Sökning: "vegetation analysis"

Visar resultat 16 - 20 av 143 avhandlingar innehållade orden vegetation analysis.

1. 16. Cerebral complications in infective endocarditis

   Författare :Ulrika Snygg-Martin; Göteborgs universitet; []
   Nyckelord :infective endocarditis IE ; cerebral embolism; cerebrovascular complications; antiplatelet therapy; anticoagulation; warfarin; vegetation; Staphylococcus aureus; mortality;

   Sammanfattning : Infective endocarditis (IE) is a life-threatening disease. Cerebral embolization complicates the course in 10-40% of IE episodes. Aims of study were to investigate the frequency of cerebrovascular complications (CVC) in left-sided IE and the influence of protective and risk factors with focus on antiplatelet and anticoagulant therapy. LÄS MER

3. 17. Holocene climate and environmental dynamics on the Tristan da Cunha island group, South Atlantic

   Författare :Karl Ljung; Kvartärgeologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; palynologi; Geology; climate change; pollen analysis; Palaeobotany; phylogeny; palynology; Paleobotanik; fylogeni; vegetation change; gyttja; peat; Holocene; Quaternary; South Atlantic; Tristan da Cunha; physical geography; Geologi; fysisk geografi;

   Sammanfattning : It has been shown that the present interglacial has been climatically dynamic with both rapid and severe climatic fluctuations. The spatial and temporal differences of these changes are however not fully resolved. The aim of this thesis is to present a detail high resolution record of past climate changes from the central South Atlantic. LÄS MER

4. 18. Global Changes and European Terrestrial Ecosystems

   Författare :Emmanuel Gritti; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; European species; Climatic risk; pedology; cartography; climatology; Fysisk geografi; geomorphology; Physical geography; Vegetation modelling; Pollen analysis; Plant invasion; geomorfologi; marklära; kartografi; klimatologi; Global Changes;

   Sammanfattning : Global environmental changes are topics of important societal concern and current scientific interest. These changes are driven by many different forcing and feedbacks occurring at various time and geographic scales and are largely influencing the various Earth systems. LÄS MER

5. 19. Multitemporal analysis of satellite data for vegetation mapping in Sweden

   Författare :Laine Boresjö Bronge; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : .... LÄS MER

7. 20. Systematics, phylogeography and polyploid evolution in the Dactylorhiza maculata complex (Orchidaceae)

   Författare :David Ståhlberg; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ITS; morphometry; taxonomy; Systematic botany; Växtekologi; Plant ecology; vegetation analysis; recombination; polyploidy; plastid DNA; niche differentiation; chemotaxonomy. Physiology of nonvascular plants; morphology; phytogeography; hybrid zone; glacial refugia; Dactylorhiza; flow cytometry; Systematisk botanik; taxonomi; morfologi; kemotaxonomi. Växters fysiologi inte kärlväxter .;

   Sammanfattning : The aim of this thesis was to investigate and describe different aspects of variation in the Dactylorhiza maculata complex and to relate the variation patterns to underlying biological processes such as Quaternary migration history, hybridization and polyploid evolution. The variation patterns were analysed at various geographic levels using molecular markers (plastid DNA and ITS of nrDNA), cytological data, morphometry and ecological data. LÄS MER