Diversification Dynamics and Unsupervised Learning of Microbial Units in the Earth Microbiome

 In this thesis we introduce two theoretical frameworks, one at the macroevolutionary scale with which we find universal quantitative similarities in the tempo and mode of microbial diversification, and the other at the mesoscopic scale where we discover a rich hierarchy of organization and niche signals in the pattern of microbial abundances in the global ocean and in the process identify three putatively novel microbiomes.