Scientist of Ifremer

Visiting scientist at Roscoff

I am researcher at Ifremer in Brest (France) since 2010 and I am hosted by the DIPO team a day per week. I study the biodiversity and ecology of protist species with a morphogenetic (cultures, microscopy, metabarcoding) approach. Species identifications and molecular ecological patterns are associated to biological and hydrological variables of the marine coastal ecosystem to depict the phenology of phytoplankton communities, species, and populations from high frequency to paleoecological time scales. My researche mainly focuses on potentially harmful species and on dinoflagellates in particular.


- Molecular ecology

- Harmful Algal Bloom (HAB) dynamics

- Coastal ecology

- Specific and functional marine protist diversity

- Dinoflagellate taxonomy

- Citizen science



PALMITO: PALeoécologie des MIcroalgues TOxiques et leur adaptation aux changements de l’écosystème côtier

POHEM: Ecologie des PrOtistes HEtérotrophes du milieu marin côtier analysée par approche de Metabarcoding fonctionnel

PHENOMER: Un réseau d’observation des phénomènes d’eaux colorées pour mieux connaitre la biodiversité des microalgues



Molecular ecology and HAB dynamics:

Klouch K. Z., Schmidt S., Andrieux-Loyer F., Le Gac M., Hervio-Heath D., Qui-Minet Z. N., Quéré J., Bigeard E., Guillou L., Siano R. Historical records from dated sediment cores unveiled the multidecadal dynamics of the toxic dinoflagellate Alexandrium minutum in the Bay of Brest (France) Submitted à FEMS Microbiology Ecology

Chapelle A., Le Gac. M., Labry C., Siano R., Quéré J., Caradec J., Le Bec C., Nezan E., Doner A., Gouriou J. The Bay of Brest (France) a new risky site for toxic Alexandrium minutum blooms and PSP shellfish contamination. Harmful Algal News No 51 August 2015, pag 5-6.

Siano R., Alves de Souza C., Foulon E., Bendif ElM., Simon N., Guillou L., Not F. Distribution and host diversity of Amoebophryidae parasites across oligotrophic waters of the Mediterranean Sea (2011) Biogeosciences 8: 267-278.


Protist diversity:

Le Bescot N., Mahé F. , Audic S., Dimier C., Garet M-J, Poulain J., Wincker 3, de Vargas C., Siano R. Global patterns of pelagic dinoflagellate diversity across protist size classes unveiled by metabarcoding (2016). Environnmental Microbiology 18: 609-626

de Vargas C., Audic S., Henry N., Decelle J., Mahé F., Logares R., Lara E., Berney C., Le Bescot N., Probert I., Carmichael M., Poulain J., Romac R, Colin S.,  Aury J.M., Bittner L., Chaffron S., Dunthorn M., Engelen S., Flegontova O., Guidi L., Horak A., Jaillon O., Lukes J., Malviya S., Morard R., Mulot M., Scalco E., Siano R., Vincent F., Zingone A., Dimier C., Picheral M., Searson S., Kandels-Lewis S., Acinas S.G., Bork P., Bowler C., Gorsky G., Grimsley N., Hingamp P., Iudicone D., Not F., Ogata H., Pesant S., Raes J., Sieracki M., Speich S., Stemman L., Sunagawa S., Weissenbach J., Wincker P., Karsenti E. and Tara Oceans Expedition, Tara Oceans Coordinators (2015). Eukaryotic plankton diversity in the sunlit global ocean. Science 348 (6237): 1-12

Massana R., Gobet A., Audic S., Bass D., Bittner L., Boutte C., Chambouvet A., Christen R, Claverie J.-M., Decelle J., Dolan J., Dunthorn M., Edvardsen B., Forn I., Forster D., Guillou L., Jaillon O., Kooistra W.H.C.F., Logares R., Mahé M., Not F., Ogata H., Pawlowski J. Massimo M.C., Probert I., Romac R., Richards T., Santini S., Tabrizi K-S, Siano R., Simon N., Stoeck T., Vaulot D., Zingone A., deVargas C. (2015) Marine protist diversity in European coastal waters and sediments as revealed by high-throughput sequencing. Environmental Microbiology. 17: 4035-4049.


Phytoplankton taxonomy:

Percopo I., Ruggiero M.V., Balzano S., Gourvil P., Lundhölm N., Siano R., Tammilehto A., Vaulot D, Sarno D. P. arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex. Journal of Phycology (2016). DOI: 10.1111/jpy.12395

Nézan E., Siano R., Boulben S., Six C., Bilien C., Chèze K., Duval A., Le Panse S., Quéré J. Chomérat N. Genetic diversity of the toxigenic family Kareniaceae (Gymnodiniales, Dinophyceae) in France, with the description of Karlodinium gentienii sp. nov.: a new harmful dinoflagellate (2014). Harmful Algae 40: 75-91 (Impact Factor: 3.95)

Probert I., Siano R., Poirier C., Decelle J., Biard T., Tuji A., Suzuki N., Not F. Brandtodinium gen. nov. and B. nutriculum comb. nov. (Dinophyceae), a dinoflagellate commonly found in symbiosis with polycystine radiolarians. Journal of Phycology 50 : 388–399 (2014) (Impact Factor: 2.239)

Siano R., Montresor M., Probert I., Not F., de Vargas C (2010). Pelagodinium gen. nov. and P. beii comb. nov., a dinoflagellate symbiont of planktonic foraminifera. Protist 161: 385-399.