Sökning: "stable isotopes"

Visar resultat 21 - 25 av 146 avhandlingar innehållade orden stable isotopes.

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

   Författare :Kajsa Mellbrand; Peter Hambäck; Lena Kautsky; David Wise; Stockholms universitet; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

3. 22. Late Holocene spatiotemporal hydroclimatic variability over Fennoscandia inferred from tree-rings

   Författare :Kristina Seftigen; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Tree-rings; Fennoscandia; hydroclimate; SPEI; SPI; ring-width; maximum latewood density; stable isotopes; field reconstruction; point-by-point regression;

   Sammanfattning : There is a broad scientific consensus that the global climate is changing, and that human activity is a significant factor contributing to the change. The response of the hydrological cycle to the warming is far reaching, including increases in the intensification and frequency of extreme hydroclimatological events. LÄS MER

4. 23. Proterozoic to Quaternary Events of Fracture Mineralisation and Oxidation in SE Sweden

   Författare :Henrik Drake; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fracture minerals; low-temperature evolution; paleohydrogeology; redox front; wall rock alteration; stable isotopes; geochemistry; Ar-Ar dating; fluid inclusions; Mössbauer spectroscopy; U-series disequilibrium; Simpevarp; Laxemar; SE Sweden; nuclear waste repository.;

   Sammanfattning : Fracture minerals and altered wall rock have been analysed to reveal the low-temperature evolution, especially regarding redox conditions, of the Simpevarp area, SE Sweden. This area is one of the two areas in Sweden investigated by the Swedish Nuclear fuel and Waste Management Co. LÄS MER

5. 24. Nitrogen Cycling at Cold Climate Mine Sites in Northen Sweden

   Författare :Lino Nilsson; Anders Widerlund; Anders Lundqvist; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nitrogen; Mining; Cycling; nutrients; Isotopes; Nitrogen-model; modelling; numerical-modelling; Isotope-tracing; Tracing; Isotope; geochemistry; Applied Geology; Tillämpad geologi;

   Sammanfattning : High nitrogen discharge from mining sites has been an environmental issue that has been closely studied in the recent years. The environmental effects of high nitrogen discharge are mainly eutrophication, but can also lead to changed species composition and algae blooms. LÄS MER

7. 25. Eastern equatorial Pacific bulk sediment properties and paleoceanography since the late Neogene

   Författare :Daniele Reghellin; Helen K. Coxall; Jan Backman; Gerald R. Dickens; Steve Hovan; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Paleoceanography; late Neogene; eastern equatorial Pacific; deep sea sediments; bulk sediment; stable isotopes; surface mixed layer; sediment physical properties; Marine Geology; maringeologi;

   Sammanfattning : Reconstructing eastern equatorial Pacific (EEP) oceanography since the late Neogene (about 8 million years ago, Ma) is a central topic in current paleoceanographic investigations. The reason for this is two-fold. LÄS MER