Symbiotic interactions are those relationships between organisms that permit some species to overcome their physiological limitations by exploiting the capacities of others. This volume presents a modern synthesis of scientific knowledge of symbiosis, from the molecular mechanisms underlying its function to the ecological and evolutionary impact of such associations. With an emphasis on basic principles, the book takes the novel approach that symbiosis is a vehicle by which many organisms have gained access to complex metabolic capabilities. Examples are offered to illustrate this concept,...