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Lawrence E. Stevens

Museum Of Northern Arizona United States of America

Dr. Larry Stevens is the Curator of Ecology and Conservation at the Museum of Northern Arizona in Flagstaff. He is an evolutionary ecologist and a leading authority on the biology of the Grand Canyon region. He formerly served as the Park Ecologist for Grand Canyon National Park, and in addition to his curatorial post he presently also serves as Senior Ecologist for Grand Canyon Wildlands Council, Inc., a non-governmental conservation organization. Stevens has worked on a wide array of scientific topics over his career, including biogeography, regulated river ecology, endangered species biology, and most recently the ecology and stewardship of springs. He has authored or coauthored several books and numerous scientific and popular articles on topics, recently ranging from robberfly taxonomy, waterbug biogeography, peregrine falcon foraging behavior, river and dam management, springs ecosystem ecology, and whitewater river running. His primary scientific interests focus on assemblage responses to landscape development and environmental change over time.

1books edited

2chapters authored

Latest work with IntechOpen by Lawrence E. Stevens

Global Advances in Biogeography brings together the work of more than 30 scientific authorities on biogeography from around the world. The book focuses on spatial and temporal variation of biological assemblages in relation to landscape complexity and environmental change. Global Advances embraces four themes: biogeographic theory and tests of concepts, the regional biogeography of individual taxa, the biogeography of complex landscapes, and the deep-time evolutionary biogeography of macrotaxa. In addition, the book provides a trove of new information about unusual landscapes, the natural history of a wide array of poorly known plant and animal species, and global conservation issues. This book is well illustrated with numerous maps, graphics, and photographs, and contains much new basic biogeographical information that is not available elsewhere. It will serve as an invaluable reference for professionals and members of the public interested in global biogeography, evolution, taxonomy, and conservation.

Global Advances in Biogeography

Global Advances in Biogeography

Edited by Lawrence E. Stevens

Chapters authored

The Biogeographic Significance of a Large, Deep Canyon: Grand Canyon of the Colorado River, Southwestern USA

By Lawrence E. Stevens

Part of the book: Global Advances in Biogeography

Characteristics and Process Interactions in Natural Fluvial–Riparian Ecosystems: A Synopsis of the Watershed-Continuum Model

By Lawrence E. Stevens, Raymond R. Johnson and Christopher Estes

The watershed-continuum model (WCM) describes fluvial-riparian ecosystems (FREs) as dynamic reach-based ecohydrogeological riverine landscapes linking aquatic, riparian, and upland domains within watersheds. FRE domains include aquatic (channels, hyporheic zones, springs, other groundwater zones and in-channel lakes), riparian, and adjacent upland zones, all of which can interact spatio-temporally. Occupying only a minute proportion of the terrestrial surface, FREs contain and process only a tiny fraction of the Earth’s freshwater, but often are highly productive, flood-disturbed, and ecologically interactive, supporting diverse, densely-packed biotic assemblages and socio-cultural resource uses and functions. FRE biodiversity is influenced by hydrogeomorphology, ecotonal transitions, and shifting habitat mosaics across stage elevation. Thus, the WCM integrates physical, biological, and socio-cultural characteristics, elements, and processes of FREs. Here, we summarize and illustrate the WCM, integrating diverse physical and ecological conceptual models to describe natural (unmanipulated) FRE dynamics. We integrate key processes affecting FRE forms and functions, and illustrate reach-based organization across temporal and spatial scales. Such a holistic approach into natural FRE structure and functions provides a baseline against which to measure and calibrate ecosystem alteration, management, and rehabilitation potential. Integration of groundwater, fluvial, and lacustrine ecological interactions within entire basins supports long-term, seasonally-based sustainable river management, which has never been more urgently needed.

Part of the book: River Basin Management

Related collaborators

Hugo H. Mejia-Madrid

National Autonomous University of Mexico , Mexico

Magdy El-Bana

Khalid Awadh Al-Mutairi

Universiti Sains Malaysia , Malaysia

Mashhor Mansor

Universiti Sains Malaysia , Malaysia

Saud Al-Rowaily

King Saud University , Saudi Arabia

Asyraf Mansor

Universiti Sains Malaysia , Malaysia

Toshiharu Mita

Tokyo University of Agriculture , Japan

Yukiko Matsumoto

National Institute of Agrobiological Sciences , Japan

Sachiyo Sanada-Morimura

Tokyo University of Agriculture , Japan

Masaya Matsumura

Tokyo University of Agriculture , Japan