Barosa da Silva, Bernardo (2025) Extremophilic microbial diversity in geothermal environments at the interface between the Biosphere and Geosphere. [Tesi di dottorato]

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Abstract

The premise behind the present doctoral thesis follows the principles of biogeochemistry as defined in Shock and Boyd (2015), in which the emergence and evolution of life is contextualized as a planetary process. This view, therefore, implies an intricate relationship between living systems and other planetary processes, such as volcanism, tectonics, hydrothermalism, and climate change. There has been an increasing body of literature demonstrating the complex feedbacks between life and our own planet (extensively reviewed over the different chapters in the present thesis). One of the most important events in this shared trajectory, and often cited as a key example, was the oxygenation of our planet derived from the evolution of oxygenic photosynthesis by Cyanobacteria. The consequent Earth’s great oxidation event, in turn, allowed the diversification and expansion of the metabolic avenues of living organisms, and ultimately, the evolution of complex life. Notwithstanding, the interactions between the geosphere and the biosphere further need to be constrained and deconvolved at further detail and increased depth. This will allow us to gain a deeper understanding on the fundamental properties of living systems, the evolution of life on our own planet, their coevolution over time, and on the possibilities of finding life elsewhere in the cosmos.The main scope of the present PhD thesis is to address those unknowns.

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