Dr Sophie Bonnet

Principal investigator of HOPE

Short biography

My research focuses on the interactions between marine micro-organisms and nitrogen and carbon biogeochemical cycles, both from the perspective of the fundamental oceanography but also to contribute to design solutions which are adapted to the challenges that humans and the planet are facing, especially in southern countries. 

My current research interests include the Magnitude, Control and Fate of N2 fixation in the ocean. My scientific approach is interdisciplinary, integrating different scales, from the single-cell (cell specific activities of marine microbes) to the ecosystem approach (biogeochemical budgets) during field expeditions. I also devote time to initiate and develop marine microbe strain collections to perform both microbial research and complement field studies, and look for high added-value products for the development in southern countries.


Senior scientist (Directrice de recherche, DR1 HDR)
IRD, Mediterranean Institute of Oceanography (MIO)
Marseille, France & Noumea, New Caledonia

Curriculum Vitae


Accepted publications

Limnology & Oceanography, 2023, Volume 68, Issue 3, 666-677, 2023
A Mechanistic understanding of diazotroph aggregation and sinking: ‘a rolling tank approach’.

Ababou, F.E., Camps, M., Le Moigne, F., & Bonnet, S

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Frontiers in Marine Science, Volume 10, 2023
Influence of shallow hydrothermal fluids release on the functioning of phytoplankton communities

Tilliette, C., Gazeau, F. Portlock, G., Bonnet, S., Guigue, C., Leblond, N., Lory, C., Marie, D., Montanes, M., Pulido-Villena, E., Sarthou, G., Tedetti, M., Vorrath, M.E., Whitby, H. and Guieu, C.

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Limnology & Oceanography Letters, 8, 5, 2023
Diazotrophy in the Indian Ocean: current understanding and future perspectives

Chowdhury, S., Raes, E., Hörstmann, C., Ahmed, A., Ridame, C., Metzl, N., Bhavya, P.S., Sato, T., Shiozaki, T., Bonnet, S., Löscher, C.R., Singh, A., Benavides, M.

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Science, Volume 380, Issue 6647, pp. 812-817, 2023
Natural iron fertilization by shallow hydrothermal sources fuels diazotroph blooms in the Ocean

Bonnet, S., Guieu, C., Taillandier, V., Boulart, C., Bouruet-Aubertot, P., Gazeau, F., Bressac, M., Knapp, A. N., Cuypers, Y., González-Santana, D., Forrer, H. J., Grisoni, J.-M., Grosso, O., Habasque, J., Jardin-Camps, M., Leblond, N., Moigne, F. Le, Dhaussy, A. L., Lory, C., … Tilliette, C.

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Earth System Science Data, 15, 8, 2023
Global oceanic diazotroph database version 2 and elevated estimate of global oceanic N₂ fixation

Shao, Z., Xu, Y., Wang, H., Luo, W., Wang, L., Huang, Y., Agawin, N.S., Ahmed, A., Benavides, M., Bentzon-Tilia, M., Berman-Frank, I., Berthelot, H., Biegala, I.C., Bif, M.B., Bode, A., Bonnet, S., … and Luo, Y.W.

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Other projects


Shallow hydroThermal sOurces of trace elemeNts: potential impacts on biological productivity and the bioloGicAl carbon pump

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Interactions between planktonic organisms and biogeochemical cycles across trophic and N2 fixation gradients in the western tropical South Pacific Ocean: a multidisciplinary approach

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Biogeochemical and biological response to a diazotroph bloom in a low-nutrient, low-chlorophyll ecosystem: results from the VAHINE mesocosms experiment

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Diazotroph culture collection

Isolating new strains of diazotrophs for both academic and applied research purposes.

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