In most habitats, adaptations are the single most obvious aspects of an organism's phenotype. However, the most obvious feature of many subterranean animals are losses, not adaptations. Even Darwin saw subterranean animals as degenerates: examples of eyelessness and loss of structure in general. For him, the explanation was a straightforward Lamarc

A critical examination of current knowledge and ideas on cave biology, with emphasis on evolution, ecology, and conservation.

The unprecedented level of diversity recorded among the clones of self-fertilizing gynogenetic unisexuals and self-fertilizing simultaneous hermaphrodites challenges current ideas on the predominant role of recombination in promoting evolution of biological diversity. Though limited to a few species, the existence of self-fertilizing and cycli

A deep-dive into the evolutionary biology, biogeography, and conservation of the most elusive subterranean creatures in the world. Far from the austere, sparsely populated ecosystems often conjured in the imagination, caves host some of the most mysterious and biodiverse natural systems in the world. Subterranean environments, however, are the least explored terrestrial habitats, contributing to misconceptions about their inhabitants. Edited by cave scientist and conservation ecologist Dr. J. Judson Wynne, Cave Biodiversity explores both the evolution and the conservation of subterrestrial-dwelling fauna. Covering both vertebrates and invertebrates, including mollusks, fishes, amphibians, arthropods, and other troglobionts, this volume brings together ichthyologists, entomologists, ecologists, herpetologists, and conservationists to provide a nuanced picture of life beneath the earth's surface. Broad chapters covering biotic and abiotic factors that influence evolution and support biodiversity precede chapters dedicated to specific taxa, highlighting phylogenetics and morphology, and delving into zoogeography, habitat, ecology, and dispersal mechanisms for each. Considerations for conservation of these fascinating, often bizarre, and often highly sensitive subterranean creatures are emphasized throughout. Cave Biodiversity aims to synthesize the principles of subterranean evolutionary biology and diversity through in-depth case studies of some of the most captivating and imperiled taxonomic groups in the world. Employing a multidisciplinary approach involving systematics, genetics, ecology, biogeography, evolutionary biology, and conservation science, Cave Biodiversity will be of keen interest to evolutionary biologists, ecologists, conservation biologists, and cave scientists, as well as advanced undergraduate and graduate students. Contributors: Maria E. Bichuette, Evin T. Carter, Prosanta Chakrabarty, Kenneth James Chapin, Danté B. Fenolio, Andrew G. Gluesenkamp, Jozef Grego, Francis G. Howarth, Leonardo Latella, Matthew L. Niemiller, Karen A. Ober, T. Keith Philips, John G. Phillips, Stuart Pimm, Daphne Soares, J. Judson Wynne, and Yahui Zhao.

This book summarizes the key adaptations enabling extremophile fishes to survive under harsh environmental conditions. It reviews the most recent research on acidic, Antarctic, cave, desert, hypersaline, hypoxic, temporary, and fast-flowing habitats, as well as naturally and anthropogenically toxic waters, while pointing out generalities that are evident across different study systems. Knowledge of the different adaptations that allow fish to cope with stressful environmental conditions furthers our understanding of basic physiological, ecological, and evolutionary principles. In several cases, evidence is provided for how the adaptation to extreme environments promotes the emergence of new species. Furthermore, a link is made to conservation biology, and how human activities have exacerbated existing extreme environments and created new ones. The book concludes with a discussion of major open questions in our understanding of the ecology and evolution of life in extreme environments.

Encyclopedia of Caves, Third Edition, provides detailed background information to anyone with a serious interest in caves. This includes students, both undergraduate and graduate, in the earth, biological and environmental sciences, and consultants, environmental scientists, land managers and government agency staff whose work requires them to know something about caves and the biota that inhabit them. Caves touch on many scientific interests in geology, climate science, biology, hydrology, archaeology, and paleontology, as well as more popular interests in sport caving and cave exploration. Case studies and descriptions of specific caves selected for their special features and public interest are also included. This book will appeal to these audiences by providing in-depth essays written by expert authors chosen for their expertise in their assigned subject. - Features 14 new chapters and 13 completely rewritten chapters - Contains beautifully illustrated content, with more than 500 color images of cave life and features - Provides extensive bibliographies that allow readers to access their subject of interest in greater depth

The history of biology is populated by numerous model species or organisms. But few vertebrate groups have aided evolutionary and ecological research more than the live-bearing fishes of the family Poeciliidae. Found throughout tropical and subtropical waters, poeciliids exhibit a fascinating variety of reproductive specializations, including viviparity, matrotrophy, unisexual reproduction, and alternative mating strategies, making them ideal models for research on patterns and processes in ecology, behavior, and evolution. Ecology and Evolution of Poeciliid Fishes is a much-needed overview of the scientific potential and understanding of these live-bearing fishes. Chapters by leading researchers take up a wide range of topics, including the evolution of unisexual reproduction, life in extreme environments, life-history evolution, and genetics. Designed to provide a single and highly approachable reference, Ecology and Evolution of Poeciliid Fishes will appeal to students and specialists interested in all aspects of evolutionary ecology.