Thecamoebians from recent lake sediments from the Šumava Mts, Czech Republic.

 

Authors: Lorencová M

Published in: Bulletin of Geosciences, volume 84, issue 2; pages: 359 - 376; Received 19 March 2008; Accepted in revised form 26 January 2009; Online 12 May 2009

Keywords: testate amoebae, thecamoebians, actuoecology, statistical analysis, Šumava Mts.,

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Abstract

Assemblages of thecamoebians (testate amoebae) were studied in forty-six surface samples of recent bottom sediments from five lakes in the Šumava Mts, Czech Republic. Altogether, twelve species of thecamoebians with anorganic wall were identified. The most abundant species, contained in 96% of samples, was Difflugia globulus. Other common species were Difflugia oblonga and Centropyxis orbicularis. Using cluster analysis it was possible to distinguish three main thecamoebian assemblages. The Difflugia globulus assemblage (66-100% of D. globulus) dominates in Plešné Lake, characterized by a higher phytoplankton content. The Difflugia globulus diversified cluster (4-64% of Difflugia globulus, 3-8 species in total) has the greatest species diversity and dominates in Laka Lake, characterized by the lowest phytoplankton biomass. The transitional Difflugia globulus and Pontigulasia compressa cluster (55-78% of Difflugia globulus, 12-32% of Pontigulasia compressa) occurs in lakes with medium values of phytoplankton biomass (Černé, Čertovo, Prášilské lakes). All the species found should be adaptable to low pH (< 6) because of the long term acidity of the investigated lakes. The species Difflugia globulus, Difflugia oblonga and Centropyxis orbicularis are characteristic for these lakes. The invariable morphology of Centropyxis orbicularis simplifies its identification and makes this species a good candidate as a palaeoenvironmental indicator. A comparison of recently evidenced taxa with the data from Černé Lake and Čertovo Lake published by Frič & Vávra (1898) was also made. Six new species have been found in these lakes ( Euglypha acanthopora, Centropyxis orbicularis, Centropyxis constricta, Difflugia viscidula, Nebela vitraea, Pontigulasia compressa).

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