|
|
Holocene Succession of Mollusc Assemblages in the Southern Part of Kokořínsko Area
Oravec, Jan ; Juřičková, Lucie (advisor) ; Beran, Luboš (referee)
The sandstone rock cities of the Bohemian Cretaceous Basin are traditionally considered floristically and faunistically impoverished areas, because the environment of acidic quartz sandstones complicates the development of developed biocenoses. The unfavourable abiotic conditions are compensated for geomorphological diversity of the landscape, which creates a wide range of locations providing habitats for many biological species with different ecological requirements. However, the current appearance of the sandstone areas is due to the extensive transformation of the environment in the late Holocene, as evidenced by the rich subfossil communities of terrestrial gastropods. In the presented study, the succession of postglacial malacocenoses was processed from five sites in the southern part of the Kokořínsko area, demonstrating the continuous development of species-rich forest habitats during the early and middle Holocene. The presence of calcareous encrustations on the surface of acidic sandstone walls, which allowed the continuous occurrence of calciphilous mollusc species, is also documented from this wet period. The gradual transformation of the natural environment is related to the beginning of the late Holocene and was caused by the leaching of nutrients from the soil horizons and the...
|
|
|
The Finds of Mollusc Shells From the Lumbe Garden in Light of the Conchological Analysis
Oravec, Jan ; Říhová, Dagmar (advisor) ; Juřičková, Lucie (referee)
The submitted thesis focuses on the analysis of conchological finds from archaeological layers in the Lumbe Garden situated on the north forecourt of Prague Castle (Prague, Czech Republic). The collection of the conchological finds was discovered during archaeological research realized in the years 2018 and 2019. The first part of this text describes the historical development and the effect of the usage of conchological methods in archaeology, taking into account the results of some other research. The following description of the garden area formation helps to understand the fundamental features of this area, where the geological subsoil allowed the conservation of this large collection of malacological finds. The core of this study is the analysis of conchological material. Together with the description of used methods, all detected taxa of molluscs are identified and described. Four species of common freshwater and terrestrial gastropods, four taxa of routine freshwater bivalves and two genera of marine molluscs were identified. Further, their presence in archaeological layers is explained and discussed, with support of other conchological analysis. The limited number of the detected mollusc species contributed to the knowledge about the area under investigation where natural conditions...
|
guest ::
RSS feed.