Search for dissertations about: "Ediacaran"

Found 4 swedish dissertations containing the word Ediacaran.

  2. 1. The Ediacaran Diversification of Organic-walled Microbiota : Ocean Life 600 Million Years Ago

    Author : Sebastian Willman; Małgorzata Moczydłowska-Vidal; John Peel; Shuhai Xiao; Uppsala universitet; []
    Keywords : Earth sciences; acritarchs; Ediacaran; Australia; biostratigraphy; microfossils; Geovetenskap;

    Abstract : The only direct evidence of past life is provided by fossils. Fossils tell us about the evolution of life on Earth and they give us clues concerning ancient environments. The Ediacaran Period (roughly 635-542 million years ago) is characterised by the appearance and diversification of various microbiota and also the diversification of metazoans. READ MORE

  4. 2. Life in the Ediacaran - A study of organic walled microfossils from Australia

    Author : Sebastian Willman; Uppsala universitet; []
    Keywords : ;

    Abstract : .... READ MORE

  5. 3. Ocean chemistry and the evolution of multicellularity

    Author : Emma U. Hammarlund; Stefan Bengtson; Donald Canfield; Nils Holm; Graham Budd; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geochemistry; biology; paleontology; evolution; multicellularity; geokemi; Geochemistry;

    Abstract : Oxygen has been assumed to be a vital trigger for the evolution of multicellular life forms on Earth, partly based on its power to promote substantial energy flux in cell respiration and partly as biosynthesis of compounds like collagen require oxygen. However, the co-evolution of large life and the Earth’s chemical environment is not well understood at present, and there is particular disagreement in the field about whether the Cambrian explosion of animal life forms was a chemical or biological event. READ MORE

  6. 4. The Evolutionary Significance of Cambrian Ecdysozoan Trace Fossils

    Author : Giannis Kesidis; Graham Budd; Liam Herringshaw; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cambrian; trace fossil; Cruziana; Rusophycus; Treptichnus; Ecdysozoa;

    Abstract : The origin of most of the animal phyla is tied to the Cambrian explosion, a rapid diversification event that took place from about 540 million years ago. This diversification is coupled with a great number of concurrent metazoan body plan innovations such as the development of the coelom, antagonistic muscles and a through-gut. READ MORE