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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... forage) would limit the elk population without direct human intervention. Predation was included in the 1967 documents as an effective natural control, but was dismissed 4 years later when predation was hypothesized to be a ...
... forage) would limit the elk population without direct human intervention. Predation was included in the 1967 documents as an effective natural control, but was dismissed 4 years later when predation was hypothesized to be a ...
Стр. 10
... forage production. The 1988–89 winter was extremely severe. More than 7,000 northern herd elk (Lemke et al. 1998) moved out of the park in search of winter food. This total was approximately 40% of one herd size estimate (Taper and ...
... forage production. The 1988–89 winter was extremely severe. More than 7,000 northern herd elk (Lemke et al. 1998) moved out of the park in search of winter food. This total was approximately 40% of one herd size estimate (Taper and ...
Стр. 11
... forage in the park portion of the northern range after decades of heavy use by a large herd and need for the animals to forage more widely in search of food. But one might also speculate that establishment of the wolf population in the ...
... forage in the park portion of the northern range after decades of heavy use by a large herd and need for the animals to forage more widely in search of food. But one might also speculate that establishment of the wolf population in the ...
Стр. 21
... forage, and by Singer and colleagues to densitydependent summer predation on calves. In their elegant analysis, Taper and Gogan (2002) showed a difference in form between the density-dependent functions for fertility and adult ...
... forage, and by Singer and colleagues to densitydependent summer predation on calves. In their elegant analysis, Taper and Gogan (2002) showed a difference in form between the density-dependent functions for fertility and adult ...
Стр. 22
... forage supply prevent the northern herd from achieving a “static equilibrium” or “steady state.” I believe the term stationarity is more appropriate for the total absence of change to which I infer the authors are referring, as it can ...
... forage supply prevent the northern herd from achieving a “static equilibrium” or “steady state.” I believe the term stationarity is more appropriate for the total absence of change to which I infer the authors are referring, as it can ...
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