Köln, Universiẗat, Diss., 2002.

No description available.

This dissertation considers the exchanges between national parks along the North American borderlands that defined the contours of development and wilderness and created a brand new category of protected space -- the transboundary park. The National Park Systems of Canada, Mexico, and the United States did not develop and grow in isolation. "Bordering North America" examines four different parks in two regions: Waterton Lakes and Glacier in the northern Rocky Mountains of Alberta and Montana and Big Bend and the Maderas del Carmen in the Chihuahuan Desert of Texas and Coahuila. In 1932, Glacier and Waterton Lakes were combined to form the first transboundary park. In the 1930s and 1940s, using the Waterton-Glacier model as precedent, the U.S. and Mexican governments undertook a major effort, ultimately unsuccessful, to designate a sister park in Mexico and combine the two areas into another international space. Finally, in 1994, Mexico established two protected areas, including the Maderas del Carmen, adjacent to the Big Bend. Ideas about parks and wilderness migrated across borders just as freely as the flora and fauna these spaces sought to protect. Moreover, a multiplicity of views and forces, from three different Park Services, the visiting public, private enterprise, local landholders, competing government agencies and international NGOs, and even the elements of nature itself, all combined to shape the trajectory of park development. / text

Thesis (M.A.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 186-198).

Greifswald, Universiẗat, Diss., 2004.

Hannover, Universiẗat, Diss., 2003.

Köln, University, Diss., 2003. / Dateiformat: tgz, Dateien im PDF-Format.

Rising demand for medicinal plants has led to increased pressure on wild plant populations. This, combined with shrinking habitats, means that many species in South Africa are now facing local extinction. In 1997, a study was initiated to determine the extent of trade in medicinal plants in the South African Lowveld (the low lying plains to the east of the Drakensberg escarpment), and to investigate socio-economic factors influencing trade and resource management. Trade was not as extensive in the Lowveld as in major urban markets such as Durban or the Witwatersrand (Johannesburg and surrounding towns), either in terms of the quantity, number or range of species sold, or the numbers of people relying on the trade for an income. In markets assessed in Mpumalanga Province, 176 species were identified (71% of the vernacular names encountered in the market place), representing 69 plant families. In Limpopo, 70 different species were identified (84% of the vernacular names encountered in the market place), representing 40 families. Imports were significant in Mpumalanga (33% of the plants on offer), mainly from Mozambique. A detrended correspondence analysis showed substantial differences between species traded in Mpumalanga and those sold in Limpopo. There was little variation in the species stocked by vendors in Mpumalanga, regardless of the season, the attributes of the seller, or whether business was carried out in urban or rural areas. In contrast, there was considerable variation in the stock inventories of the Limpopo traders. Despite the lower levels of local trade, increased harvesting pressure is being experienced regionally, to meet demand in metropolitan centres such as the Witwatersrand. This study showed considerable local variation and complexities in the harvesting and marketing of medicinal plants, with both a national and an international dimension. This dual spatial scale presents both opportunities and challenges in the management of these plants, which need to be addressed simultaneously, particularly with respect to research requirements and development of predictive models and capacity. Cooperation in conservation strategies and policies is required at regional, national and international levels, while ensuring that management initiatives take into account local market conditions and the socio-economic realities facing both consumers and those who depend on the trade for their livelihoods.

No description available.

Thesis (M.S.)--Montana State University--Bozeman, 2004. / Typescript. Chairperson, Graduate Committee: William Wyckoff. Includes bibliographical references (leaves 342-356).