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
... hunting. The point is not only pivotal in the debate over the natural regulation paradigm but more broadly relevant to North American ecology and the implications to national park, wilderness, and protected-area policies. Within the ...
... hunting. The point is not only pivotal in the debate over the natural regulation paradigm but more broadly relevant to North American ecology and the implications to national park, wilderness, and protected-area policies. Within the ...
Стр. 3
... hunting. They opined that animals that we now consider the northern herd summered in the higher elevations of what became the park; and migrated considerable distances northward down the Yellowstone River valley, out of what later ...
... hunting. They opined that animals that we now consider the northern herd summered in the higher elevations of what became the park; and migrated considerable distances northward down the Yellowstone River valley, out of what later ...
Стр. 4
... hunting banned, predators controlled, and ungulates fed artificially in winter. Hunting continued for a period following creation of the park until 1877, when then Superintendent Philetus Norris appealed to market hunters to stop the ...
... hunting banned, predators controlled, and ungulates fed artificially in winter. Hunting continued for a period following creation of the park until 1877, when then Superintendent Philetus Norris appealed to market hunters to stop the ...
Стр. 5
... 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 in the northern range (Smith et al. 1915). These were ...
... 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 in the northern range (Smith et al. 1915). These were ...
Стр. 6
... hunters in the surrounding states who objected to the rangers' shooting and who demanded that the park be opened to public hunting. Then Park Service Director G. B. Hartzog Jr. (1988:252–53) stated: I did agree with [Wyoming] Senator ...
... hunters in the surrounding states who objected to the rangers' shooting and who demanded that the park be opened to public hunting. Then Park Service Director G. B. Hartzog Jr. (1988:252–53) stated: I did agree with [Wyoming] Senator ...
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