Search for dissertations about: "Carbon and nitrogen isotopes"

Showing result 11 - 15 of 25 swedish dissertations containing the words Carbon and nitrogen isotopes.

  2. 11. The influence by point sources on carbon, nitrogen and metals in two sedimentary environments

    Author : Hanna Bohlin; Nils Holm; Carl-Magnus Mörth; Gunnar Jacks; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap;

    Abstract : Sediments in two aquatic environments have been investigated. Both are anthropogenically affected and polluted. The focus has been on stable carbon and nitrogen isotopes, C/N ratios, and heavy metals. The first site is Höggarnsfjärden Bay in the inner parts of the Stockholm Archipelago, Sweden, where a garbage dump releases treated leach water. READ MORE

  4. 12. Nitrogen-cycling tracing methods : Case studies at cold-climate mine sites in northern Sweden

    Author : Lino Nilsson; Anders Widerlund; Andreas Bryhn; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Applied Geochemistry; Tillämpad geokemi;

    Abstract : High nitrogen effluents from mine sites is an environmental issue which has received relatively little attention historically. In recent years a number of studies have showed the environmental effects of high nitrogen discharge to natural water bodies, which include local eutrophication, high risk of acute reducing conditions and changed species composition in the receiving waters. READ MORE

  5. 13. The Spider and the Sea : Effects of marine subsidies on the role of spiders in terrestrial food webs

    Author : Kajsa Mellbrand; Peter Hambäck; Lena Kautsky; David Wise; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; marine subsidies; food webs; stable isotopes; shore ecosystems; predators; spiders; Pardosa; algae; emerging insects; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Plant Ecology; växtekologi;

    Abstract : The purpose of this study was to identify if terrestrial arthropod predators on Baltic Sea shores vary in their use of marine versus terrestrial food items, and to construct a bottom-up food web for Baltic Sea shores. The inflow of marine nutrients in the area consists mainly of marine algal detritus and emerging aquatic insects (e.g. READ MORE

  6. 14. On Death in the Mesolithic : Or the Mortuary Practices of the Last Hunter-Gatherers of the South-Western Iberian Peninsula, 7th–6th Millennium BCE

    Author : Rita Peyroteo Stjerna; Kjel Knutsson; Mariana Diniz; Liv Nilsson Stutz; Clive Bonsall; Uppsala universitet; []
    Keywords : HUMANIORA; HUMANITIES; death; Late Mesolithic; hunter-gatherers; social memory; place; burial practices; mortuary ritual; historical process; south-western Iberian Peninsula; archaeothanatology; radiocarbon dating and Bayesian analysis; stable isotopes carbon and nitrogen ; shell middens; museum collections; Archaeology; Arkeologi;

    Abstract : The history of death is entangled with the history of changing social values, meaning that a shift in attitudes to death will be consistent with changes in a society’s world view.Late Mesolithic shell middens in the Tagus and Sado valleys, Portugal, constitute some of the largest and earliest burial grounds known, arranged and maintained by people with a hunting, fishing, and foraging lifestyle, c 6000–5000 cal BCE. READ MORE

  7. 15. Subarctic ecosystem responses to climate, catchment and permafrost dynamics in the Holocene

    Author : Ulla Kokfelt; Kvartärgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; subarctic Sweden; palsa mire development; peat; permafrost history; carbon and nutrient cycling; lake sediments;

    Abstract : This thesis assesses aspects of the wetland development, permafrost dynamics and associated changes in carbon and nutrient cycling of the Stordalen Mire in northern Sweden. Various ecological and biogeochemical analyses of one peat and two lake sediment sequences were conducted, including analyses of organic matter and carbonate content, mosses, diatoms, testate amoebae, pigments, carbon and nitrogen and their stable isotopes, near infrared spectroscopy and biogenic silica. READ MORE