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Mostrando ítems 1 a 9 de 24.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011
    Madagascar, Kenya, África

    Protected Areas (PAs) form a core component of efforts to conserve biodiversity, but are designated for a variety of reasons. We assessed the effectiveness of PAs in covering the ranges of 157 globally threatened terrestrial bird species in mainland Africa and Madagascar. To reduce commission errors, rather than using Extent of Occurrence (EOO) as a measure of distribution, we estimated the Extent of potentially Suitable Habitat (ESH) for each species within its EOO, using data on habitat preferences and land cover.

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

    To highlight and examine apparent paradoxes in assessing the effectiveness of different forms of land-use for biodiversity conservation. Tanzania. We compare and contrast the findings of two recent and seemingly conflicting studies on the effectiveness of conservation protection strategies in Tanzania. We evaluate these studies in the context of a wider body of evidence relating to the problem of determining protected area performance.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Uganda

    The paper is based on an on-going 3-year study in the wetland communities of Kampala. The study uses participatory methods and aims to contribute to (i) the development of low-income wetland communities, (ii) to prepare these communities to become less dependent on wetlands without receding into poverty, and (iii) the better management of the wetlands. The communities in direct dependence and intimate interaction with Nakivubo wetlands are mainly poor, live and work under hazardous conditions, and their activities pose a threat to the ecological function of the wetlands.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    Tanzania

    AIM: We map estimated historical population declines resulting from species‐specific models of sensitivity to habitat fragmentation for three forest‐dependent chameleons. LOCATION: East Usambara Mountains, Eastern Arc Mountains, Tanzania. METHODS: We surveyed three chameleon species (Rhampholeon spinosus, Rhampholeon temporalis and Trioceros deremensis) along 32.2� km of transects and used a hierarchical, distance‐sampling model to estimate densities. The model included habitat characteristics at the landscape (patch) and local (transect) scales while accounting for detectability.

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

    While the decrease in flow is obvious in the Kikuletwa River, the mechanism leading to the decrease is unclear. We assessed the influence of vegetation cover change on dry season flow in the Kikuletwa River. The combined cover of closed and open forests decreased by 68% while closed and open forests decreased by 56% and 64% respectively. Land under agroforestry decreased by 25%, while that under annual crops increased by 41%. Grasslands increased by 116% and riverine vegetation decreased by 53%.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Sudáfrica, África austral

    This study determined the effects of land-use practice had on the rate and extent of bush encroachment in a mesic savanna in KwaZulu-Natal, South Africa. Changes in woody cover were measured for 1 km² sites in areas under communal, commercial and conservation land-use systems for the period between 1937 and 2000. Land users from each area were interviewed to gain the histories of each area and to determine how the changes in woody cover had impacted them and whether anything was being done to counteract the spread of trees and shrubs on their land.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Nigeria

    Frequent alteration in land cover often leads to decreased stability of ecosystems which can also increase the vulnerability of rural communities to externalities of environmental change. This study carried out in parts of the coast of southwestern Nigeria utilized topographic base maps and two-time Landsat TM imageries to assess the trend in land cover changes and ecosystems degradation for the three time periods 1965, 1986 and 2001. Remote sensing, geographic information systems and landscape pattern analysis were employed for data processing and analysis.

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

    This paper examines the changes in land use/cover types in the degraded environment of central Tanzania over the last 45 years, and how such changes have influenced agricultural and livelihoods sustainability, especially in the Irangi Hills. Changes of land use/cover were measured through aerial photographs interpretations, while local perceptions and description of change were addressed through household interviews and field observations. The results of this study show that there have been variations over the years in terms of both the areas and spatial distribution of cultivated fields.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2012
    Nigeria

    The study assessed poverty in rural areas of Ogun State, Nigeria through the food energy (calorie) intake approach. A sample of 60 households (comprising of 346 members) were selected using a multistage sampling technique and were interviewed with the aid of well‐structured questionnaire. Data were analysed using nutrient estimation techniques, cost of calorie method and poverty index. The estimated food poverty line was 64.72 naira.

  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 2008
    Uganda, África

    While the need for land-related investment for sustainable land management and increased productivity is well recognized, quantitative evidence on agricultural productivity effects of secure property rights in Africa is scant. Within-household analysis of investments by owner-cum-occupants in Uganda points toward significant and quantitatively large investment effects of full ownership. Registration is estimated to have no investment effects, whereas measures to strengthen occupancy rights attenuate investment disincentives.

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