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Biard Tristan

par Valérie PLOUVIN - publié le

Maître de Conférences ULCO

Adresse Contact
Maison de la recherche en environnement naturel Tél : 03 21 99 64 30
32 avenue Foch Fax : 03 21 99 64 01
62930 Wimereux, France Email : Tristan Biard

Equipe 1 - Diversité, processus et interactions dans les écosystèmes marins

Research focus

Ecology and diversity of marine protists using in situ imaging technologies and high-throughput sequencing

I focus my research activities on Rhizaria, a supergroup of eukaryotes, some bearing mineralized skeletons (e.g., Radiolaria, Phaeodaria). I aim to better understand their ecology and role in marine food-webs and biogeochemical cycles. To this end I use single-cell approaches on specimens collected during regional or international field-trips, to barcode DNA and assess elemental composition of rhizarians. On the other hand, I regularly attend oceanographic expeditions where I used in situ imaging cameras (mainly the Underwater Vision Profilers) to study large rhizarians directly in their natural habitat. I also regularly use sediment traps (mainly free-drifting ones) to measure vertical fluxes of mineralized rhizarians and their contribution to the carbon or silica marine cycles.


Jan 2020 - to date Principal Investigator (ANR JCJC - AAPG2019)
Team Ecology of pelagic plankton (Laboratoire d’Océanologie et Géosciences, Wimereux, France)
RhiCycle : Role of Rhizaria in biogeochemical cycle in the epi- and mesopelagic ocean

Dec 2016 - Aug 2018 Scripps Postdoctoral Fellowship
California Current Ecosystem Long Term Ecological Research (Scripps Institution of Oceanography). Supervisor : M. Ohman
Rhizaria : flux, diversity and ecological significance in the California Current

Oct 2012 - Dec 2015 PhD in Biological Oceanography (Université Pierre et Marie Curie)
Team Diversity and Interaction in Marine Plankton (Laboratoire Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, France). Supervisors : F. Not, L. Stemmann
Diversity, biogeography and ecology of Collodaria (Radiolaria) in the world ocean

Jan - Jun 2012 MSc in Biological Oceanography (Université Pierre et Marie Curie)


Biostatistics (Undergraduates and Master students). Univariates and multivariates statistics applied to ecology.

Oceanography (Undergraduates and Master students). Sampling technics, taxonomy of phyto- and zooplankton. Plankton ecology and functionning of marine ecosystems.

Applied statistics and ecology with R (Master students)


[1] Stukel MR, Ohman MD, Kelly TB & Biard T (2019). The roles of suspension-feeding and flux-feeding zooplankton as gatekeepers of particle flux into the mesopelagic ocean. Frontiers in Marine Sciences – Marine Biochemistry. In press.
[2] Mendez Sandin M, Pillet L, Biard T, Poirier C, Bigeard E, Romac S, Suzuki N & Not F (2019). Time calibrated morpho-molecular classification of Nassellaria (Radiolaria). Protist, 170, 187-208.
[3] Caputi L, Carradec Q, Eveillard D, Kirilovsky A, Pelletier E, Pierella Karlusich JJ, Jimenez Vieira FR, Villar E, Chaffron S, Malviya S, Scalco E, Acinas SG, Alberti A, Aury JM, Benoiston AS, Bertrand A, Biard T, et al (2019). Community-level responses to iron availability in open ocean planktonic ecosystems. Global Biogeochemical Cycles, 33, 391-419.
[4] Gutierrez-Rodriguez A, Stukel MR, Lopes dos Santos A, Biard T, Scharek R, Vaulot D, Landry MR & Not F (2019). High contribution of Rhizaria (Radiolaria) to vertical export in the California Current Ecosystem revealed by DNA metabarcoding. ISME Journal, 13, 964-976.
[5] Stukel MR, Biard T, Krause JW & Ohman MD (2018). Large Phaeodaria in the twilight zone : Their role in the carbon cycle. Limnology and Oceanography, 63(6), 2579-2594.
[6] Biard T, Krause JW, Stukel MR & Ohman MD (2018). The significance of giant Phaeodarians (Rhizaria) to biogenic silica export in the California Current Ecosystem. Global Biogeochemical Cycles, 32(6), 987-1004.
[7] Biard T, Bigeard E, Audic S, Poulain J, Gutierrez-Rodriguez A, Pesant S, Stemmann L & Not F (2017). Biogeography and diversity of Collodaria (Radiolaria) in the global ocean. ISME Journal, 11(6), 1331-1344.
[8] Gutierrez-Rodriguez A, Pillet L, Biard T, Said-Ahmad W, Amrani A, Simo R & Not F (2017). Dimethylated sulfur compounds in symbiotic protists : A potentially significant source for marine DMS(P). Limnology and Oceanography, 62(3), 1139-1154.
[9] Chust G, Vogt M, Benedetti F, Nakov T, Villéger S, Aubert A, Vallina SM, Righetti D, Not F, Biard T, et al. (2017). Mare incognitum : A glimpse into future plankton diversity and ecology research. Frontiers in Marine Science.
[10] Biard T, Stemmann L, Picheral M, Mayot N, Vandromme P, Hause H, Gorsky G, Guidi L, Kiko R & Not F (2016). In situ imaging reveals the biomass of giant protists in the global oceans. Nature, 532, 504-507.
[11] Biard T, Pillet L, Decelle J, Poirier C, Suzuki N & Not F (2015). Towards an integrative morpho-molecular classification of the Collodaria (Polycystinea, Radiolaria). Protist, 163, 374-388.
[12] Probert I, Siano R, Poirier C, Decelle J, Biard T, Tuji A, Suzuki N & Not F (2014). Brandtodinium gen. nov. and B. nutricula comb. nov. (Dinophyceae), a dinoflagellate commonly found in symbiosis with polycystine radiolarians. Journal of phycology, 50, 388-399.