Cyclotella-taxa (Bacillariophyceae) in lakes of the Alpine region and their relationship to environmental variables |
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| Authors: | Sybille Wunsam Roland Schmidt Rolf Klee |
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| Institution: | (1) Institute of Limnology, Austrian Academy of Sciences, Gaisberg 116, A-5310 Mondsee, Austria;(2) Bayerisches Landesamt für Wasserwirtschaft, Lazarettstrasse 67, D-80636 München, Germany |
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| Abstract: | Surface sediment diatom assemblages for 86 Alpine lakes were analysed focusing on the dominant genusCyclotella and corresponding environmental data. The range of morphological variability of theCyclotella bodanica/radiosa, C. distinguenda, C. ocellata, C. comensis andC. stelligera complexes was documented. Significance tests included in the canonical correspondence analysis (CCA) indicated that total phosphorus, conductivity and surface water temperature were significantly correlated withCyclotella taxa assemblage distribution. Numerical species optima and tolerances were calculated in respect to these significant variables using weighted averaging (WA) regression and calibration. CCA and WA were able to provide information about the environmental preferences of the various morphotypes observed. |
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| Keywords: | Cyclotella diatoms Alpine lakes ordination weighted averaging |
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