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Distribution and morphological variability of Cyclotella-taxa in the late glacial of Längsee (Austria)

Langsee is a small meromictic lake (Loffler 1973) situated in the Carinthian lowland in Austria at an altitude of 548 m a.s.l. We have selected Langsee and the time interval of the LatePleniglacial and the older Late-Glacial (summarized here as “late glacial”), which approximately covers the time from 20 000 to 13 000 years before present, for several reasons: Since the lake is situated south of the Alps close to the end-moraines of the last ice age, fossil-bearing sediments date back to the time of deglaciation. Schmidt et al. (1998) described a warm period from Langsee, with an upper boundary of about 15 000 C years, which was called “Langsee oscillation” (Schmidt et al. 2001). Data about this interstadial are, however, scarce in the Alps. Since future scenarios predict the disappearance of glaciers in the Alps during present global warming, studies of the development of pro-glacial lakes are of interest. In the present study we focus on the stratigraphic distribution and morphological variability of selected Cyclotella-taxa (C. comensis Grunow, C. ocellata Pant., and C. distinguenda Hust.) in comparison with related taxa.