Molluscs in the upper part of the Zákolanský floodplain sediments in the Otvovice village near the Kralupy nad Vltavou town

Geoscience Research Reports 42, 2009 (GRR for 2008), pages 62–65

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Abstract

This paper describes a rich subfossil molluscan fauna from upper layers of the Zäkolansky stream flood plain sediments. Despite the fact that the locality itself and its environs have been settled and intensively cultivated by humans since primeval times, drilling core has yielded 56! mollusc species in total. Two aquatic species - Valvata cf. macrostoma Mörch and Pisidium tenuilineatum Stelfox are listed in the Red book of endangered and rare animal species of the Czech Republic. In accordance with the calcareous deposit character – including local predominance of sandy tufa proportion - aquatic, palustrine, euryoecious and open-country species were dominant in the assemblages in 11 samples taken in individual horizons in descending order. On the other hand, species living in forests, perennially wet forests, groves, and steppes occurred in the thanatocoenose, but only very rarely. They were transported as allochthonous elements into the alluvial plain from the adjacent slopes. Due to the omnipresence of the species Cecilioides acicula (Müll.) the age of the studied drilling core is undoubtedly Upper Holocene.