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. 5
... impacts on willow (Salix spp.) and aspen (Populus tremuloides). The first biologist, M. P. Skinner, was assigned to the park at about the same time and was publishing in the scientific journals by 1921. Science-based management ...
... impacts on willow (Salix spp.) and aspen (Populus tremuloides). The first biologist, M. P. Skinner, was assigned to the park at about the same time and was publishing in the scientific journals by 1921. Science-based management ...
Стр. 6
... it would occur without significant impact on the vegetation. He cited 11 sources, including 6 intra-agency reports, 3 conference presentations, 1 Ph.D. dissertation, and 1 peer-reviewed publication, but he neither 6 A YELLOWSTONE SYNTHESIS.
... it would occur without significant impact on the vegetation. He cited 11 sources, including 6 intra-agency reports, 3 conference presentations, 1 Ph.D. dissertation, and 1 peer-reviewed publication, but he neither 6 A YELLOWSTONE SYNTHESIS.
Стр. 23
... impacts from environmental factors—whether severe weather conditions, additional hunting removal, or predation—as it ... impact from environmental factors the population could sustain, on average, without being forced to decline. The r ...
... impacts from environmental factors—whether severe weather conditions, additional hunting removal, or predation—as it ... impact from environmental factors the population could sustain, on average, without being forced to decline. The r ...
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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