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Showing items 1 through 9 of 23.
  1. Library Resource
    Journal Articles & Books
    December, 2003
    United States of America

    Early-successional habitats (e.g. grasslands, shrublands, and early-successional forests) and their associated wildlife are declining throughout the northeastern United States. State wildlife agencies are generally charged with conserving all native wildlife and their habitats within their respective state. However, some have suggested that state wildlife agencies in the region are not addressing the decline of early-successional wildlife and habitats sufficiently.

  2. Library Resource
    Journal Articles & Books
    December, 2003
    Argentina

    Since the early 1990s, Argentinean grain production underwent a dramatic increase in grains production (from 26 million tons in 1988/89 to over 75 million tons in 2002/2003). Several factors contributed to this "revolution," but probably one of the most important was the introduction of new genetic modification (GM) technologies, specifically herbicide-tolerant soybeans.

  3. Library Resource
    Journal Articles & Books
    December, 2003
    United States of America

    Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of this problem. Fires also can have substantial effects on streams and riparian systems and may threaten the persistence of some populations of fish, particularly those that are small and isolated.

  4. Library Resource
    Journal Articles & Books
    December, 2003
    Honduras

    This study evaluates the relationship between landscape accessibility and land cover change in Western Honduras, and demonstrates how these relationships are influenced by social and economic processes of land use change in the region. The study area presents a complex mosaic of land cover change processes that involve approximately equal amounts of reforestation and deforestation.

  5. Library Resource
    Journal Articles & Books
    December, 2003
    Mexico

    Coastal land use and land cover changes, emphasizing the alterations of coastal lagoons, were assessed in northwest Mexico using satellite imagery processing. Supervised classifications of a Landsat series (1973–1997) and the coefficients Kappa (K) and Tau (τ), were used to assess the area and verify the accuracy of the classification of six informational classes (urban area, aquatic systems, mangrove, agriculture, natural vegetation, and aquaculture). Pixel-by-pixel change detection among dates was evaluated using the Kappa Index of Agreement (KIA).

  6. Library Resource
    Journal Articles & Books
    December, 2003
    Nicaragua

    The natural environment in Nicaragua has been damaged by rural development policies geared for the export of cash crops, by uneven land distribution and the near absence of concerns about the environmental effects of the prevailing model of development. The demands made by market forces for the export of primary materials have been reasons for land degradation in the big farms, and the need to survive a poverty stricken existence has forced the peasantry to damage the marginal and fragile land they worked.

  7. Library Resource
    Policy Papers & Briefs
    December, 2003
    United States of America

    Changes in the use of land in the United States produce significant economic and environmental effects with important implications for a wide variety of policy issues, including protection of wildlife habitat, management of urban growth, and mitigation of global climate change. In contrast to previous descriptive and qualitative analyses of the trends in national land use, this paper uses an econometric approach to isolate the importance of historical changes in land-use profits and key government policies in determining national land-use changes from 1982 to 1997.

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