Affiliation entity
CCE Cyanobacteria, Cyanotoxins and Environment
Thème interdisciplinaire de recherche
Ecotoxicology of Cyanobacteria
Accreditation to supervise research
Ecotoxicology of Cyanobacteria


Social networks
cecile.bernard [at]
01 40 79 31 83

12 rue Buffon
75005 Paris

Responsibilities outside unit

Involvement in local research management :

2020 - ... Director of Research, Muséum National d'Histoire Naturelle

Direction Générale Déléguée à la Recherche, l'Expertise, la Valorisation et l'Enseignement-formation (DGD REVE), 57 rue Cuvier - CP 17 - 75231 Paris Cedex 05 - France

The mission of the Director of Research for the establishment consists of :

  • Contribute to the definition of the establishment's research policy, within the framework of the objectives of the five-year contract and the partnership policy led by the DGD-REVE and the Presidency, and based on the opinions of the establishment's statutory bodies.
  • Implement the establishment's research policy by: i) accentuating the development of research interfaces with other areas of activity within the Museum's statutory mission; ii) stimulating and supporting cross-disciplinary work between departments; iii) increasing research resources.- Support and coordinate the activities of the Museum's analytical platform (PAM) and research support units,
  • Prepare and monitor the Research Department's budget within DGD REVE.
  • Set up and monitor research indicators.
  • Represent the institution's research policy as required.


Involvement in research management at national level :

  • 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.




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:


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).


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).


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.


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 de Cécile Bernard Format (Pdf) - 151.04 KB


  • Bruto Maxime, Oger Philippe M., Got Patrice, Bernard Cécile, Melayah Delphine, Cloarec Lilian A., Duval Charlotte, Escalas Arthur, Duperron Sébastien, Guigard Ludivine, Leboulanger Christophe, Ader Magali, Sarazin Gerard, Jézéquel Didier, Agogué Hélène et al., October 2023Phytoplanktonic species in the haloalkaline Lake Dziani Dzaha select their archaeal microbiome. Microorganisms are key contributors of aquatic biogeochemical cycles but their microscale ecology remains largely unexplored,… Molecular Ecology , ,
  • Roussel Théotime, Halary Sébastien, Duval Charlotte, Piquet Bérénice, Cadoret Jean-Paul, Vernès Léa, Bernard Cécile & Marie Benjamin, August 2023Monospecific renaming within the cyanobacterial genus Limnospira (Spirulina) and consequences for food authorization. The cyanobacterial genus, Limnospira (anc. Arthrospira Stizenberger ex Gomont 1892), commonly called “Spirulina”, is widely… Journal of Applied Microbiology vol. 134, n° 8, lxad159
  • Halary Sébastien, Duperron Sébastien, Kim Tiam Sandra, Duval Charlotte, Bernard Cécile & Marie Benjamin, June 2023Intra-population genomic diversity of the bloom-forming cyanobacterium, Aphanizomenon gracile, at low spatial scale. Cyanobacteria are oxygenic photosynthetic bacteria that perform a substantial part of the global primary production. Some… ISME Communications vol. 3, n° 1, p. 1-4 Number: 1 Publisher: Nature Publishing Group
  • Wang Huibin, Halary Sébastien, Duval Charlotte, Bernard Cécile, Troussellier Marc, Beniddir Mehdi A., Brunel Jean-Michel, Castaldi Andrea, Caudal Flore, Golléty Claire, Martin Coralie, Bourguet-Kondracki Marie-Lise & Duperron Sébastien, 2023Diversity, metabolome profiling and bioactivities of benthic filamentous cyanobacteria isolated from coastal mangroves of Mayotte. IntroductionCyanobacteria are important members of the dense biofilms that colonize available substrates in mangrove habitats… Frontiers in Marine Science vol. 10, ,
  • Halary Sébastien, Duperron Sébastien, Demay Justine, Duval Charlotte, Hamlaoui Sahima, Piquet Bérénice, Reinhardt Anita, Bernard Cécile & Marie Benjamin, December 2022Metagenome-Based Exploration of Bacterial Communities Associated with Cyanobacteria Strains Isolated from Thermal Muds. Cyanobacteria constitute a pioneer colonizer of specific environments for whom settlement in new biotopes precedes the… Microorganisms vol. 10, n° 12, p. 2337 Number: 12 Publisher: Multidisciplinary Digital Publishing Institute
  • Gaëtan Juliette, Halary Sébastien, Millet Maxime, Bernard Cécile, Duval Charlotte, Hamlaoui Sahima, Hecquet Amandine, Gugger Muriel, Marie Benjamin, Mehta Neha, Moreira David, Skouri-Panet Fériel, Travert Cynthia, Duprat Elodie, Leloup Julie et al., December 2022Widespread formation of intracellular calcium carbonates by the bloom-forming cyanobacterium Microcystis. The formation of intracellular amorphous calcium carbonates (iACC) has been recently observed in a few cultured strains of… Environmental Microbiology , ,
  • Olokotum Mark, Humbert Jean-François, Quiblier Catherine, Okello William, Semyalo Ronald, Troussellier Marc, Marie Benjamin, Baumann Kathrin, Kurmayer Rainer & Bernard Cécile, September 2022Characterization of Potential Threats from Cyanobacterial Toxins in Lake Victoria Embayments and during Water Treatment. Africa’s water needs are often supported by eutrophic water bodies dominated by cyanobacteria posing health threats to riparian… Toxins vol. 14, n° 10, p. 664
  • Kim Tiam Sandra, Comte Katia, Dalle Caroline, Delagrange Marine, Djediat Chakib, Ducos Bertrand, Duval Charlotte, Feilke Kathleen, Hamlaoui Sahima, Le Manach Séverine, Setif Pierre, Yéprémian Claude, Marie Benjamin, Kirilovsky Diana, Gugger Muriel et al., August 2022The success of the bloom-forming cyanobacteria Planktothrix: Genotypes variability supports variable responses to light and temperature stress. Cyanobacterial blooms can modify the dynamic of aquatic ecosystems and have harmful consequences for human activities. Moreover… Harmful Algae vol. 117, , p. 102285
  • Sala David, Grossi Vincent, Agogué Hélène, Leboulanger Christophe, Jézéquel Didier, Sarazin Gérard, Antheaume Ingrid, Bernard Cécile, Ader Magali & Hugoni Mylène, 2022Influence of aphotic haloclines and euxinia on organic biomarkers and microbial communities in a thalassohaline and alkaline volcanic crater lake. Studies on microbial communities, and their associated organic biomarkers, that are found thriving in the aphotic euxinic… Geobiology vol. 20, n° 2, p. 292-309 _eprint:
  • Hamlaoui Sahima, Yépremian Claude, Duval Charlotte, Marie Benjamin, Djediat Chakib, Piquet Bérénice, Bernard Cécile & Duperron Sébastien, 2022The culture collection of cyanobacteria and microalgae at the French National Museum of Natural History: a century old but still alive and kicking ! Including in memoriam: Professor Alain Couté. Cyanobacteria and eukaryotic microalgae are key players in life on Earth. They have adapted to a broad diversity of ecosystems,… Cryptogamie, Algologie vol. 43, n° 3, p. 41-83