Current activities

Major research topics

  • Diversity and oceanic distribution of marine phytoplankton, in particular green algae and Bolidophyceae.
  • Analysis of marine eukaryotic communities using metabarcoding (nuclear 18S rRNA, plastid 16S rRN), especially on populations sorted by flow cytometry.
  • Polar picoplankton communities and their adaptation to the long winter polar night.
  • Development of databases for the analysis of eukaryotic metabarcodes: PR2 and metaPR2 (in progress)

Current Collaborations

Recent Collaborations



Phytoplankton survival in the polar night.


Marine protists in a changing Arctic

Green Edge

The Arctic Spring Bloom.


International collaborative projects.


Roscoff Culture Collection


18S rRNA sequence database


18S rRNA metabarcode database

Micro B3 (2012-2015)

Marine Microbial Biodiversity, Bioinformatics, Biotechnology

MaCuMBA (2012-2016)

Marine Microorganisms: Cultivation Methods for Improving their Biotechnological Applications

Malina (2008-2011)

The Beaufort Sea ecosystem.

Selected Publications

We used metabarcoding to analyze the temporal dynamics of the three domains of life in Singapore waters.
Scientific Reports 9, 16390, 2019

We describe two new species of Mantoniella, M. beaufortii and M. baffinensis that are most similar to the cosmopolitan M. squamata. Screening of global marine metabarcoding datasets indicates M. beaufortii has only been recorded in seawater and sea ice samples from the Arctic while no environmental barcode matches M. baffinensis suggesting that they are cold or ice-adapted Mantoniella species.
Journal of Phycology, in press, 2019

The analysis of the Ocean Sampling Day dataset allowed us to discover novel diversity within the widespread green algal class of Mamiellophyceae and to map their distribution in coastal waters.
Scientific Reports 9: 5190, 2019

A seven-year study in the Bay of Banyuls (North Western Mediterranean Sea) shows that despite some fluctuating environmental conditions, many microbial taxa displayed significant yearly rhythms.
The ISME journal 13:388-40, 2019

We used DNA metabarcoding of the 18S rRNA gene and particle interceptor traps (PITs) to characterize the taxonomic composition of particles sinking out of the photic layer in the California Current Ecosystem (CCE), a productive system with high export potential. Our findings identify Radiolaria as major actors in export fluxes in the CCE.
The ISME Journal, 13: 964–976, 2018

Bolidophyceae contains species with cells surrounded by 5 or 8 silica plates (Parmales) as well as naked flagellated species (formerly Bolidomonadales). Bolidophyceae share a common ancestor with diatoms. This review summarizes the current information on taxonomy, phylogeny, ecology, and physiology.
Frontiers in Marine Science, 5:370, 2018

Recent Publications

More Publications

Pdf files are available on Research Gate

. Can molecular tools enhance long-term monitoring of marine protists?. Journal of Plankton Research, 40:519–536, 2018.

PDF Source Document

. A novel species of the marine cyanobacterium Acaryochloris with a unique pigment content and lifestyle. Scientific reports, 8: 9142, 2018.

PDF Project

. DINOREF : A curated dinoflagellate (Dinophyceae) reference database for the 18S rRNA gene. Molecular Ecology Resources, 18, 974-987,, 2018.

PDF Dataset Project

. Small eukaryotic phytoplankton communities in tropical waters off Brazil are dominated by symbioses between Haptophyta and nitrogen-fixing cyanobacteria. The ISME Journal, (12), 5, pp. 1360–1374,, 2018.

PDF Dataset Project Slides

. Revision of the Genus Micromonas Manton et Parke (Chlorophyta, Mamiellophyceae), of the Type Species M. pusilla (Butcher) Manton & Parke and of the Species M. commoda van Baren, Bachy and Worden and Description of Two New Species Based on the Genetic and Phenotypic Characterization of Cultured Isolates. Protist, (168), 5, pp. 612–635,, 2017.

PDF Project Project Source Document

. Chloropicophyceae, a new class of picophytoplanktonic prasinophytes. Scientific Reports, (7), 1, pp. 14019,, 2017.

PDF Dataset Project Project

. Diversity and oceanic distribution of prasinophytes clade VII, the dominant group of green algae in oceanic waters. The ISME Journal, (11), 2, pp. 512–528,, 2017.

PDF Project Project Project

. Improvement of phytoplankton culture isolation using single cell sorting by flow cytometry. Journal of Phycology, (53), 2, pp. 271–282,, 2017.

Project Project

Submitted Publications

More Publications

. Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom. Earth System Science Data Discussions, (2019), pp. 1–42,, 2019.

Preprint Dataset Project

. Culturable diversity of Arctic phytoplankton during pack ice melting. Elementa, Science of the Anthropocene (submitted), 2019.

Preprint Dataset Project Project Project Project

. Pelagophyte assemblages of the global ocean display low intraspecific diversity. Environmental Microbiology, (submitted), 2018.


Recent Talks

Slides available on Speaker Desk


Recent teaching activity

Courses organized

  • 2019 - Co-organizer of APC 12 (Advanced Phytoplankton Course) in Roscoff, France - 3 weeks - May-June 2019
  • 2017 - Co-organizer of ASIAME 2 (South Asia Workshop in Aquatic Microbial Ecology) in Andaman Islands, India - 15 days - November 2017
  • 2015-2017 - Metagenomics of marine microbes (6 h lecture, 4 h practical session) - Organizing Committee. Marine Ecological and Evolutionary Genomics, Roscoff, June 2015
  • 2014 - Organizer of International Phytoplankton course, Macaé, Brasil (2 weeks) - December 2014
  • 2013 - Co-organizer of ASIAME (First South East Asia Workshop in Aquatic Microbial Ecology) in Vietnam, Nha Trang- 10 days - October 2013
  • 2013 - Co-organizer of the UPMC Daniel-Jouvance School in Marine-Biology - Arraial do Cabo, Brasil - March 2013

Courses taught

  • 2019 R course - part of ES7023 & ES0002: Fundamentals of Data Science for Earth and Environmental Systems Science ASE, Nanyang Technological University, Singapore
  • 2018 Using phyloseq for metabarcode data analysis, Formation metabarcoding, Roscoff
  • 2017 R for microbial ecology, ASIAME 2, South Asia Workshop in Aquatic Microbial Ecology, India
  • 2012-2017 Metagenomics of marine microbes (6 h lecture, 4 h practical session), Marine Ecological and Evolutionary Genomics, Roscoff
  • 2018-2006 Eukaryotic picoplankton, Introduction to R and to metabarcode processing (10 days). ECODIM workshop (South America post graduate course), University of Concepcion, Chile (takes place every two years)
  • 2012 Introduction to flow cytometry (3 h lecture, 6 h practical session). Oceanography Institute, Universidade de Sao Paulo, May 2012

Tutorials available on line