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. 8
... factor of six from its low point in 1968 (Houston 1982) to the levels of the early 1990s (Coughenour and Singer 1996). But whether that constituted an eruption and falsified the hypothesis has been impossible to say without definition ...
... factor of six from its low point in 1968 (Houston 1982) to the levels of the early 1990s (Coughenour and Singer 1996). But whether that constituted an eruption and falsified the hypothesis has been impossible to say without definition ...
Стр. 9
... factors affecting herd and ecological dynamics are but one facet of a larger and deeper problem that occurs when science and policy interact. As discussed, there are two separate but commingling aspects to the northern range issue. One ...
... factors affecting herd and ecological dynamics are but one facet of a larger and deeper problem that occurs when science and policy interact. As discussed, there are two separate but commingling aspects to the northern range issue. One ...
Стр. 10
... factors, including the severity of winter, location of forage, and perhaps predation pressure. In the winters of 2000–2001 and 2001–2002 the numbers of animals wintering north of the park were 3,800 and 5,100, respectively 10 A ...
... factors, including the severity of winter, location of forage, and perhaps predation pressure. In the winters of 2000–2001 and 2001–2002 the numbers of animals wintering north of the park were 3,800 and 5,100, respectively 10 A ...
Стр. 16
... factors, or estimated population size by other means. As a result, the numbers on this population have probably been bracketed as narrowly as any ungulate population of this size and over an area of this extent. However, the effort has ...
... factors, or estimated population size by other means. As a result, the numbers on this population have probably been bracketed as narrowly as any ungulate population of this size and over an area of this extent. However, the effort has ...
Стр. 18
... factors mentioned, this time series is therefore a sequence of indices rather than actual estimates of population number (table 2.1). Houston (1982:20) and Lemke et al. (1998) calculated “minimum fall populations” by adding hunting ...
... factors mentioned, this time series is therefore a sequence of indices rather than actual estimates of population number (table 2.1). Houston (1982:20) and Lemke et al. (1998) calculated “minimum fall populations” by adding hunting ...
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 |
Другие издания - Просмотреть все
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