Ingénieur(e) d'études

Sarah Romac

position description

  • Coordination of  marine plankton sampling
  • Isolation and characterization of marine protists
  • Development of molecular tools for meta-omics applied for diversity and interactions studies insight the marine plankton.
  • Member of the Scientific Animation Comitee



Projects :


MixITiN H2020 project (Fabrice Not, 2017-2021):  Training the next generation of marine scientists to work on the mixoplankton paradigm, where mixotrophic plankton rule the waves.


OCEANOMICS IA Project (Colomban de Vargas, 2013-2020) : Study of the biocomplexity and biotechnological potential of oceanic plankton, linked to the Tara Oceans Expedition (2009-2012). www.


IMPEKAB ANR Project (Fabrice Not, 2015-2019): Study of the impact of environmental changes on planktonic photosymbiosis.


Plankton Planet Project (Colomban de Vargas, 2015-2020) : citizen science project to develop innovative user-friendly tools to deepen knowledge on global plankton ecology, morphology and genetics that will be universally accessible for scientists, teachers and policy-makers.


Singek H2020 Project (Colomban de Vargas, 2016-2019) : Training Network devised to provide a unique and structured PhD training programme to a new generation of scientists with the highest expertise in Single Cell Genomics, from the initial stages of cell sorting to genome sequencing and gene annotation, to the full exploitation of the data obtained.


CALHIS ANR Project (Ian Probert & Colomban de Vargas, 2013-2016) : CALcification HIStory of the pelagic environment during the last 300 years


Poseidon ANR Project (Colomban de Vargas, 2009-2012) : study of marine protist biodiversity during the Tara Ocean expedition.


BioMarks ANR Project (Colomban de Vargas, 2009-2013) : to assess the biocomplexity along the European coast line of unicellular eukaryotes.


Campaigns :


Tara Breizh bloom (2019)– Study of kinetics of a coccolithophore bloom in the Celtic Sea.


Tara Pacific expedition (2016-2018) – 7 legs on board– Study of coral reef ecosystems across the Pacific Ocean.


Caracalhis Campaign (2017) – Study of biodiversity of microcalcifers diversity in the Carribean sea.


Tara Ocean expedition (2009 – 2013) : logistic management.


BioMarks Campaign (2009-2010) : 7 sampling points in European coasts.



Flores J. M., Bourdin G., Altaratz O. […] Vardi A and Koren L. Tara Pacific expedition’s atmospheric measurements. Marine aerosols across the Atlantic and Pacific Oceans Overview and Preliminary results. Bulletin of the American Meteorological Society (2019) doi: 10.1175/BAMS-D-18-0224.1

Daniel J. Richter D. J., Watteaux R., Vannier T., […]Jaillon O. Genomic evidence for global ocean plankton biogeography shaped 1 by large-scale current systems. bioRxiv (2019) doi:

Gorski G., Bourdin G., Lombard F., […], Karsenti E. Expanding Tara Oceans Protocols forUnderway, Ecosystemic Sampling of the Ocean-Atmosphere Interface During Tara Pacific Expedition (2016–2018). Frontiers in Marine Science (2019) doi: 10.3389/fmars.2019.00750

Planes S., Allemand D., […],theTaraPacificConsortium. The Tara Pacific expedition—A pan-ecosystemic approach of the “-omics” complexity of coral reef holobionts across the Pacific Ocean. PLOSBiology (2019 |

Sandin M.S,  Pillet P., Biard T.,Poirier C., Bigeard E., Romac S., Suzuki N., Not F. Time Calibrated Morpho-molecular Classification of Nassellaria (Radiolaria). Protists (2019).

Ramond P., Sourisseau M., Simon N., Romac S., Schmitt S., Rigaut-Jalabert F., Henry N., de Vargas C., Siano S.  Coupling between taxonomic and functional diversity in protistan coastal communities: Functional diversity of marine protists. Environmental Microbiology (2019). DOI: 10.1111/1462-2920.14537

Piredda R., Claverie J.M., Decelle J., […], Romac S., Zingone A. Diatom diversity through HTS-metabarcoding in coastal European seas. Scientific Reports (2018). DOI: 10.1038/s41598-018-36345-9

Decelle J, Carradec Q., Pochon X, Henry N., Romac S., Mahe F., Dunthorn M., Kourlaiev A. Voolstra C.R., Wincker P., de Vargas C.Worldwide Occurrence and Activity of the Reef-Building Coral SymbiontSymbiodiniumin the Open Ocean Current Biology (2018).

Hume B.C.C., Ziegler M., Poulain J., Pochon X., Romac S., Boissin E., de Vargas C., Planes S., Wincker P., and Voolstra C.R. . An improved primer set and amplificationprotocol with increased specificity andsensitivity targeting theSymbiodiniumITS2 region. PeerJ. (2018) DOI: 10.7717/peerj.4816

Morard R., Garet-Delmas M.-J., Mahé F., Romac S., Poulain J., Kucera M., de Vargas C. Surface ocean metabarcoding confirms limited diversity in planktonic foraminifera but reveals unknown hyper-abundant lineages. Scientific Reports (2018). DOI: 10.1038/s41598-018-20833-z

Carradec Q., Pelletier E., Da Silva C., Alberti A., Seeleuthner Y., […], Wincker P. A global ocean atlas of eukaryotic genes. Nature Communications (2018). DOI: 10.1038/s41467-017-02342-1

Ward G., Sigrid Neuhauser S., Groben R., Ciaghi S., Cedric Berney C. Romac S., Bass D. Environmental Sequencing Fills the Gap Between Parasitic Haplosporidians and Free‐living Giant Amoebae. Journal of Eukaryotic Microbiology (2018). DOI: 10.1111/jeu.12501

Vincent F.J., Colin S., Romac S., Scalco E., Bittner L., Garcia Y., Lopes R.M., Dolan J.R., Zingone A., de Vargas C., Bowler C. The epibiotic life of the cosmopolitan diatom Fragilariopsis doliolus on heterotrophic ciliates in the open ocean. The ISME J (2018). DOI: 10.1038/s41396-017-0029-1

Alberti A., Poulain J, Engelen S.*, Karine Labadie K., Romac S., Ferrera I, […], Wincker P. Viral to metazoan marine plankton nucleotide sequences from the Tara Oceans expedition. Nature Scientific Data (2017). DOI: 10.1038/sdata.2017.93

Mahe F, de Vargas C, […] and Dunthorn M. Soil Protists in Three neotropical rainforests are hyperdiverse and dominated by parasites. Nature Ecology and Evolution (2017). DOI: 10.1038/s41559-017-0091

Lopes dos Santos A. Gourvil P, Tragin M, Noël MH, Decelle J, Romac S, and Vaulot D. Diversity and oceanic distribution of prasinophytes clade VII, the dominant group of green algae in oceanic waters. The ISME J (2016). DOI: 10.1038/ismej.2016.120

Forster D, Dunthorn M., Mahe F, […] and Stoeck T. Benthic protists: the under-charted majority. FEMS Microbiology Ecology. (2016). doi: 10.1093/femsec/fiw120

Giner CR, Forn I, Romac S, […] and Massana R. Environmental Sequencing Provides Reasonable Estimates of the Relative Abundance of Specific Picoeukaryotes. Applied and Environmental Microbiology (2016). DOI: 10.1128/AEM.00560-16

Mordret S, Romac S, […] and Decelle J. The symbiotic life of Symbiodinium in the open within a new species of calcifying ciliate (Tiarina sp.) The ISME J (2015). DOI: 10.1038/ismej.2015.211

Richards TA, Leonard G, […] and Chambouvet A. Molecular diversity and distribution of marine fungi across 130 European environmental samples. Proceedings of the Royal Society B: Biological Sciences. (2015). DOI: 10.1098/rspb.2015.2243

Clerissi C , Desdevises Y, Romac S, […] Grimsley N. Deep sequencing of amplified Prasinovirus and host green algal genes from an Indian Ocean transect reveals interacting trophic dependencies and new genotypes. Env Microbiology Reports (2015). DOI: 10.1111/1758-2229.12345

Lescot M Hinguamp P, […] Ogata H. Reverse transcriptase genes are highly abundant and transcriptionally active in marine plankton assemblages. The ISME J (2015).DOI: 10.1038/ismej.2015.192

De Vargas C, Audic S, […], and Karsenti E. Eukaryotic plankton diversity in the sunlit ocean. Science (2015). DOI: 10.1126/science.1261605

Massana R, […], and de Vargas C. Marine protist diversity in European coastal waters and sediments as revealed by high-throughput sequencing. Env microbiology (2015). DOI: 10.1111/1462-2920.12955

Decelle J, Romac S, [...], de Vargas C, Christen R. PhytoREF: a reference database of the plastidial 16S rRNA gene of photosynthetic eukaryotes with curated taxonomy. Mol. Ecol. Resour (2015). DOI: 10.1111/1755-0998.12401

Forster D, Bittner L, Karkar S, Dunthorn M, Romac S, Audic S, Lopez P, Stoeck T, Bapteste E. Testing ecological theories with sequence similarity networks: marine ciliates exhibit similar geographic dispersal patterns as multicellular organisms. BMC Biol. (2015). DOI: 10.1186/s12915-015-0125-5