ALBERT

Note: Dissertation, Universität Potsdam, 2008 , Table of contents Kurzfassung Abstract Chapter 1: Introduction 1.1 Scientific background 1.1.1 Arctic environmental dynamics 1.1.2 Freshwater ostracods and their use in palaeoenvironmental studies 1.1.3 Permafrost and periglacial environment 1.2 Aims and approaches 1.3 Study region 1.3.1 Study sites 1.3.2 Geological characteristics 1.3.3 Climate 1.3.4 Periglacial freshwaters 1.4 Synopsis Chapter 2: Arctic freshwater ostracods from modern periglacial environments in the Lena River Delta (Siberian Arctic, Russia): geochemical applications for palaeoenvironmental reconstructions 2.1 Abstract 2.2 Introduction 2.3 Study area and types of water bodies 2.4 Materials and methods 2.5 Results 2.5.1 Physico-chemical characteristics of the ostracod habitats 2.5.2 Ostracod taxonomy and environmental ranges of their habitats 2.5.3 Ostracod geochemistry 2.6 Discussion 2.6.1 Taxonomy and ecology of ostracods 2.6.2 Element ratios in ostracods and ambient waters 2.6.3 Stable isotopes in ostracods and ambient waters 2.7 Conclusions Chapter 3: Evaporation effects as reflected in freshwaters and ostracod calcite from modern environments in Central and Northeast Yakutia (East Siberia, Russia) 3.1 Abstract 3.2 Introduction 3.3 Study area 3.4 Material and methods 3.4.1 Field work 3.4.2 Water analyses 3.4.3 Ostracod analyses 3.5 Results 3.5.1 Physico-chemical characteristics of the lakes and ponds 3.5.2 Ostracod taxonomy and environmental ranges 3.5.3 Stable isotopes in host waters and ostracod calcite 3.5.4 Element ratios in host waters and ostracod calcite 3.6 Discussion 3.6.1 Physico-chemical characteristics of the lakes and ponds 3.6.2 Ostracod taxonomy, biogeography, and environmental ranges 3.6.3 Stable isotopes in ostracod calcite 3.6.4 Element ratios in ostracod calcite 3.7 Conclusions Chapter 4: Eemian and Late Glacial/Holocene palaeoenvironmental records from permafrost sequences at the Dimitri Laptev Strait (NE Siberia, Russia) 4.1 Abstract 4.2 Introduction 4.3 Regional setting 4.4 Material and methods 4.4.1 Field methods and cryolithology 4.4.2 Geochronology 4.4.3 Sedimentology and stable isotopes 4.4.4 Palaeoecological proxies 4.5 Results 4.5.1 Geochronology, lithostratigraphy, sedimentology, and cryolithology 4.5.1.1 Eemian sequences 4.4.1.2 Late Glacial/Holocene sequences 4.5.2 Stable isotope ground ice records 4.5.3 Pollen studies 4.5.3.1 Eemian sequences 4.5.3.2 Late Glacial/Holocene sequences 4.5.4 Ostracod studies 4.5.4.1 Eemian sequences 4.5.4.2 Late Glacial/Holocene sequences 4.6 Discussion and Interpretation 4.6.1 Local palaeoenvironmental changes during the Eemian 4.6.2 Local palaeoenvironmental changes during the Late Glacial/Holocene 4.6.3 Palaeoenvironmental interpretation of ostracod calcite δ18O data 4.7 Conclusions Chapter 5: Synthesis 5.1 Taxonomy and ecology of ostracods 5.2 Geochemistry of ostracods 5.3 Indicator potential of freshwater ostracods in late Quaternary permafrost deposits 5.4 Outlook Appendix I: Freshwater ostracodes in Quaternary permafrost deposits in the Siberian Arctic I.1 Abstract I.2 Introduction I.3 Study area and geological background I.4 Materials and methods I.5 Results and interpretations I.5.1 Ostracode zone I I.5.2 Ostracode zone II I.5.3 Ostracode zone III I.5.4 Ostracode zone IV I.5.5 Ostracode zone V I.5.6 Ostracode zone VI I.6 Conclusions 125 Appendix II: Palaeoenvironmental dynamics inferred from late Quaternary permafrost deposits on Kurungnakh Island, Lena Delta, Northeast Siberia, Russia II.1 Abstract II.2 Introduction II.3 Regional setting II.4 Material and methods II.4.1 Sedimentology and cryolithology II.4.2 Geochronology II.4.3 Stable isotopes II.3.4 Palaeoecological proxies II.5 Results II.5.1 Lithostratigraphy, sedimentology, and cryolithology II.5.1.1 Unit I II.5.1.2 Unit II II.5.1.3 Unit III II.5.1.4 Unit IV II.5.1.5 Unit V II.5.2 Geochronology II.5.3 Oxygen and hydrogen stable isotopes of ground ice II.5.4 Palynological studies II.5.5 Plant macrofossils II.5.6 Ostracod remains II.5.7 Insect remains II.5.8 Mammal remains II.6 Discussion II.6.1 Local stratigraphic and palaeoenvironmental interpretation II.6.2 Beringian palaeoenvironmental context II.7 Conclusions Supplementary data A Supplementary data B Supplementary data C Appendix III: Data tables from Chapters 2 and 3 Appendix IV: References Acknowledgements

Note: Dissertation, Universität Potsdam, 2006