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. xi
... early historical accounts on wildlife resources. The result was an ecological scenario, already advocated by many archaeologists, that pre-Columbian ungulate populations in the Intermountain West had been held at low densities by native ...
... early historical accounts on wildlife resources. The result was an ecological scenario, already advocated by many archaeologists, that pre-Columbian ungulate populations in the Intermountain West had been held at low densities by native ...
Стр. 4
... herd began increasing once hunting was brought under control. Park officials began censuses and concluded that the northern herd had increased to 20,000–35,000 animals by the early 1900s. At the. 4 A YELLOWSTONE SYNTHESIS.
... herd began increasing once hunting was brought under control. Park officials began censuses and concluded that the northern herd had increased to 20,000–35,000 animals by the early 1900s. At the. 4 A YELLOWSTONE SYNTHESIS.
Стр. 5
... early 1900s. At the same time, EuroAmerican settlement and hunting outside the park were forcing the herd to winter largely inside its boundaries on the northern range. By 1914, park observers were reporting marked changes in vegetation ...
... early 1900s. At the same time, EuroAmerican settlement and hunting outside the park were forcing the herd to winter largely inside its boundaries on the northern range. By 1914, park observers were reporting marked changes in vegetation ...
Стр. 6
... early years. Phase 4 was adopted without any new scientific evidence, was contrary to a half century of prior research, and contrary to prevailing ecological theory (Sellars 1997; Pritchard 1999). This was pointed out in 1968 by park ...
... early years. Phase 4 was adopted without any new scientific evidence, was contrary to a half century of prior research, and contrary to prevailing ecological theory (Sellars 1997; Pritchard 1999). This was pointed out in 1968 by park ...
Стр. 11
... early to know whether wolf predation will significantly reduce the size of the northern elk herd. But the wolves have established territories precisely in the Park portions of the northern range. The northern herd winter censuses have ...
... early to know whether wolf predation will significantly reduce the size of the northern elk herd. But the wolves have established territories precisely in the Park portions of the northern range. The northern herd winter censuses have ...
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 |
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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