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. |
Результаты поиска по книге
Результаты 1 – 5 из 84
Стр. viii
... levels ranging from landscapes and ecosystems to individual organisms, depending on the questions of interest (compare O'Neill et al. 1986; Allen and Hoekstra 1992). Science commonly begins description of a phenomenon of interest at a ...
... levels ranging from landscapes and ecosystems to individual organisms, depending on the questions of interest (compare O'Neill et al. 1986; Allen and Hoekstra 1992). Science commonly begins description of a phenomenon of interest at a ...
Стр. ix
... levels of probability. Analytic science lends itself to quantifying those levels. Well-replicated experiments and repeated measurements of quantifiable variables facilitate explicit probability statements. Because of the varied sources ...
... levels of probability. Analytic science lends itself to quantifying those levels. Well-replicated experiments and repeated measurements of quantifiable variables facilitate explicit probability statements. Because of the varied sources ...
Стр. 7
... levels that would not have undue effects on the ecosystem. This hypothesis and predictions were linked to the size ... level was revised to 12,000– 15,000; Houston 1974.) 2. There would be no competitive exclusion of sympatric herbivores ...
... levels that would not have undue effects on the ecosystem. This hypothesis and predictions were linked to the size ... level was revised to 12,000– 15,000; Houston 1974.) 2. There would be no competitive exclusion of sympatric herbivores ...
Стр. 8
... levels on the issue. In 1986, Congress appropriated funds for the park to research the question “Is the northern range overgrazed?” The funds were used to support “40 separate research projects” (Singer 1989) both by National Park ...
... levels on the issue. In 1986, Congress appropriated funds for the park to research the question “Is the northern range overgrazed?” The funds were used to support “40 separate research projects” (Singer 1989) both by National Park ...
Стр. 18
Вы достигли ограничения на просмотр для этой книги.
Вы достигли ограничения на просмотр для этой книги.
Содержание
1 | |
Part II Elk Population Changes and the Synthesis Design | 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