Download or read book Disturbance and Climate Change in United States Mexico Borderland Plant Communities written by Guy Randall McPherson and published by . This book was released on 2000 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research has been valuable for documenting changes in vegetation and identifying candidate explanations for observed changes. However, because descriptive research is generally inappropriate for testing hypotheses, we outline and describe a strategy for hypothesis-testing and provide recommendations for future research in the borderlands. Implications for management are also outlined in this paper.
Download or read book Disturbance and Climate Change in United States Mexico Borderland Plant Communities written by Guy Randall McPherson and published by . This book was released on 2000 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review evaluates the effects and importance of disturbance and climate change on plant community dynamics in the United States/Mexico borderlands region. Our primary focus is on knowledge of physiognomic-level change in grasslands and woodlands of southeastern Arizona and southwestern New Mexico. Changes in vegetation physiognomy have broad implications for management and land use in the borderlands. Historically, livestock grazing and fire were the dominant disturbances in borderland ecosystems. Livestock grazing accelerates the rate of establishment and growth of woody plants (notably mesquite) in the borderlands region. However, the current role of livestock grazing in this region may be considerably less important than the historic role. Excluding livestock from grasslands now would not prevent, and may not delay, a substantial increase in woody plant abundance. In general, frequent fires are detrimental to woody plants and beneficial to Lehmann lovegrass. Although fires favor herbaceous plants at the expense of woody plants, woody plant dominance on many sites precludes the deliberate application of fire without first using chemical or mechanical treatments. Climate change is perhaps the most critical factor facing the current generation of land managers who are concerned about the future condition of borderlands ecosystems. Rising concentrations of CO2 and other trace gases have the potential to replace grazing and fire suppression as important regulators of vegetation change. Increased atmospheric CO2 concentrations may contribute to increased abundance of woody plants in borderlands grasslands, particularly if these increases are accompanied by shifts in seasonal precipitation or other climatic factors. Much of the knowledge garnered about borderlands plant communities is derived from descriptive research such as comparative studies and "natural" experiments. This research has been valuable for documenting changes in vegetation and identifying candidate explanations for observed changes. However, because descriptive research is generally inappropriate for testing hypotheses, we outline and describe a strategy for hypothesis-testing and provide recommendations for future research in the borderlands. Implications for management are also outlined in this paper.
Download or read book General Technical Report RMRS written by and published by . This book was released on 1998 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Responses of Plant Communities to Grazing in the Southwestern United States written by Daniel G. Milchunas and published by . This book was released on 2006 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings RMRS written by and published by . This book was released on 1998 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Personal Societal and Ecological Values of Wilderness written by and published by . This book was released on 1998 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Connecting Mountain Islands and Desert Seas written by and published by . This book was released on 2005 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Note RMRS written by and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Bibliography for the Northern Madrean Biogeographic Province written by and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: An online bibliography was compiled to furnish a literature basis for implementing of land management activities and planning research endeavors in the Madrean Biogeographic Province, which includes the Madrean Archipelago region in the southwestern United States. Citations are listed alphabetically by author in categories appropriate to the subject-matter presented. The large number of citations preclude hard-copy publication. The complete bibliography is available on the USDA Forest Service, Rocky Mountain Research Station's Flagstaff office web site at www.rmrs.nau.edu/publications/madrean.
Download or read book A Bibliography for the Northern Madrean Biogeographic Province written by Peter F. Ffolliott and published by . This book was released on 1999 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cross Border Waters written by and published by . This book was released on 1998 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a series of scholary papers on environmental issues facing the Mexican American Border Region, presented at the 1998 U.S./Mexico Border States Conference on Recreation, Parks, and Wildlife in Tucson.
Download or read book Ranching Endangered Species and Urbanization in the Southwest written by Nathan F. Sayre and published by University of Arizona Press. This book was released on 2006-02 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ranching is as much a part of the West as its wide-open spaces. The mystique of rugged individualism has sustained this activity well past the frontier era and has influenced how we viewÑand valueÑthose open lands. Nathan Sayre now takes a close look at how the ranching ideal has come into play in the conversion of a large tract of Arizona rangeland from private ranch to National Wildlife Refuge. He tells how the Buenos Aires Ranch, a working operation for a hundred years, became not only a rallying point for multiple agendas in the "rangeland conflict" after its conversion to a wildlife refuge but also an expression of the larger shift from agricultural to urban economies in the Southwest since World War II. The U.S. Fish and Wildlife Service bought the Buenos Aires Ranch in 1985, removed all livestock, and attempted to restore the land to its "original" grassland in order to protect an endangered species, the masked bobwhite quail. Sayre examines the history of the ranch and the bobwhite together, exploring the interplay of social, economic, and ecological issues to show how ranchers and their cattle altered the landÑfor better or worseÑduring a century of ranching and how the masked bobwhite became a symbol for environmentalists who believe that the removal of cattle benefits rangelands and wildlife. Sayre evaluates both sides of the Buenos Aires controversyÑfrom ranching's impact on the environment to environmentalism's sometimes misguided efforts at restorationÑto address the complex and contradictory roles of ranching, endangered species conservation, and urbanization in the social and environmental transformation of the West. He focuses on three dimensions of the Buenos Aires story: the land and its inhabitants, both human and animal; the role of government agencies in shaping range and wildlife management; and the various species of capitalÑeconomic, symbolic, and bureaucraticÑthat have structured the activities of ranchers, environmentalists, and government officials. The creation of the Buenos Aires National Wildlife Refuge has been a symbolic victory for environmentalists, but it comes at the cost of implicitly legitimizing the ongoing fragmentation and suburbanization of Arizona's still-wild rangelands. Sayre reveals how the polarized politics of "the rangeland conflict" have bound the Fish and Wildlife Service to a narrow, ineffectual management strategy on the Buenos Aires, with greater attention paid to increasing tourism from birdwatchers than to the complex challenge of restoring the masked bobwhite and its habitat. His findings show that the urban boom of the late twentieth century echoed the cattle boom of a century beforeÑcapitalizing on land rather than grass, humans rather than cattleÑin a book that will serve as a model for restoration efforts in any environment.
Download or read book General Technical Report RM written by and published by . This book was released on 1996 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bird Conservation Implementation and Integration in the Americas written by and published by . This book was released on 2005 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Climate Variability and Ecosystem Response at Long term Ecological Research Sites written by David Greenland and published by Oxford University Press, USA. This book was released on 2003 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the work that has been done and the understanding and database that have been developed by work on climate change done at the Long-Term Ecological Research (LTER) sites. This book pulls together information from all 20 research sites.
Download or read book General Technical Report PSW written by and published by . This book was released on 2005 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conservation of Shared Environments written by Laura L—pez-Hoffman and published by University of Arizona Press. This book was released on 2009 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States and MexicoÕs shared environment extends far beyond the political line. For instance, it comprises the plant and animal species whose natural distributions extend deep into each nation along with the waters in rivers and aquifers that support ecosystem function far removed from the border. Conservation of Shared Environments presents a broad perspective on the ecological, social and political challenges of conserving biodiversity across the U.S.-Mexico border. Covering topics as diverse as wildlife and grassland preservation, water rights, ecosystem services, indigenous peoples, and the ecological consequences of border security, the contributors illustrate collaborative, transboundary efforts to overcome cross-border conservation challenges. This volume offers scientific analysis as well as insight for bridging gaps between researchers, policymakers, and the public. For more information on this and other volumes in the series, visit The Edge Web site.
