Sökning: "river margin"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden river margin.

  1. 1. Effects of climate change on boreal wetland and riparian vegetation

    Detta är en avhandling från Institutionen för ekologi, miljö och geovetenskap, Department of Ecology and Environmental Sciences

    Författare :Lotta Ström; Umeå universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biomass; flooding; hydrologic niche; invasibility; riparian zone; riparian plant species; river margin; climate scenario; seed sowing experiment; species composition; species richness; transplant experiment; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Terrestrial ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Terrestrisk ekologi;

    Sammanfattning : Models of climate change predict that temperature will increase during the 21th century and the largest warming will take place at high northern latitudes. In addition to warming, predictions for northern Europe include increased annual precipitation and a higher proportion of the precipitation during winter falling as rain instead of snow. LÄS MER

  2. 2. The function of seasonal habitat shifts in two congeneric mayflies in a boreal river

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Olle Söderström; Umeå universitet.; [1988]
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Habitat utilization; diel activity; orientation; predation; life-history; temperature; food quality; mayflies; Parameletus chelifer; Parameletus minor;

    Sammanfattning : Unregulated North Swedish rivers show large seasonal variations in their physical characteristics. During winter the whole littoral zone freezes solid, and in spring the water flow increases rapidly and the same areas become flooded. The two mayflies Parameletus chelifer and P. minor are common in the North Swedish river Vindelälven. LÄS MER

  3. 3. Finding a place for green politics : political space-time, globalisation and new environmental policy concepts

    Detta är en avhandling från Umeå : Statsvetenskapliga institutionen, Umeå universitet

    Författare :Lovisa Hagberg; Umeå universitet.; [2003]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Political science; space-time; political time; bioregionalism; green political theory; place; river basin management; critical loads; ‘think global; act local’; globalisation; Statsvetenskap; SOCIAL SCIENCES Social sciences Political science; SAMHÄLLSVETENSKAP Socialvetenskap Statsvetenskap; statskunskap; statskunskap;

    Sammanfattning : The overarching aim of this dissertation is to rethink green ideas for change in political space-time against the background of globalisation. It is based on two avenues of investigation. First, green ideas are contrasted with the analyses of current changes in political space-time found in the globalisation literature. LÄS MER

  4. 4. Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Henning Lorenz; Uppsala universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Arctic; Severnaya Zemlya; North Kara Terrane; Baltica; bedrock; geology; tectonics; Timanides; Caledonides; Geovetenskap; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap;

    Sammanfattning : The North Kara Terrane (NKT), with Severnaya Zemlya as its main outcrop area, constitutes the Palaeozoic and older rocks of the northern part of the Kara Shelf. Potential field data suggest a continuation into the eastern Barents Shelf. LÄS MER

  5. 5. Palaeoglaciology of the northeastern Tibetan Plateau

    Detta är en avhandling från Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University

    Författare :Jakob Heyman; Stockholms universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Tibetan Plateau; palaeoglaciology; NATURAL SCIENCES Earth sciences Exogenous earth sciences Physical geography; NATURVETENSKAP Geovetenskap Exogen geovetenskap Naturgeografi; NATURAL SCIENCES Earth sciences Exogenous earth sciences Quaternary geology; NATURVETENSKAP Geovetenskap Exogen geovetenskap Kvartärgeologi; Physical Geography; naturgeografi;

    Sammanfattning : This study concerns the palaeoglaciation of the northeastern Tibetan Plateau, with emphasis on the Bayan Har Shan (Shan = Mountain) in the headwaters of Huang He (Yellow River). To reconstruct past glacier development multiple techniques, including remote sensing, field investigations, cosmogenic exposure dating, and numerical modelling have been employed. LÄS MER