the takuvik


Département de Biologie /
Pavillon Alexandre-Vachon
1045, av. de la Médecine, local 2078
Université Laval
Québec (Québec) G1V 0A6
Phone : +1 418 656 5193


Johann Lavaud

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Research scientist (CNRS) – Adjunct Professor (ULaval) Ecophysiology of microalgae

Phone : 418-656-2131 #8176
Fax : 418-656-2339


Habilitation (French HDR) in Marine Biology and Ecology (2015)
Université La Rochelle, France.

Ph.D. in Marine Biology (2002)
Université P. et M. Curie-Paris 6, France.

Master in Oceanography and Marine Biology (1998)
Université P. et M. Curie-Paris 6, France.

Research interests:

  • Ecophysiology of phytoplankton and microphytobenthos : functional diversity vs. habitat distribution, focus on diatoms.
  • Physiology of photosynthesis: photosynthesis regulation vs. environment, focus on light response.
  • Methodology of chlorophyll fluorescence : improvement of the in situ and lab photosynthetic activity measurement.


After completing my Ph.D. at the Ecole Normale Supérieure in Paris in 2002, I went on with a post-doc in the lab of Plant Ecophysiology at the University of Konstanz (Germany) where I got an Assistant Professor position in 2004. In 2008, I went back to France on a CNRS Chargé de Recherche position at the Institut du Littoral et de l’Environnement-Université de La Rochelle until I moved to the Takuvik lab-Université Laval end of 2015. Since my master studies I have been mainly working on diatoms, both planktonic and benthic forms, and more specifically on the response of their photosynthetic activity to the environment (light, temperature, salinity). I use a coupled lab-field approach at different scales: from the gene to the ecosystem via the cell and the community. Progressively, I got interested in understanding how photosynthetic regulatory processes influence the diversity of diatom growth forms/species among marine habitats. In parallel, I enjoy developing and improving technics for a better assessment of microalgal photosynthetic productivity. In Takuvik, I will explore the regulation of photosynthesis of planktonic and sea-ice diatoms in the framework of the on-going climate change in the Arctic.

Selected Publications:

Full list here :

Lavaud J., Six C. & Campbell D.C. 2016. Photosystem II repair in marine diatoms with contrasting photophysiologies. Photosynthesis Research, 127:189-199.

Laviale M., Barnett A., Ezequiel J., Lepetit B., Frankenbach S., Méléder V., Serodio J. & Lavaud J. 2015. Response of intertidal benthic microalgal biofilms to a coupled ligh-temperature stress: evidence for latitudinal adaptation along the Atlantic coast of Southern Europe. Environmental Microbiology, 17:3662-3677.

Barnett A., Méléder V., Blommaert L., Lepetit B., Gaudin P., Vyverman W., Sabbe K., Dupuy C. & Lavaud J. 2015. Growth form defines physiological photoprotective capacity in intertidal benthic diatoms. ISME Journal, 9:39-45.

Lavaud J. & Goss, R. 2014. The peculiar features of non-photochemical fluorescence quenching in diatoms and brown algae. In Demmig-Adams B., Adams II W.W., Garab G., Govindjee (eds) Non-Photochemical Fluorescence Quenching and Energy Dissipation In Plants, Algae and Cyanobacteria, Series: Advances in Photosynthesis and Respiration Vol. 40-Chapter 20, Springer, pp 421-443.

Lavaud J. & Lepetit B. 2013. An explanation for the inter-species variability of the photoprotective non-photochemical chlorophyll fluorescence quenching in diatoms. Biochimica Biophysica Acta-Bioenergetics, 1827:294-302.