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
... densities by native carnivores and especially by aboriginal 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 ...
... densities by native carnivores and especially by aboriginal 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 ...
Стр. 3
... densities prior to European contact by carnivorous predators and aboriginal 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 ...
... densities prior to European contact by carnivorous predators and aboriginal 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 ...
Стр. 15
... density-dependent, though precipitated by heavy snowfalls. —David Lack ELK POPULATION MEASUREMENTS Inferences from Census Data The first superintendents assigned to the park after its 1872 establishment were civilian; from 1886 to 1916 ...
... density-dependent, though precipitated by heavy snowfalls. —David Lack ELK POPULATION MEASUREMENTS Inferences from Census Data The first superintendents assigned to the park after its 1872 establishment were civilian; from 1886 to 1916 ...
Стр. 20
... density, an extremely interesting result, as I will discuss, if the pattern continues into the future beyond their five data points. I similarly divided the time series into early and late periods using the data in table 2.1. But I ...
... density, an extremely interesting result, as I will discuss, if the pattern continues into the future beyond their five data points. I similarly divided the time series into early and late periods using the data in table 2.1. But I ...
Стр. 21
... density-dependent functions for fertility and adult survivorship. Hunting offtake was also roughly density-dependent during the 1968–95 period. The mean percentages of the fall population taken (table 2.1), again omitting the 4 aberrant ...
... density-dependent functions for fertility and adult survivorship. Hunting offtake was also roughly density-dependent during the 1968–95 period. The mean percentages of the fall population taken (table 2.1), again omitting the 4 aberrant ...
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