Sökning: "dry tropics"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden dry tropics.

  1. 1. Costs of foraging in a dry tropical environment

    Författare :Mary Molokwu; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; foraging behavior; seasonality; predation risk; granivorous birds; food availability; water; temperature; savannah; dry tropics; energy; secondary compounds; diet selection;

    Sammanfattning : This study evaluates the costs associated with foraging for birds in a savannah woodland area in central Nigeria. Specifically, it looks at the following questions: 1) how does seasonal variability in food and water availability affect the value of resources to birds in dry environments? 2) Does proximity to water affect foraging decisions? What implication will this have in the management of savannah birds? 3) Are tropical birds mostly affected by metabolic or predation costs? 4) What factors affect diet selection in birds and how? 5) How are birds adapted to hot dry environments? I carried out experiments in the field and in an aviary and provided artificial food patches, consisting of feeding trays with seeds mixed in sand or pebbles (in the aviary study). LÄS MER

  3. 2. Intensifying Agricultural Water Management in the Tropics : A cause of water shortage or a source of resilience?

    Författare :Yihun Dile; Johan Rockström; Louise Karlberg; Mekonnen Gebremichael; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Water harvesting; Climate change; Climate variability; Multi criteria evaluation; SWAT; CN; sub-Saharan Africa; Upper Blue Nile; Lake Tana basin; naturresurshushållning; Natural Resources Management;

    Sammanfattning : Frequent climatic shocks have presented challenges for rainfed agriculture in sub-Saharan Africa. Appropriate water management practices are among the solutions to the challenges. The role of water harvesting in achieving sustainable agricultural intensification and specified resilience was explored. LÄS MER

  4. 3. Urban Design and Outdoor Thermal Comfort in Warm Climates. Studies in Fez and Colombo

    Författare :Erik Johansson; Boende och bostadsutveckling; []
    Nyckelord :HUMANIORA; HUMANITIES; marklära; geomorfologi; Fysisk geografi; climatology; cartography; pedology; geomorphology; Physical geography; Urban planning; Urban design; Urban climate; Tropical areas; Thermal comfort; Sri Lanka; Planning regulations; Morocco; Microclimates; Land-use; Fez; Humid tropics; Colombo; Developing countries; Climatic design; Climate; Arid zones; Built environment; Physical planning; kartografi; klimatologi; Town and country planning; Stads- och glesbygdsplanering; Fysisk planering;

    Sammanfattning : In many developing tropical countries, rapid urban growth leads to several problems, including increased thermal stress. This has negative consequences for people's health and well-being, and affects social and commercial outdoor activities negatively. LÄS MER

  5. 4. Aerosol Exchange between Forests and the Atmosphere : Fluxes over a Tropical and a Boreal Forest

    Författare :Lars Ahlm; Douglas Nilsson; David Fowler; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : The main goal of this thesis was to investigate primary biogenic aerosol emission from the Amazon rain forest through measurements of vertical turbulent aerosol number fluxes. In addition, the particle dry deposition sink has been analysed and quantified, and is also compared with the dry deposition sink at a boreal forest site. LÄS MER

  7. 5. Forests and Water - Friends or Foes? : Hydrological implications of deforestation and land degradation in semi-arid Tanzania

    Författare :Klas Sandström; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : This is a study of landscape hydrology; a type of hydrology which focuses on large sca1e implications of hydrologica1 processes as a function of hydroclimate, surface and sub-surface land properties, and the effect of human activities. The focus of the thesis is groundwater recharge and dry season flow following deforestation and land degradation. LÄS MER