Version en français: À VENIR
My research project examines bacterial metabolism in freshwater ecosystems and its role in organic carbon processing and greenhouse gas emissions. Organic C may be incorporated into bacterial biomass, ultimately fuelling the aquatic food-web, or it may be mineralized by bacteria and released as CO2, a powerful greenhouse gas. Therefore, one aspect of my research involves the bioavailability of dissolved organic carbon to bacteria and the factors controlling this bioavailability. I have also conducted a study on the biogeneration (by bacteria) of refractory organic compounds as a potential pathway for long-term C storage in aquatic ecosystems, the results of which I have resubmitted for publication in Environmental Microbiology. I am currently finishing a manuscript for submission to the Proceedings of the National Academy of Sciences (PNAS), which assess the preferential consumption and the metabolic selectivity for growth or respiration of terrestrial vs. algal DOC. This work was carried out in collaboration with Prof. S. Leigh McCallister of Virginia Commonwealth University. At the same time, I am writing the general introduction to my Ph.D. thesis and adapting chapters that are already written. The manuscript for PNAS and the introduction are expected to be finalized by the end of December. Furthermore, I am collaborating with Martin Berggren, Jean-François Lapierre and Paul del Giorgio on a short paper intended for publication in Science, assessing the potential impact of freshwater brownification on aquatic greenhouse gas emissions.
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