12 rue Buffon
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.
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).
- October 2023 — Phytoplanktonic 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 , ,,ISSN1365-294X
- August 2023 — Monospecific 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,ISSN1364-5072
- June 2023 — Intra-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,ISSN2730-6151
- 2023 — Diversity, 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, ,,ISSN2296-7745
- December 2022 — Metagenome-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,ISSN2076-2607
- December 2022 — Widespread 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 , ,,ISSN1462-2920
- September 2022 — Characterization 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,ISSN2072-6651
- August 2022 — The 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,ISSN1568-9883
- 2022 — Influence 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: https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12477,ISSN1472-4669
- 2022 — The 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,ISSN0181-1568