Sökning: "Systematic Zoology"

Visar resultat 21 - 25 av 45 avhandlingar innehållade orden Systematic Zoology.

1. 21. Babblers, Biogeography and Bayesian Reasoning

   Författare :Magnus Gelang; Per Ericson; Per Alström; Isabel Sanmartín Bastida; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Africa; Asia; Bayesian inference; biogeography; Cettidae; dispersal; extinction; Middle East; persistence; Sylvioidea; Sylviidae; Timaliidae; vicariance; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Sammanfattning : In this thesis, I try to proceed one step further towards an understanding of the biogeographic processes forming the distribution patterns of organisms that we see today. Babblers and warblers are diverse groups of passerines that are phylogenetically intermixed with other groups in the superfamily Sylvioidea. LÄS MER

3. 22. Tubificids with trifid chaetae: morphology and phylogeny of Heterodrilus (Clitellata, Annelida)

   Författare :Erica Sjölin; Christer Erséus; Lena Gustavsson; Mari Källersjö; Katrine Worsaae; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Heterodrilus; phylogeny; morphology; Tubificidae; Systematics and phylogenetics; Systematik och fylogeni; Systematic Zoology; systematisk zoologi;

   Sammanfattning : Heterodrilus is a marine group of small (3-25 mm) clitellates that occur interstitially in sandy sediments from the intertidal zone down to about 150 m depths. The taxon includes 42 valid species and has been recorded from localities in the Mediterranean Sea, the North-west Atlantic Ocean (including the Caribbean), the Galapagos Islands, and the Indo-Pacific Region. LÄS MER

4. 23. The Dawn of a New Age : Interrelationships of Acoela and Nemertodermatida and the Early Evolution of Bilateria

   Författare :Andreas Wallberg; Ulf Jondelius; Mikael Thollesson; Graham Budd; Gonzalo Giribet; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Acoela; Nemertodermatida; Bilateria; Metazoa; evolution; phylogenetic inferrence; ancestral reconstruction; taxon sampling; microRNA; Systematics and phylogenetics; Systematik och fylogeni; systematisk zoologi; Systematic Zoology;

   Sammanfattning : Deciphering the rapid emergence of bilaterian animals around the time of the Cambrian Explosion and reconstructing the interrelationships of animal groups have long been two of the most elusive problems in Zoology. This thesis concerns the phylogenetic interrelationships within and among Acoela and Nemertodermatida, two groups of small worms that are believed to be basal bilaterians and which may provide important clues for understanding the early evolution of animals. LÄS MER

5. 24. Palaeogenomic reconstruction of woolly mammoth evolutionary history and extinction dynamics

   Författare :Marianne Dehasque; Love Dalén; David Díez-del-Molino; Rike Stelkens; Rebecca N. Johnson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; woolly mammoth; Mammuthus primigenius; extinction; Wrangel Island; ancient DNA; palaeogenomics; radiocarbon dating; structural variants; genome erosion; population structure; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Sammanfattning : Biodiversity is declining globally. Yet, the biological and genetic processes associated with these declines on a longer timescale are still poorly understood. Ancient DNA is a powerful tool to study evolution in real-time. Despite advances in the field, there is further need for refinement of laboratory and computational techniques. LÄS MER

7. 25. Platsens blick : Vetenskapsakademien och den naturalhistoriska resan 1790-1840

   Författare :Pär Eliasson; Umeå universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; travel; apodemics; natural history; Royal Swedish Academy of Science; Swedish Museum of Natural History; plant geography; zoology; Linnaeus; Göran Wahlenberg;

   Sammanfattning : The purpose of the present dissertation is to study the relationship between travel as a form of knowledge and the natural history pursued at the Royal Academy of Science during the period 1790-1840. Primarily, this dissertation deals with the perception of travel as a form of knowledge which existed at the Royal Swedish Academy of Science, though a number of selected journeys are used to illustrate the era's shifting perceptions on travel. LÄS MER