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Mostrando ítems 1 a 9 de 24.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    África occidental

    Modern global temperature and land cover and projected future temperatures suggest that tropical forest species will be particularly sensitive to global warming. Given a moderate greenhouse gas emissions scenario, fully 75% of the tropical forests present in 2000 will experience mean annual temperatures in 2100 that are greater than the highest mean annual temperature that supports closed-canopy forest today. Temperature-sensitive species might extend their ranges to cool refuges, defined here as areas where temperatures projected for 2100 match 1960s temperatures in the modern range.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2015
    Sudáfrica, África austral

    Private land conservation is an increasingly popular approach to protect critical biodiversity. In the Western Cape Province of South Africa private land conservation is the focal strategy for CapeNature, the provincial conservation agency. Despite its importance, little is known about the drivers of landowner participation in the CapeNature program and how these varied motivations influence participant satisfaction and retention.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2006
    Kenya

    There exists gender bias in resource ownership in many parts of Kenya with women being more disadvantaged. Resource ownership and control within the household has differential impacts on the health and overall well-being of male and female members. This paper examines intra-household resource ownership and how it affects nutrition and health status of household members. Data from a household survey containing detailed gender-disaggregated information on resource ownership as well as food and anthropometry were collected from a rural Kenyan district and used in the analysis.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Botswana

    Dual‐scale analyses assessing farm‐scale patterns of ecological change and landscape‐scale patterns of change in vegetation cover and animal distribution are presented from ecological transect studies away from waterpoints, regional remotely sensed analysis of vegetation cover and animal numbers across the southern Kalahari, Botswana. Bush encroachment is prevalent in semi‐arid sites where Acacia mellifera Benth. is widespread in communal areas and private ranches, showing that land tenure changes over the last 40 years have not avoided rangeland degradation.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 2007
    Etiopía

    This article investigates the effects of wheat genetic diversity and land degradation on risk and agricultural productivity in less favored production environments of a developing agricultural economy. Drawing production data from a household survey conducted in the highlands of Ethiopia, we estimate a stochastic production function to evaluate the effects of variety richness, land degradation, and their interaction on the mean and the variance of wheat yield. Ethiopia is a center of diversity for durum wheat and farmers manage complex variety mixtures on multiple plots.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Sudáfrica, África austral

    1. The progression of approaches in systematic conservation planning from representation to representation and persistence has greatly enhanced its potential applicability to freshwaters. However, conceptual frameworks that consolidate principles for incorporating persistence into freshwater conservation planning are still lacking. 2.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2015
    Etiopía

    Land use/land cover changes in a lake drainage basin reflect changes in the magnitude of the water balance components and rate of sediment deposition in a lake as a reflection of the fundamental linkage between what happens in a lake considered against what is happening in the drainage basin of the lake. The objective of this study was to quantify the spatio‐temporal land cover/land use changes across the Lake Hayq closed drainage basin in north‐east Ethiopia over a 50‐years period, using multitemporal remote sensing and geospatial data.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Tanzania

    Vegetation data in an early 20th century map from northern Tanzania are presented and discussed for its potential of expanding the analytical time-frame in studies of land-use and land-cover change. The starting point is that much research on land-use and land-cover change suffers from a time-frame bias, caused by limitations in remote sensing data. At the same time, the use of historical maps as a complementary data-set is rather insignificant. Can information in historical maps be used to extend the baseline in land-use and land-cover change studies?

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Kenya, África

    A rapid assessment survey on the occurrence and distribution of protosteloid amoebae was carried out in central Kenya. Samples of dead plant materials were collected from 46 study sites (each 20 x 20 m) situated along an elevation gradient (1,785-3,396 m) that encompassed five major land use/cover types. Twenty-four species and subspecific taxa were recovered and included 23 protostelids and one minute myxomycete, often included in surveys for protostelids. All of these were the first records for Kenya, and six were new for Africa.

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