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. vii
... photographic and historical records, annual reports of park superintendents since establishment in 1872, and a plethora of research on the effects of elk on the northern range begun in the 1920s provide a massive accumulation of ...
... photographic and historical records, annual reports of park superintendents since establishment in 1872, and a plethora of research on the effects of elk on the northern range begun in the 1920s provide a massive accumulation of ...
Стр. xi
... photographer who had a master's degree from the University of Montana and had been employed by the Alaska Department of Fish and Game to police the environmental restrictions on Alaska pipeline construction. Skeptical about natural ...
... photographer who had a master's degree from the University of Montana and had been employed by the Alaska Department of Fish and Game to police the environmental restrictions on Alaska pipeline construction. Skeptical about natural ...
Стр. 5
... agency biologists during this phase measured vegetation trends and built exclosures to determine vegetation dynamics free from ungulate grazing. Systematic photographs documented conditions History of the Northern Range Dispute 5.
... agency biologists during this phase measured vegetation trends and built exclosures to determine vegetation dynamics free from ungulate grazing. Systematic photographs documented conditions History of the Northern Range Dispute 5.
Стр. 6
... photographs documented conditions and trends in the vegetation, especially the woody component, and complemented photographs taken more randomly in the early years. Phase 4 was adopted without any new scientific evidence, was contrary ...
... photographs documented conditions and trends in the vegetation, especially the woody component, and complemented photographs taken more randomly in the early years. Phase 4 was adopted without any new scientific evidence, was contrary ...
Стр. 7
... photographs would not show the contemporary vegetation to “depart from pristine conditions because of grazing by the ... photographic record, and studied elk demography and feeding ecology. In general it reversed most of the inferences ...
... photographs would not show the contemporary vegetation to “depart from pristine conditions because of grazing by the ... photographic record, and studied elk demography and feeding ecology. In general it reversed most of the inferences ...
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 |
Часто встречающиеся слова и выражения
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