Sökning: "diversity patterns"

Visar resultat 26 - 30 av 338 avhandlingar innehållade orden diversity patterns.

1. 26. Genetics and ecology of natural populations

   Författare :Elisabeth Lundqvist; Ulf Lagercrantz; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Angelica archangelica; Bistorta vivipara; Viscaria alpina; Eiseniella tetraedra; ecotypes; hydrochory; genetic differentiation; clone diversity; genetic patterns; riparian;

   Sammanfattning : I have studied the genetic variation of single species using morphological variation and enzyme electrophoresis. I have striven to understand the interaction between the breeding structure and the ecology of the species in relation to the community, in which it lives. The work was done in the county of Västerbotten, northern Sweden. LÄS MER

3. 27. A typology of comparatives in Sinitic : grammaticalization, patterns and language contact

   Författare :Ansaldo Umberto; David Gil; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; General Linguistics; allmän språkvetenskap;

   Sammanfattning : This dissertation offers a window on the grammatical diversity of Chinese languages, hereafter referred to as Sinitic. It focuses in particular on comparative constructions of southern varieties such as Cantonese, Minnan and Hakka and compares these to northern Mandarin as well as some non- Sinitic languages of Southeast Asia. LÄS MER

4. 28. Evolution of Lycopodiaceae (Lycopsida) : Relationships and Patterns of Diversification

   Författare :Niklas Wikström; Anders Tehler; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; systematisk botanik; Systematic Botany;

   Sammanfattning : A series of phylogenetic analyses using nucleotide sequence data resolves many aspects of the relationships in a group of land plants that until now have received comparatively little attention, the homosporous lycopsids or Lycopodiaceae. Although the group has evolved as an isolated lineage ever since the Late Devonian (more than 470 Myr ago), little is known about how modern species diversity relate to this ancient history. LÄS MER

5. 29. The Nostoc Symbiont of Lichens : Diversity, Specificity and Cellular Modifications

   Författare :Per Paulsrud; Jack Meeks; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; fysiologisk botanik; Physiological Botany;

   Sammanfattning : Cyanobacteria belonging to the genus Nostoc have the capacity to form symbiotic associations with a wide range of organisms. Diversity, specificity and cellular modifications of the symbiosis between Nostoc and fungi in the formation of lichens were investigated in this thesis. LÄS MER

7. 30. Comparative morphological studies of fossil and living plane trees (Platanaceae) and oaks (Quercus): taxonomy, ecology, evolution

   Författare :Georg Florian Tschan; Thomas Denk; Ove Eriksson; Bertil Ståhl; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Platanaceae; Platanus; Credneria; Quercus; Galliferae; leaf architecture; epidermal anatomy; comparative morphology; character variation; variability; sample size; diversity patterns; species concepts; ecology; biogeography; evolution; plant fossils; Plant Ecology; växtekologi;

   Sammanfattning : Morphological characters are essential for flowering plant identification, but also provide information about diversity patterns and ecological adaptation. In woody plant species, characters of the leaf are among the most useful and can be examined on fossils as well. LÄS MER