Quaternary environmental history of the Čejčské Lake (S. Moravia, Czech Republic)

Abstract

The whole territory of Bohemia and Moravia with only two exceptions was located in the periglacial region during the Quaternary glacial periods. These exceptions were the northernmost part of Bohemia and the mouth of the Moravian Gate through which the continental glacier in the past penetrated this country and left traces in the form of moraines and in Moravia also sediments in the oldest Czech lake, Stonava. On the basis of pollen analysis, the organic sediments recovered there were dated to the Holsteinian Interglacial (Mindel/Riss). Natural lakes are rare in the Czech Republic (Černé, Čertovo, Prášilské, Plešné, Laka, Stonava, Komořany, Chrást, Stará Boleslav, Polabské černavy, Soos, Měňany, Švarcenberk, and Velanská cesta), since most of its territory has never been glaciated. As indicated by new palynological research, this statement does not fully apply to southern Moravia, where a number of lakes existed in the past, e.g. the former lakes Vracov, Čejčské, Kobylské, Vacenovice and Vlkoš. The deposition of lake sediments occurred mainly in the Holocene. According to the present research on the Čejčské Lake, the vegetation assemblages consist of species with various ecological requirements. Due to favorable circumstances, this site has been put forward for protection and designated a Natural Monument.•

Could canopy forests survive agricultural colonization in the Polabi lowland (Czech Republic)

“…6), though the D5 layer generally conforms to the Subboreal based on pollen data. Similar sedimentation with a great admixture of re-deposited material was observed during the same period in lake sediments from southern Moravia (Břízová 2009). The biostratigraphical comparison with radiocarbon dating is shown in Tables 3 and 4.…”

Response of fluvial, aeolian, and lacustrine systems to late Pleistocene to Holocene climate change, Lower Moravian Basin, Czech Republic

“…Third, although the thinly bedded strata are over 20 m higher in elevation than the lacustrine beds of the Bzenec sand body, these strata could represent deposition within the upper reaches of the lake. However, tectonic uplift could account for elevation differences given that Holocene uplift of up to 8 mm/y and associated with Carpathian orogenic activity is documented for an area 20 km west of Bzenec (Břízová, 2009). Overall, it is possible that the upper unit represents a continuation of the lacustrine portion of the Bzenec sand body, but could alternately represent lacustrine facies developed distal of the alluvial fans.…”

Can people change the ecological rules that appear general across space?

“…Here, we examine temporal behaviour of spatial biodiversity patterns that might be considered rules or even laws. We do this by analysing fossil data on central European plant (Hahne, ; Stebich & Litt, ; Břízová, ; Kuneš et al ., ; Skrzypek et al ., ; Dudová et al ., ; Žák et al ., ) and land snail (Horáčková et al ., ) assemblages (Fig. , see Appendix S1 for details on the datasets) that cover the past 14,300 years.…”