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. 3
... commented, the largest of these winters in a low-elevation area in and adjacent to the northern part of the park, the northern range (figure 1.1). An extensive body of literature discusses issues involving this herd in the context of ...
... commented, the largest of these winters in a low-elevation area in and adjacent to the northern part of the park, the northern range (figure 1.1). An extensive body of literature discusses issues involving this herd in the context of ...
Стр. 10
... commented in the preface, there is no intent here to advocate a policy for the northern range. But chapter 17 discusses the need for a policy and a number of considerations involved in arriving at such a policy. IS THE NORTHERN RANGE ...
... commented in the preface, there is no intent here to advocate a policy for the northern range. But chapter 17 discusses the need for a policy and a number of considerations involved in arriving at such a policy. IS THE NORTHERN RANGE ...
Стр. 18
... commented that these censuses “probably biased [earlier] mathematical estimates of K downwards.” The lack of three censuses in the early 1980s obscures interpretation of population trend in that decade, but those in the following three ...
... commented that these censuses “probably biased [earlier] mathematical estimates of K downwards.” The lack of three censuses in the early 1980s obscures interpretation of population trend in that decade, but those in the following three ...
Стр. 23
... commented, my own analysis of minimum fall numbers (figure 2.1) with slightly different time periods showed essentially no difference. The data are too few, and too variable, to choose between the two results. But if the Taper and Gogan ...
... commented, my own analysis of minimum fall numbers (figure 2.1) with slightly different time periods showed essentially no difference. The data are too few, and too variable, to choose between the two results. But if the Taper and Gogan ...
Стр. 24
... commented that all censuses from 1935–68 were made after the hunting seasons and park removals. The mean, estimated fall populations for the censused years of the 1920s, 1930s, and 1940s were 14,624, 13,918, and 14,239. The mean, annual ...
... commented that all censuses from 1935–68 were made after the hunting seasons and park removals. The mean, estimated fall populations for the censused years of the 1920s, 1930s, and 1940s were 14,624, 13,918, and 14,239. The mean, annual ...
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