Microbes catalyze countless chemical reactions in nature which control the chemistry of the environment. Aquatic Geomicrobiology looks at these reactions and their effect on the aquatic environments from the perspective of the microbes involved. The volume begins with three introductory chapters outlining the basic principles of microbial systematics, microbial ecology, and chemical thermodynamics. These provide a framework for exploring the microbial control of elemental cycling in the remaining chapters. Readers will learn how microbes control the cycling of elements, the structure of the microbial ecosystems involved, and what environmental factors influence the activities of microbial populations.