Search for dissertations about: "Palaeontology"

Showing result 21 - 25 of 29 swedish dissertations containing the word Palaeontology.

  2. 21. Latest Miocene – Early Pliocene Paleoclimate and Phytoplankton Productivity

    Author : Boris-Theofanis Karatsolis; Jorijntje Henderiks; Luc Beaufort; Uppsala universitet; []
    Keywords : Late Miocene; early Pliocene; IODP; paleoclimate; basin evolution; phytoplankton; paleoproductivity; Milankovitch cycles; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : Paper IPre-Quaternary paleoclimate studies in Australia mainly focus on terrestrial records from the southeastern part of the continent. IODP Expedition 356 drilled on the northwestern Australian shelf, yielding Miocene-Pleistocene paleoclimate records in an area where climate archives are scarce. READ MORE

  4. 22. The Arthropod Assemblage of the Upper Devonian Strud locality and its Ecology

    Author : Linda Lagebro; Graham E. Budd; Gregory D. Edgecombe; John S. Peel; Gerhard Scholtz; Uppsala universitet; []
    Keywords : Branchiopoda; Hexapoda; Eurypterida; Strud; Famennian; ephemeral pool; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : The Devonian (419-359 million years ago) is the geological period when the terrestrial biota fully established. Early representatives from a terrestrial and continental aquatic biota have previously been reported from the Upper Devonian (Famennian) Strud quarry in Belgium, in the shape of seed-bearing plants and vertebrates (fish and early tetrapods). READ MORE

  5. 23. Early Cambrian Problematic Lophotrochozoans and Dilemmas of Scleritome Reconstructions

    Author : Cecilia M Larsson; Lars E Holmer; Christian B Skovsted; Anette E S Högström; John S Peel; Glenn A Brock; Michael J Vendrasco; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Problematica; scleritome; Trachyplax; tommotiid; Cambrian; South Australia; North Greenland; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : The emergence and radiation of metazoan body plans around the Precambrian/Cambrian boundary, some 500-600 million years ago, seems to be concordant with the appearance and diversification of preservable hard parts. Several Precambrian soft-bodied, multicellular organisms most likely represent stem-group bilaterians, but their fossil record is rather sparse. READ MORE

  6. 24. Single-cell RNA sequencing provides novel insights into spider development and represents an innovative alternative to study the evolution and development of panarthropods

    Author : Brenda Irene Medina-Jiménez; Ralf Janssen; Graham Budd; Angelika Stollewerk; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; panarthropod; spider embryo; single-cell RNA sequencing; EvoDevo; candidate gene approach; gene expression; cluster marker; Biology with specialization in Molecular Biology; Biologi med inriktning mot molekylärbiologi; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : Panarthropoda is a monophyletic group of invertebrate animals with a segmented body, paired appendages, dorsal brain, and ventral nerve cords. In order to study the mechanisms underpining their evolution, I study the genetic factors that drive their development. READ MORE

  7. 25. Three-dimensional Virtual Histology of Early Vertebrate Scales Revealed by Synchrotron X-ray Phase-contrast Microtomography

    Author : Qingming Qu; Per Ahlberg; Henning Blom; Moya Smith; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; 3D virtual paleohistology; scales; ontogeny; jawed vertebrates; phylogeny; Biology; Biologi; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : Vertebrate hard tissues first appeared in the dermal skeletons of early jawless vertebrates (ostracoderms) and were further modified in the earliest jawed vertebrates. Fortunately, histological information is usually preserved in these early vertebrate fossils and has thus been studied for more than a century, done so by examining thin sections, which provide general information about the specific features of vertebrate hard tissues in their earliest forms. READ MORE