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
... northern range was considered to cover approximately 100,000 ha, 83,000 of this inside the park boundary (Houston 1982). But starting with that date, on average a third of the northern herd has moved each winter to terrain north of the ...
... northern range was considered to cover approximately 100,000 ha, 83,000 of this inside the park boundary (Houston 1982). But starting with that date, on average a third of the northern herd has moved each winter to terrain north of the ...
Стр. 3
... herd in the context of Yellowstone history, with excellent accounts presented in Sellars (1997), Pritchard (1999), and Shafer (2000). The northern ... northern range of Yellowstone National 3 1. History of the Northern Range Dispute.
... herd in the context of Yellowstone history, with excellent accounts presented in Sellars (1997), Pritchard (1999), and Shafer (2000). The northern ... northern range of Yellowstone National 3 1. History of the Northern Range Dispute.
Стр. 4
... northern range of Yellowstone National Park, redrawn from Cole (1969). A divides the upper and lower ranges. BLA is ... herd began increasing once hunting was brought under control. Park officials began censuses and concluded that the ...
... northern range of Yellowstone National Park, redrawn from Cole (1969). A divides the upper and lower ranges. BLA is ... herd began increasing once hunting was brought under control. Park officials began censuses and concluded that the ...
Стр. 5
... northern herd. Park officials decided that the herd had to be controlled to avoid continued and excessive damage to vegetation and entered into management phase 3, herd control. In the 1920s elk were trapped and removed to reduce the herd ...
... northern herd. Park officials decided that the herd had to be controlled to avoid continued and excessive damage to vegetation and entered into management phase 3, herd control. In the 1920s elk were trapped and removed to reduce the herd ...
Стр. 7
... northern herd. In the same year, Houston (1971) set forth the natural-regulation ecological hypothesis for the northern herd. The hypothesis had two key tenets: (1) The elk herd would be limited by intraspecific competition for food and ...
... northern herd. In the same year, Houston (1971) set forth the natural-regulation ecological hypothesis for the northern herd. The hypothesis had two key tenets: (1) The elk herd would be limited by intraspecific competition for food and ...
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