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. 6
... elk, their habitat, and associated wildlife were different from what existed in primeval times; that ecological ... population itself interact to naturally control elk numbers within limits set by winter food” (Anonymous 1967b). In 1971 ...
... elk, their habitat, and associated wildlife were different from what existed in primeval times; that ecological ... population itself interact to naturally control elk numbers within limits set by winter food” (Anonymous 1967b). In 1971 ...
Стр. 10
... elk out of the park to foraging areas north of the park and reduction of elk numbers by predation. As discussed previously, the size of the northern range has increased since the late 1980s. This apparent range extension is probably ...
... elk out of the park to foraging areas north of the park and reduction of elk numbers by predation. As discussed previously, the size of the northern range has increased since the late 1980s. This apparent range extension is probably ...
Стр. 15
Elk Effects, Science, and Policy Conflict Frederic H. Wagner. The. Census. Period: 1923–2003. 2. The numbers of North American deer are limited by food shortage, which causes a rise in the death rate, especially among the young and senile ...
Elk Effects, Science, and Policy Conflict Frederic H. Wagner. The. Census. Period: 1923–2003. 2. The numbers of North American deer are limited by food shortage, which causes a rise in the death rate, especially among the young and senile ...
Стр. 16
... numbers for reasons that I describe shortly and update the time series from those used in the excellent Lemke et al. (1998) and Taper and Gogan (2002) studies, which extended through the ... ELK POPULATION CHANGES AND THE SYNTHESIS DESIGN.
... numbers for reasons that I describe shortly and update the time series from those used in the excellent Lemke et al. (1998) and Taper and Gogan (2002) studies, which extended through the ... ELK POPULATION CHANGES AND THE SYNTHESIS DESIGN.
Стр. 18
... numbers in table 2.1 point to a continuous increase in the minimum fall population from 1968–69 to 1974–75. There is a suggestion of slowing growth or ... Population Estimates, and Hunting 18 ELK POPULATION CHANGES AND THE SYNTHESIS DESIGN.
... numbers in table 2.1 point to a continuous increase in the minimum fall population from 1968–69 to 1974–75. There is a suggestion of slowing growth or ... Population Estimates, and Hunting 18 ELK POPULATION CHANGES AND THE SYNTHESIS DESIGN.
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