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One of the most recognizable animals of the Southwest, the desert tortoise (Gopherus agassizii) makes its home in both the Sonoran and Mohave Deserts, as well as in tropical areas to the south in Mexico. Called by Tohono O'odham people "komik'c-ed," or "shell with living thing inside," it is one of the few desert creatures kept as a domestic pet—as well as one of the most studied reptiles in the world. Most of our knowledge of desert tortoises comes from studies of Mohave Desert populations in California and Nevada. However, the ecology, physiology, and behavior of these northern populations are quite different from those of their southern, Sonoran Desert, and tropical cousins, which have been studied much less. Differences in climate and habitat have shaped the evolution of three races of desert tortoises as they have adapted to changes in heat, rainfall, and sources of food and shelter as the deserts developed in the last ten million years. This book presents the first comprehensive summary of the natural history, biology, and conservation of the Sonoran and Sinaloan desert tortoises, reviewing the current state of knowledge of these creatures with appropriate comparisons to Mohave tortoises. It condenses a vast amount of information on population ecology, activity, and behavior based on decades of studying tortoise populations in Arizona and Sonora, Mexico, and also includes important material on the care and protection of tortoises. Thirty-two contributors address such topics as tortoise fossil records, DNA analysis, and the mystery of secretive hatchlings and juveniles. Tortoise health is discussed in chapters on the care of captives, and original data are presented on the diets of wild and captive tortoises, the nutrient content of plant foods, and blood parameters of healthy tortoises. Coverage of conservation issues includes husbandry methods for captive tortoises, an overview of protective measures, and an evaluation of threats to tortoises from introduced grass and wildfires. A final chapter on cultural knowledge presents stories and songs from indigenous peoples and explores their understanding of tortoises. As the only comprehensive book on the desert tortoise, this volume gathers a vast amount of information for scientists, veterinarians, and resource managers while also remaining useful to general readers who keep desert tortoises as backyard pets. It will stand as an enduring reference on this endearing creature for years to come.
The book presents a wide range of techniques for extracting information from satellite remote sensing images in forest fire danger assessment. It covers the main concepts involved in fire danger rating, and analyses the inputs derived from remotely sensed data for mapping fire danger at both the local and global scale. The questions addressed concern the estimation of fuel moisture content, the description of fuel structural properties, the estimation of meteorological danger indices, the analysis of human factors associated with fire ignition, and the integration of different risk factors in a geographic information system for fire danger management.
The southwestern deserts stretch from southeastern California to west Texas and then south to central Mexico. The landscape of this region is known as basin and range topography featuring to “sky islands” of forest rising from the desert lowlands which creates a uniquely diverse ecology. The region is further complicated by an international border, where governments have caused difficulties for many animal populations. This book puts a spotlight on individual research projects which are specific examples of work being done in the area and when they are all brought together, to shed a general light of understanding the biological and cultural resources of this vast region so that those same resources can be managed as effectively and efficiently as possible. The intent is to show that collaborative efforts among federal, state agency, university, and private sector researchers working with land managers, provides better science and better management than when scientists and land managers work independently.
"The Southwest is part of the multivolume series describing the nation's fire scene region by region. The volumes in To the Last Smoke also cover California, the Northern Rockies, the Great Plains, Florida, and several other critical fire regions"--Provided by publisher.
In the southwestern corner of Organ Pipe Cactus National Monument, on the border between Arizona and Mexico, one finds Quitobaquito, the second-largest oasis in the Sonoran Desert. There, with some effort, one might also find remnants of once-thriving O’odham communities and their predecessors with roots reaching back at least 12,000 years—along with evidence of their expulsion, the erasure of their past, attempts to recover that history, and the role of the National Park Service (NPS) at every layer. The outlines of the lost landscapes of Quitobaquito—now further threatened by the looming border wall—reemerge in Peoples of a Sonoran Desert Oasis as Jared Orsi tells the story of the land, its inhabitants ancient and recent, and the efforts of the NPS to “reclaim” Quitobaquito’s pristine natural form and to reverse the damage done to the O’odham community and culture, first by colonial incursions and then by proponents of “preservation.” Quitobaquito is ecologically and culturally rich, and this book summons both the natural and human history of this unique place to describe how people have made use of the land for some five hundred generations, subject to the shifting forces of subsistence and commerce, tradition and progress, cultural and biological preservation. Throughout, Orsi details the processes by which the NPS obliterated those cultural landscapes and then subsequently, as America began to reckon with its colonial legacy, worked with O’odham peoples to restore their rightful heritage. Tracing the building and erasing of past landscapes to make some of them more visible in the present, Peoples of a Sonoran Desert Oasis reveals how colonial legacies became embedded in national parks—and points to the possibility that such legacies might be undone and those lost landscapes remade.