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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 372.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Argentina

    We analysed coexistence patterns between two mesocarnivores, Geoffroy's cat (Leopardus geoffroyi: Felidae) and culpeo fox (Pseudalopex culpaeus: Canidae), in northern Patagonia, Argentina. We examined spatial distribution influenced by land cover, anthropogenic disturbance and invasive hare presence, and analysed temporal activity patterns and dietary composition. If competitive exclusion accounts for carnivore coexistence in this system, we predicted segregation would occur in one or more of these aspects as a mechanism for coexistence.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2006
    Finlandia

    We explored the relative contributions of climatic and land-cover factors in explaining the distribution patterns of butterflies in a boreal region. Finland, northern Europe. Data from a national butterfly atlas survey carried out during 1991-2003, with a 10-km grain grid system, were used in these analyses. We used generalized additive models (GAM) and hierarchical partitioning (HP) to explore the main environmental correlates (climate and land-cover) of the realized niches of 98 butterfly species.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014

    Agroecosystems are increasingly recognized as both sources and sinks of non‐native weedy plant species as well as of native plant species, thus management of these systems has important implications for the composition of plant communities and landscape diversity. We quantified the distribution and abundance of both native and non‐native plant species along a habitat gradient representing four management zones: managed agroecosystem, the agroecosystem boundary, ecotone, and neighbouring native forest for two land uses: kiwifruit orchards and neighbouring grassland agroecosystems.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2007
    Ecuador, Bolivia, Brasil, Venezuela, Colombia, Perú

    To provide a quantitative spatial analysis of the riverscape (open-water bodies and their surrounding areas) of the Western Amazonian lowlands using a consistent surface of remotely sensed imagery. Taking into account the essential significance of fluvial environments for the Amazonian biota, we propose that an enhanced understanding of the Amazonian riverscape will provide new insight for biogeographical studies in the region and contribute to the understanding of these megadiverse tropical lowlands.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 2010
    Australia

    Encroachment or densification by woody plants affects natural ecosystems around the world. Many studies have reported encroachment in temperate Australia, particularly in coastal ecosystems and grassy woodlands. However, the degree to which published studies reflect broad-scale changes is unknown because most studies intentionally sampled areas with conspicuous densification.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Honduras

    In the aftermath of Hurricane Mitch, one woman's impassioned speech linking women's exclusion from land rights with the failings of Honduras' state-led agrarian reform and counter-reform gathered gale force, simultaneously weakening particular levees of gender-bias while constructing others. Post-Hurricane Mitch organizational practices and reconstruction policies in Northeastern Honduras afforded women access to joint property titles and participation.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014

    The agriculture, forestry and other land use (AFOLU) sector is responsible for approximately 25% of anthropogenic GHG emissions mainly from deforestation and agricultural emissions from livestock, soil and nutrient management. Mitigation from the sector is thus extremely important in meeting emission reduction targets. The sector offers a variety of cost‐competitive mitigation options with most analyses indicating a decline in emissions largely due to decreasing deforestation rates.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014

    Dietary researchers need new software to improve nutrition data collection and analysis, although the creation of information technology is difficult. Software development projects may be unsuccessful as a result of an inadequate understanding of needs, management problems, technology barriers or legal hurdles. Cost over‐runs and schedule delays are common. Barriers facing scientific researchers developing software include workflow, cost, schedule and team issues. Different methods of software development and the role that intellectual property rights play are discussed.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011

    1. For north temperate lakes, the well-studied empirical relationship between phosphorus (as measured by total phosphorus, TP), the most commonly limiting nutrient and algal biomass (as measured by chlorophyll a, CHL) has been found to vary across a wide range of landscape settings. Variation in the parameters of these TP-CHL regressions has been attributed to such lake variables as nitrogen/phosphorus ratios, organic carbon and alkalinity, all of which are strongly related to catchment characteristics (e.g. natural land cover and human land use).

  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 2010
    Estados Unidos de América

    Recovering biodiversity is a common goal during restoration; however, for many ecosystems, it is not well understood how restoration influences species diversity across space and time. I examined understory species diversity and composition after woody encroachment removal in a large-scale savanna restoration experiment in central Iowa, United States. Over a 4-year time series, restoration had profound effects across space and time, increasing richness at local and site-level scales.

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