Search for dissertations about: "palaeoecology"

Showing result 11 - 15 of 24 swedish dissertations containing the word palaeoecology.

  2. 11. Jurassic and Early Cretaceous selachians - focus on southern Scandinavia

    Author : Jan Rees; Berggrundsgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geology; Paleontologi; Palaeontology; Lissodus; palaeoecology; England; Denmark; Sweden; sharks; selachians; Jurassic; Early Cretaceous; physical geography; Geologi; fysisk geografi;

    Abstract : The Jurassic and Early Cretaceous selachian faunas of Scania (Skåne), southern Sweden and the island of Bornholm (Denmark) have been investigated. Three Early Jurassic shark tooth assemblages have been recorded and investigated, one from Hettangian strata and the other two from Pliensbachian sediments. READ MORE

  4. 12. Past environmental and climate changes in northern Tanzania : Vegetation and lake level variability in Empakaai Crater

    Author : Maria Ryner; Karin Holmgren; Peter Kuhry; Lars-Ove Westerberg; Henry Lamb; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; palaeoecology; palaeolimnology; physical and societal factors; Holocene; Tanzania; Lake Emakat; Engaruka; Earth sciences; Geovetenskap; Physical Geography; geografi med naturgeografisk inriktning;

    Abstract : This thesis presents palaeoenvironmental data from equatorial Africa covering two important time intervals; i) the warming period forming the Pleistocene/Holocene transition and ii) the last millennium. The Empakaai Crater, in northern Tanzania contains a lake from where sediment cores, spanning two time-slices 14.8-9. READ MORE

  5. 13. Palaeoenvironmental changes in the northern boreal zone of Finland: local versus regional drivers

    Author : Shyhrete Shala; Karin H. Helmens; Christian Bigler; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Palaeolimnology; Palaeoecology; Biological assemblages; Sediment geochemistry; Regional drivers; Local drivers; Quantitative temperature reconstructions; Transfer-functions; Holocene; MIS 5d-c; Northern boreal zone; NE Finland; kvartärgeologi; Quaternary Geology;

    Abstract : Multiple proxies derived from the Lake Loitsana sediment sequence (NE Finland) are employed to determine the timing of deglaciation, characterise an early Holocene proglacial lake stage and reconstruct Holocene lake development. Local-scale processes causing shifts in biological assemblages are identified and the most likely Holocene mean July air temperature (Tjul) development is assessed. READ MORE

  6. 14. Palaeoenvironmental reconstructions from modern and ancient plant DNA

    Author : Kevin Nota; Laura Parducci; Love Dalén; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular palaeoecology; Ancient lake sediments; Post-glacial migration; Floral changes; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Abstract : Palaeoecological studies on lake sediments and peat archives have provided fundamental knowledge about past environments, nevertheless, a lot remains to be learned. In this thesis, I focussed on plant ancient DNA extracted from sedimentary archives (sedaDNA), in combination with DNA from living trees with the aims of: (1) investigating different extraction methods and levels of inhibition in sediments, (2) investigating postglacial recolonisation history of Norway spruce in Fennoscandia, (3) comparing different sequencing and bioinformatic approaches to investigate past flora changes using sedaDNA and investigating past flora change in contrasting environments (southern Italy versus southern Sweden), and (4) communicating my work more broadly using art. READ MORE

  7. 15. Deposition, palaeoecology and diagenesis of the Silurian reef-like limestones on Gotland

    Author : Akihiro Kano; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Several Silurian (Wenlockian-Ludlovian) reef-like limestones on Gotland wereselected for studies of depositional, palaeoecological, and diagenetic conditions. Thereef-like limestones were deposited on a warm, shallow and open marine shelf. READ MORE