The proposed thesis aims to improve our understanding of the mechanisms linking the diversity of siliceous marine planktonic organisms, including diatoms that account for 40% of primary marine production, in the modulation of carbon and silica biogoechemical fluxes of two contrasted polar ecosystems. Several advanced tools including epifluorescence microscopy/image analysis, transmitted light and scanning electron microscopy will be available to the student. Automated taxonomic analyzes such as CYTOSENSE and FLOWCAM are also available. The successful candidate will thus be trained to use a complementary set of chemical, isotopic and microscopic techniques.
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