Sökning: "river"

Visar resultat 1 - 5 av 455 avhandlingar innehållade ordet river.

  1. 1. Ljungan : vattenbyggnader i den näringsgeografiska miljön 1550-1940

    Författare :Perola Nordberg; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; HUMANIORA; HUMANITIES;

    Sammanfattning : .... LÄS MER

  3. 2. Iron in the Lena River basin, NE Russia : Insights from microscopy, spectroscopy and isotope analysis

    Författare :Catherine Hirst; Carl-Magnus Mörth; Per Andersson; Mats Erik Åström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iron; reactivity; isotopes; permafrost; river; Arctic; Marine Geology; maringeologi;

    Sammanfattning : Iron is an important mediator of biotic and abiotic processes on the Earth’s surface, being an electron acceptor in organic matter degradation, a surface for organic matter and trace element adsorption, and a required element for enzymatic processes during primary production. Yet, the role of iron as a mediator of carbon and trace element cycling in high latitude, permafrost-dominated regions remains poorly investigated. LÄS MER

  4. 3. Indirect effects of river regulation : consequences for landbirds of reduced numbers of aquatic insects

    Författare :Darius Strasevicius; Björn Malmqvist; Tapio Eeva; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Boreal region; Simuliidae; Leucocytozoon; pied flycatcher; aquatic insects; breeding success; blood parasites; bird communities; river regulation; impoundment; Biology; Biologi;

    Sammanfattning : Abstrakt: Jag har undersökt hur älvreglering påverkar mängden knott (Tvåvingar: Simuliidae) längs flera norrlandsälvar och vilka konsekvenser denna påverkan får för den landlevande fågelfaunan. Studien visar att utbyggnad av älvar har en negativ effekt på mängden knott. LÄS MER

  5. 4. A Spatial Scale Approach to Fish Habitat Ecology and Impacted Rivers

    Författare :Henry H. Hansen; Eva Bergman; Max Lindmark; Dana Infante; Karlstads universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fish Habitat Models; River Ecology; Novel Riverscapes; Spatial Scale; Fish Communities; Anthropogenic Impacts; Sustainability; River Management; River Restoration; Biology; Biologi;

    Sammanfattning : Fish biodiversity in rivers is threatened by continual habitat loss. Evidence to support management and restoration of rivers requires information about the specific habitat requirements for entire fish communities. LÄS MER

  7. 5. Environmental considerations in the planning of large dam projects : a study on Environmental Impact Statements and the Southeastern Anatolia Project

    Författare :Anna Brismar; Jan-Olof Lundqvist; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Atatürk Dam. EIA; ecosystem services; environmental impact; Euphrates River; GAP; hydropower; river system; sustainable development; Tigris River; Turkey; Dammar; Miljöaspekter; Tigris; Turkiet; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : Large dam projects have played a key role in supporting societal development in the past and continue to be launched, primarily in developing countries. However, large dam projects also cause extensive environmental impacts in the river system, which may reduce the river system's capacity to provide goods, services, and other values apart from those generated by the project. LÄS MER