Running waters are enormously diverse, ranging from torrential mountain brooks, to large lowland rivers, to great river systems whose basins occupy subcontinents. While this diversity makes river ecosystems seem overwhelmingly complex, a central theme of this volume is that the processes acting in running waters are general, although the settings are often unique. The past two decades have seen major advances in our knowledge of the ecology of streams and rivers. New paradigms have emerged, such as the river continuum and nutrient spiraling. Community ecologists have made impressive advances in documenting tte occurrence of species interactions. The importance of physical processes in rivers has attracted increased attention, particularly the areas of hydrology and geomorphology, and the inter-relationships between physical and biological factors have become better understood. And as is true for every area of ecology during the closing years of the twentieth century it has become apparent that the study of streams and rivers cannot be carried out by excluding the role of human activities, nor can we ignore the urgency of the need for conservation. These developments are brought together in Stream Ecology: Structure and function of running waters, designed to serve as a text for advanced undergraduate and graduate students, and as a reference book for specialists in stream ecology and related fields.

Streams is a handbook that combines a discussion of the ecology of streams and rivers, in layperson language, with an illustrated field guide of the plants and animals found in running waters of North America. Various illustrations and maps accompany the text. The authors are extremely well known--Cushing is the lead content provider for an "America On-Line" service provided through "Trout Unlimited" entitled "Ask Dr. Cushing." He is frequently asked the sorts of questions that are answered in this field guide. J. David Allan is the author of a well known textbook in Aquatic Ecology.

The second edition of Stream Ecology: Structure and Function Of Running Waters is thoroughly updated and expanded, reflecting the enormous growth in our understanding of stream metabolism and nutrient processes, which are the core of ecosystem functioning. The broad diversity of running waters - from torrential mountain brooks, to large lowland rivers, to great river systems whose basins occupy subcontinents - makes river ecosystems appear overwhelmingly complex. A central theme of this book is that although the settings are often unique, the processes at work in running waters can be understood in general terms. The new edition is extensively rewritten, with hydrology and geomorphology now accorded chapter-length discussion. Coverage includes a considerably improved and updated treatment of abiotic factors, organized around the habitat template concept. Additional new material outlines important advances in microbial ecology.