Notes to the use of Aulacoseira taxa in the palaeoecological reconstruction of the Bohemian forest lakes

Tichá, Anna and Buczkó, Krisztina and Houk, Václav (2017) Notes to the use of Aulacoseira taxa in the palaeoecological reconstruction of the Bohemian forest lakes. STUDIA BOTANICA HUNGARICA, 48 (2). pp. 173-188. ISSN 0301-7001

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Abstract

Aulacoseira taxa are the most abundant members of diatom assemblages in Prášilské Lake (Czech Republic) during the Holocene. These dominant diatom taxa were studied in freshwater lacustrine sediments in order to harmonize data for subsequent diatom-based palaeoecological reconstruction. Nine taxa were distinguished within the genus, six of them (A. alpigena, A. lacustris, A. laevissima, A. lirata, A. perglabra, A. valida) showed clear features for identification, the rest three taxa (A. nivalis, A. pfaffiana, A. aff. tenella) required deeper analysis. We decided to use taxa in species rank, A. nivalis (W. Smith) English et Potapova and A. pfaffiana (Reinsch) Krammer, in spite of their hardly odds and the earlier suggested merging. Morphology of A. aff. tenella was also discussed in detail. Despite all endeavours, to distinguish some specimens belonging to the A. distans species complex using light microscope is impossible and a classification into the aggregates is needed. We suggested counting the valve face views and the valve mantle views separately, in order to repair subsequent potential misidentifications more simply.

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