| Abstract [eng] |
The thesis designed for the reconstruction of natural evironment history during the Lateglacial and Holocene according to the results of multiproxy investigations. PhD thesis is based on plant macrofossil records and geochronological data. Interpretation of data, have been performed in comparison with results of pollen, loss-on ignition, isotope (δ18O, δ13C). Seven sites were chosen for the investigations: Briaunis, Verpstinis, Pakampis, Pakastuva Lakes, Lavariškės Bog and two outcrops of the Ūla River. Reconstruction of the distribution of vegetation cover in a particular area, immigration of distinct plant species, and identification of a variety of plant species are discussed on the basis of the obtained data. Investigation results helped to characterise the water basins, including sedimentation conditions in palaeolakes and water level changes, and their evolution as well. The stages of vegetation development were distinguished and contemporized with major postglacial climatic events. The plant palaeocommunities outlined in the cross-sections provide basic information on dominating plant types and evolution of palaeo-communities during the distinct Lateglacial and Holocene periods. The Ellenberg system of the evaluation of modern environmental conditions was used and conformed for the evaluation of palaeoenvironmental conditions and the reconstruction of ecological conditions of plant habitats during the Lateglacial and Holocene. The thesis comprises 182 pages, 22 figures, 35 tables and 10 appendices. |
