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
... range. It is the winter range of the largest of several wintering herds of Rocky Mountain elk (Cervus elaphus) that summer together on the higher elevation summer range in the central and southern portions of the park and migrate to ...
... range. It is the winter range of the largest of several wintering herds of Rocky Mountain elk (Cervus elaphus) that summer together on the higher elevation summer range in the central and southern portions of the park and migrate to ...
Стр. 4
... range of Yellowstone National Park, redrawn from Cole (1969). A divides the upper and lower ranges. BLA is variously the boundary line, Gardiner, or low-elevation ranges. northern range, to winter in lower elevations. Elk were not ...
... range of Yellowstone National Park, redrawn from Cole (1969). A divides the upper and lower ranges. BLA is variously the boundary line, Gardiner, or low-elevation ranges. northern range, to winter in lower elevations. Elk were not ...
Стр. 5
... winter largely inside its boundaries on the 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 ...
... winter largely inside its boundaries on the 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 ...
Стр. 10
... range. The park-supported science is being used to sustain the natural-regulation policy and is being popularized to ... winter was extremely severe. More than 7,000 northern herd elk (Lemke et al. 1998) moved out of the park in search of ...
... range. The park-supported science is being used to sustain the natural-regulation policy and is being popularized to ... winter was extremely severe. More than 7,000 northern herd elk (Lemke et al. 1998) moved out of the park in search of ...
Стр. 11
... range after decades of heavy use by a large herd and need for the animals to ... winter censuses have declined since the mid-1990s (see chapter 2), and the ... winter, and whatever the extent to which the wolves may reduce the number of ...
... range after decades of heavy use by a large herd and need for the animals to ... winter censuses have declined since the mid-1990s (see chapter 2), and the ... winter, and whatever the extent to which the wolves may reduce the number of ...
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 |
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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