Strategies and Mechanisms of Diapause in Aquatic Invertebrates -- to Diapause -- Timing of Diapause in Monogonont Rotifers: Mechanisms and Strategies -- Diapause in Crustaceans: Peculiarities of Induction -- Reactivation of Diapausing Crustaceans -- Diapause in Aquatic Insects, with Emphasis on Mosquitoes -- A Brief Perspective on Molecular Mechanisms of Diapause in Aquatic Invertebrates -- The Role of Diapause in Science and Human Uses -- Egg Bank Formation by Aquatic Invertebrates: A Bridge Across Disciplinary Boundaries -- Use of Cladoceran Resting Eggs to Trace Climate-driven and Anthropogenic Changes in Aquatic Ecosystems -- Reconstructing Microevolutionary Dynamics from Layered Egg Banks -- Does Timing of Emergence within a Season Affect the Evolution of Post-diapause Traits? Post-diapause and Directly Developing Phenotypes of Daphnia -- Diapause and its Consequences in the Daphnia galeata - cucullata - hyalina Species Complex -- Role of Diapause in Dispersal of Aquatic Invertebrates -- The Role of within Trophic Level Chemical Interactions in Diapause Induction: Basic and Applied Aspects -- Studying the Phenomenon of Dormancy: Why it is Important for Space Exploration. Dormancy is a suspension of the vital functions in an organism to overcome harsh environmental conditions, and sometimes can last for centuries. It is a widespread adaptation in many phyla, ranging from bacteria to vertebrates, and may exert a great influence on aquatic communities. Contributors to this new book are leaders in the field of diapause studies, and many authors were participants at a recent workshop on diapause in aquatic invertebrates (Pallanza, Italy 2003). The book consists of two major parts, as indicated in its title: Phenomenology of diapause and significance of this adaptation in scientific and practical uses. Application to newly developing areas such as cultivation of live food, like rotifers or Artemia, in modern aquaculture is covered, as are aspects of diapause that promote the colonization of new environments by facilitating the passive transport of resting stages of invasive species. Creation of artificial ecosystems outside of the Earth's biosphere using dormant propagules becomes an actual possibility as humankind develops plans to colonize our nearest planets. Also, studies on the vertical distribution of resting stages in undisturbed sediment cores yield important ecological and evolutionary information useful in investigations of past environments. Throughout the book properties of diapause and individual peculiarities of this ancient and well-developed adaptive phenomenon are regarded in evolutionarily distant groups such as Rotifers, Crustaceans and Insects.