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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... century position and to prevailing ecological and wildlife-management theory. By the 1970s, a number of professional ecologists with whom I had lengthy conversations emerged as critics of natural regulation. Most incisive were the late ...
... century position and to prevailing ecological and wildlife-management theory. By the 1970s, a number of professional ecologists with whom I had lengthy conversations emerged as critics of natural regulation. Most incisive were the late ...
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... centuries or probably millennia prior to the establishment of Yellowstone National Park in 1872. Early park officials considered that elk populations in the region had been held at low densities prior to European contact by carnivorous ...
... centuries or probably millennia prior to the establishment of Yellowstone National Park in 1872. Early park officials considered that elk populations in the region had been held at low densities prior to European contact by carnivorous ...
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... century until challenged in the 1960s and 1970s. The second management phase began with park establishment and continued for approximately a half century. Its protocol was protection, with Native Americans evicted, hunting banned ...
... century until challenged in the 1960s and 1970s. The second management phase began with park establishment and continued for approximately a half century. Its protocol was protection, with Native Americans evicted, hunting banned ...
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... century of prior research, and contrary to prevailing ecological theory (Sellars 1997; Pritchard 1999). This was pointed out in 1968 by park biologist William Barmore in a memorandum to his superior (1968): we are abruptly “scrapping ...
... century of prior research, and contrary to prevailing ecological theory (Sellars 1997; Pritchard 1999). This was pointed out in 1968 by park biologist William Barmore in a memorandum to his superior (1968): we are abruptly “scrapping ...
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... century of herd control were apparent; 3,172 animals were censused in 1968. Thus Houston's hypothesis predicted: 1. The northern herd would equilibrate at approximately 6,000–9,000 animals. (However, three years later, following a ...
... century of herd control were apparent; 3,172 animals were censused in 1968. Thus Houston's hypothesis predicted: 1. The northern herd would equilibrate at approximately 6,000–9,000 animals. (However, three years later, following a ...
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 |
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