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Displaying 961 - 965 of 1195

Effects of land cover on chemical characteristics of streams in the Cerrado region of Brazil

Journal Articles & Books
Dezembro, 2011
Brasil

The Cerrado is the second largest Brazilian biome and contains the headwaters of three major hydrological basins in Brazil. In spite of the biological and ecological relevance of this biome, there is little information about how land use changes affect the chemistry of low-order streams in the Cerrado. To evaluate these effects streams that drain areas under natural, rural, and urban land cover were sampled near Brasília, Brazil. Water samples were collected between September 2004 and December 2006. Chemical concentrations generally followed the pattern of Urban > Rural > Natural.

Agricultural Development and Associated Environmental and Ethical Issues in South Asia

Journal Articles & Books
Dezembro, 2011
Ásia
Ásia Meridional

South Asia is one of the most densely populated regions of the world, where despite a slow growth, agriculture remains the backbone of rural economy as it employs one half to over 90 percent of the labor force. Both extensive and intensive policy measures for agriculture development to feed the massive population of the region have resulted in land degradation and desertification, water scarcity, pollution from agrochemicals, and loss of agricultural biodiversity.

Forgotten forests - issues and prospects in biome mapping using Seasonally Dry Tropical Forests as a case study

Journal Articles & Books
Dezembro, 2011
Américas
América Central
América do Sul

BACKGROUND: South America is one of the most species diverse continents in the world. Within South America diversity is not distributed evenly at both local and continental scales and this has led to the recognition of various areas with unique species assemblages. Several schemes currently exist which divide the continental-level diversity into large species assemblages referred to as biomes.

Preferences for wildlife management methods among the peri-urban public in Scotland

Journal Articles & Books
Dezembro, 2011

Wildlife management remains a matter of considerable controversy amongst many stakeholders, particularly where lethal control (culling) is used. Wild deer provide perhaps one of the best examples of such a management ‘problem’, especially where they are encountered in peri-urban environments. Faced with potential controversy, decision-makers in public land management organisations need information which clearly differentiates between generally acceptable management objectives and methods, and less mainstream preferences.

Estimation of late twentieth century land-cover change in California

Journal Articles & Books
Dezembro, 2011
Estados Unidos

We present the first comprehensive multi-temporal analysis of land-cover change for California across its major ecological regions and primary land-cover types. Recently completed satellite-based estimates of land-cover and land-use change information for large portions of the United States allow for consistent measurement and comparison across heterogeneous landscapes. Landsat data were employed within a pure-panel stratified one-stage cluster sample to estimate and characterize land-cover change for 1973-2000.