Appointed member of Section 20 of the French National Scientific Research Committee (2004-2012)
  • Appointed member of the Bureau of Section 20 (2007-2012)
  • Member of GT9 Allenvi “Environmental, natural and ecotoxic risks” for CNRS & MNHN (2010-2016)
  • Member of the Scientific Council of ED EPHE (2011-2019)
  • MNHN representative on the Academic Senate of PRES Sorbonne Universités (2011-2014)
  • Member of the Scientific Committee of the microbial thematic action of the EC2CO national program of the Institut National des Sciences de l’Univers, SIC division (Surfaces et Interfaces Continentales) of the CNRS (2007-2011 and 2015- 2020)
  • Board member of the RTP Ecotoxicomic (2015-2019)

 

Leadership and/or participation in research programs :

  • National programs: EC2CO, ANSES (2), R2DS, DGS, Programme National Arcachon (resp. task), ANR CYANOTOX_SEST (carrier), ANR PULSE_CEP&S (resp. task), ANR DZIANI (resp. task), ANR CYPHER (carrier) ; ANR SUBSILAKE (coord. for MNHN)
  • Industrial or regional partnership: Conseil Département de Seine Saint Denis, Veolia environnement, SEDIF, Algama, Thermes de Balaruc les Bains.

Involvement with the Museum’s collections:

  • Head of the MNHN’s Biological Resources: Live and Cryopreserved Cells collection. This collection comprises five MNHN collections, including those of live microorganisms, cryopreserved cells, and the Chemical Library. (2010–2020) 
  • Curator of the microalgae and live cyanobacteria collection at USM 505/EA 4105. (2000–2010)


Involvement in the Museum’s educational programs:

  • Co-director of the Master 2 program “Microorganisms, Environment, and Health” (MES), MNHN and SUhttp://mes.obs-banyuls.fr/fr/index.html (2015–2020)
  • Co-director of the Master 2 program “Toxins, Microorganisms, and Communication Molecules in Ecosystems” (TMMCE) at MNHN’s “Evolution, Natural Heritage, and Societies” department, specializing in the Unit for the Diversity of Life (UDV) (2008–2014)
  • Research Master’s program “Toxins and Ecosystems” (TE) at MNHN “Evolution, Natural Heritage, and Societies,” specializing in the Living Diversity Unit (UDV), (averaging 20 teaching hours equivalent to tutorials per year). (2005–2007)
  • Co-director of the UDV “Microorganism and Plant Toxins: Modes of Action and Biotechnologies” with Prof. D. Gillet (CEA, Director of the TE Master’s program). (2005–2007)
  • Coordinator of a course at the MNHN Doctoral School. (1997–2003)
  • Director of continuing education courses at the MNHN (average of 30 teaching hours equivalent to tutorial sessions per year). (1997–2003)

     

Presentation

Research activities

My research activities, through the supervision of thesis students and the promotion of research in several national and international programs, are centered around several items:

  • DIVERSITY OF PHYTOPLANKTON, CYANOBACTERIA AND CYANOTOXINS

By combining several approaches: morphological characteristics observable by light or electron microscopy, molecular characteristics that provide information on the phylogeny of the taxa studied, and diversity of functions (e.g. metabolites and molecules). The description and conservation of this diversity is a key activity of UMR7245 and the MNHN.

The databases obtained support scientific questions concerning the taxonomic and functional diversity of phytoplankton on several scales: local (water body), regional (Ile de France) and global (several regions of the world).

  • FACTORS CONTROLLING CYANOBACTERIAL DYNAMICS AND TOXIN PRODUCTION

On a regional (e.g. Ile de France) or local (e.g. Lac Dziani, Mayotte) scale, the environmental contexts for the development of cyanobacteria and cyanotoxins are studied and analyzed using statistical modeling approaches that bring into play variables combining the morphological characteristics of water bodies and the nature of their catchment areas, geochemical, meteorological and biological characteristics (e.g. diversity of microbial communities and interactions).

  • TOXICOLOGICAL EFFECTS OF CYANOBACTERIA

These are studied in several models (from enzymatic tests and cell lines to medaka). The complementary nature of these models makes it possible not only to identify toxicity linked to the presence of clearly identified cyanotoxins, but also to characterize their mode of action through the characterization of targets using synergistic or competitive molecules.

  • SCIENTIFIC EXPERTISE IN RESPONSE TO SOCIETAL REQUEST

Real-time monitoring and warning systems have been developed to manage the risks associated with cyanobacteria blooms and toxin production. Based on well-defined decision trees, decision support is provided to water body managers regarding the use of contaminated water bodies (drinking water, recreational activities or fish farming).

CV

2025-12 CV_C Bernard_0.pdf Format (Pdf) - 669.18 KB

Publications

2026
  • Dechaux Noémie, Guérin Nina, Thiney Najet, Escoubeyrou Karine, Duval Charlotte, Fiorini Sarah, Paulin Charles-Hubert, et al. 2026. “Synergistic Interactions Between Biogenic Organic Matter and Microbial Dynamics During Simulated Senescent Cyanobacterial Blooms in Freshwater Mesocosms”. Frontiers in Microbiomes 5 (July). Frontiers. doi:10.3389/frmbi.2026.1866641.
    ISSN
    2813-4338
  • Duperron Sébastien, Foucault Pierre, Vern Amaury Le, Goto Midoli, Duval Charlotte, Marie Benjamin, Hamlaoui Sahima, et al. 2026. “Higher Trophic Status Leads to More Diverse and Divergent Microeukaryote Communities Over Time in Urban Lakes From the Greater Paris (France)”. Environmental Microbiology Reports 18 (June): e70355. doi:10.1111/1758-2229.70355.
    ISSN
    1758-2229
  • Roussel Théotime, Quiquand Manon, Duval Charlotte, Cadoret Jean-Paul, Yéprémian Claude, Le Vern Amaury, Marie Benjamin, and Bernard Cécile. 2026. “Efficient Selection of New Limnospira Platensis Strains (spirulina) for Biomass and High-Value Molecule Production”. Journal of Applied Phycology, May. doi:10.1007/s10811-026-03866-0.
    ISSN
    1573-5176
2025
  • Foucault Pierre, Halary Sébastien, Duval Charlotte, Goto Midoli, Marie Benjamin, Hamlaoui Sahima, Jardillier Ludwig, et al. 2025. “A Summer in the Greater Paris: Trophic Status of Peri-Urban Lakes Shapes Prokaryotic Community Structure and Functional Potential”. Environmental Microbiome 20 (February): 24. doi:10.1186/s40793-025-00681-x.
    ISSN
    2524-6372
  • Roussel Théotime, Hubas Cédric, Halary Sébastien, Chynel Mathias, Duval Charlotte, Cadoret Jean-Paul, Meziane Tarik, et al. 2025. “Limnospira (Cyanobacteria) Chemical Fingerprint Reveals Local Molecular Adaptation”. Microbiology Spectrum, January, e01901–24. doi:10.1128/spectrum.01901-24.
2024
  • Vigneron Adrien, Cloarec Lilian A., Agogué Hélène, Bernard Cécile, Duperron Sébastien, Leboulanger Christophe, Carré Claire, et al. 2024. “Seismic Events As Potential Drivers of the Microbial Community Structure and Evolution in a Paleo-Ocean Analog”. Communications Earth & Environment 5 (September): 1–9. doi:10.1038/s43247-024-01615-0.
    ISSN
    2662-4435
  • Duperron Sébastien, Halary Sébastien, Bouly Jean-Pierre, Roussel Théotime, Hugoni Myléne, Bruto Maxime, Oger Philippe M., et al. 2024. “Transcriptomic Insights into the Dominance of Two Phototrophs Throughout the Water Column of a Tropical Hypersaline-Alkaline Crater Lake (Dziani Dzaha, Mayotte)”. Frontiers in Microbiology 15 (April). doi:10.3389/fmicb.2024.1368523.
    ISSN
    1664-302X
  • Halary Sébastien, Duval Charlotte, Marie Benjamin, Bernard Cécile, Piquet Bérénice, Gros Olivier, Bourguet-Kondracki Marie-Lise, and Duperron Sébastien. 2024. “Genomes of Nine Biofilm-Forming Filamentous Strains of Cyanobacteria (genera Jaaginema, Scytonema, and Karukerafilum Gen. Nov.) Isolated from Mangrove Habitats of Guadeloupe (Lesser Antilles)”. FEMS Microbes 5 (January): xtad024. doi:10.1093/femsmc/xtad024.
    ISSN
    2633-6685
2023
  • Bruto Maxime, Oger Philippe M., Got Patrice, Bernard Cécile, Melayah Delphine, Cloarec Lilian A., Duval Charlotte, et al. 2023. “Phytoplanktonic Species in the Haloalkaline Lake Dziani Dzaha Select Their Archaeal Microbiome”. Molecular Ecology, October. doi:10.1111/mec.17179.
    ISSN
    1365-294X
  • Roussel Théotime, Halary Sébastien, Duval Charlotte, Piquet Bérénice, Cadoret Jean-Paul, Vernès Léa, Bernard Cécile, and Marie Benjamin. 2023. “Monospecific Renaming Within the Cyanobacterial Genus Limnospira (Spirulina) and Consequences for Food Authorization”. Journal of Applied Microbiology 134 (August): lxad159. doi:10.1093/jambio/lxad159.
    ISSN
    1364-5072