Sökning: "isotopes"

Visar resultat 11 - 15 av 308 avhandlingar innehållade ordet isotopes.

1. 11. Consuming and communicating identities : Dietary diversity and interaction in Middle Neolithic Sweden

   Författare :Elin Fornander; Kerstin Lidén; Per Andersson; Liv Nilsson Stutz; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Middle Neolithic; Neolithisation; Sweden; Baltic Sea; Funnel Beaker Culture; Pitted Ware Culture; Battle Axe Culture; megaliths; isotopes; δ13C; δ15N; δ34S; 87Sr 86Sr; radiocarbon dating; palaeodiet; mobility; interaction; identity; ethnicity; Archaeology; Arkeologi; Archaeological Science; laborativ arkeologi;

   Sammanfattning : Isotope analyses on human and faunal skeletal remains from different Swedish Neolithic archaeological contexts are here applied as a means to reconstruct dietary strategies and mobility patterns. The chronological emphasis is on the Middle Neolithic period, and radiocarbon dating constitutes another central focus. LÄS MER

3. 12. Ecosystem functioning in streams : Disentangling the roles of biodiversity, stoichiometry, and anthropogenic drivers

   Författare :André Frainer; Roland Jansson; Brendan McKie; Jonathan Benstead; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; detrital food web; functional diversity; stoichiometry; nitrogen and phosphorus concentrations; recalcitrant carbon; spatial and temporal species distribution; pools and riffles; isotopes; leaf decomposition rates; land use; restoration; habitat complexity;

   Sammanfattning : What will happen to ecosystems if species continue to go extinct at the high rates seen today? Although ecosystems are often threatened by a myriad of physical or chemical stressors, recent evidence has suggested that the loss of species may have impacts on the functions and services of ecosystems that equal or exceed other major environmental disturbances. The underlying causes that link species diversity to ecosystem functioning include species niche complementarity, facilitative interactions, or selection effects, which cause process rates to be enhanced in more diverse communities. LÄS MER

4. 13. Altiplanic aquifer exploration by multidisciplinary methods : Addressing the basis of sustainable use of groundwater

   Författare :Etzar Gomez Lopez; Teknisk geologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Groundwater; Geophysics; Isotopes; Aquifer; Hydrogeology;

   Sammanfattning : The sustainable use of groundwater relies on building up three stages: exploration, development and management. The exploration is crucial to understand the capabilities and limitations of aquifer units; e.g. LÄS MER

5. 14. The Vertical Distribution of Roots, Mycorrhizal Mycelia and Nutrient Acquisition in Mature Forest Trees

   Författare :Hans Göransson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; Växtekologi; isotopes; Root bioassay; Mixed stands; Picea abies; Fagus sylvatica; Nutrient uptake; Quercus robur; PLFA; Root distribution; Ectomycorrhiza;

   Sammanfattning : The vertical distribution of the nutrient uptake of Norway spruce (Picea abies (L.) Karst.), European beech (Fagus sylvatica L.) and pedunculate oak (Quercus robur L. LÄS MER

7. 15. 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