Yellowstone's Destabilized Ecosystem: Elk Effects, Science, and Policy ConflictOxford University Press, 25 мая 2006 г. - Всего страниц: 392 Wagner, one of our most distinguished wildlife biologists, is a strong critic of ecological practices in the national parks. This book provides an assessment of the ecological history of Yellowstone's northern range, since before the park existed, showing the impact of US Park Service policies on the health of the areas they oversee. He demonstrates that elk had been historically rare throughout the region and that overgrazing by elk has seriously degraded the landscape and altered the structure of the area. This is a major contribution to reconstructing the ecology of this region over the course of the past 500 years. It is also a critique of US Park Service management policies and their stewardship of the nation's most cherished natural areas. Wagner's book will generate substantial attention and debate both in the scientific and policy/management communities. |
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Стр. viii
... northern range issue on behalf of numerous agency and academic scientists, both U.S. and Canadian, who have looked with near incredulity on the northern range issue but had no research under way with which to pose factual critiques; and ...
... northern range issue on behalf of numerous agency and academic scientists, both U.S. and Canadian, who have looked with near incredulity on the northern range issue but had no research under way with which to pose factual critiques; and ...
Стр. x
... northern elk herd in the northern range ecosystem. ACKNOWLEDGMENTS The stimulus for writing this book has grown over time in response to a sequence of events and interactions with key individuals. In the early 1960s, I accompanied ...
... northern elk herd in the northern range ecosystem. ACKNOWLEDGMENTS The stimulus for writing this book has grown over time in response to a sequence of events and interactions with key individuals. In the early 1960s, I accompanied ...
Стр. xi
... northern range situation. Alston Chase, former chairman of the Philosophy Department at Macalester College, resigned ... environmental consultant, writer, and photographer who had a master's degree from the University of Montana and had been ...
... northern range situation. Alston Chase, former chairman of the Philosophy Department at Macalester College, resigned ... environmental consultant, writer, and photographer who had a master's degree from the University of Montana and had been ...
Стр. 5
... northern range. By 1914, park observers were reporting marked changes in vegetation in the northern range (Smith et al. 1915). These were attributed to heavy grazing and browsing by the enlarged northern herd. Park officials decided ...
... northern range. By 1914, park observers were reporting marked changes in vegetation in the northern range (Smith et al. 1915). These were attributed to heavy grazing and browsing by the enlarged northern herd. Park officials decided ...
Стр. 7
... ecological hypothesis for the northern herd. The hypothesis had two key tenets: (1) The elk herd would be limited by intraspecific ... ecosystem. This hypothesis and predictions were linked to the size of the ... Northern Range Dispute 7.
... ecological hypothesis for the northern herd. The hypothesis had two key tenets: (1) The elk herd would be limited by intraspecific ... ecosystem. This hypothesis and predictions were linked to the size of the ... Northern Range Dispute 7.
Содержание
1 | |
13 | |
Part III Elk Effects on Ecosystem Structure and Function | 57 |
Part IV The Role of Science in Policy Process | 305 |
References | 335 |
Index | 359 |
Другие издания - Просмотреть все
Yellowstone's Destabilized Ecosystem: Elk Effects, Science, and Policy Conflict Frederic H. Wagner Ограниченный просмотр - 2006 |
Yellowstone's Destabilized Ecosystem: Elk Effects, Science, and Policy Conflict Frederic H. Wagner Ограниченный просмотр - 2006 |
Yellowstone's Destabilized Ecosystem: Elk Effects, Science, and Policy Conflict Frederic H. Wagner Ограниченный просмотр - 2006 |
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abundance animals aspen authors Barmore beaver bighorn bighorn sheep biomass Bishop bison Butte Creek censuses century clones commented competition components conifers Coughenour Coughenour and Singer decades density Despain early ecological effects elk herd elk numbers elk population Engstrom ern range erosion estimates evidence exclosures factors figure forage grasses grazing habitat herbaceous herbaceous vegetation herbivory higher elevations highlining Houston hunting impacts increase indicates inferences inside the exclosures interspecific competition Kay’s Keigley Kittams lakes Lamar River levels lower measurements ment mule deer National Park northern herd northern range ecosystem observed occurred park establishment park history park’s period photographs plants processes production pronghorn r-values reduced reported result riparian riparian zones sagebrush Schullery sediment shrub significant soil species studies suggest tannin tion trees trends ungrazed ungulate Wagner Wambolt willow decline winter range Yellowstone Yellowstone National Park