A siliceous chrysophycean cyst-based pH transfer function for Central European lakes |
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| Authors: | Eva Facher Roland Schmidt |
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| Institution: | (1) Institute of Limnology, Austrian Academy of Science, Gaisberg 116, A-5310 Mondsee, Austria;(2) Present address: Institut für Systematische Botanik der Ludwig Maximilians, Universität München, Menzinger Str. 67, 80638 München, Germany |
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| Abstract: | The surface sediments of 50 Central European low to high mountain, acid-sensitive lakes were examined for chrysophycean stomatocysts. One hundred and twenty sic siliceous stomatocyst morphotypes were differentiated by using scanning electron microscope (SEM), counted and illustrated (light microscopy and SEM). Canonical Correspondence Analysis (CCA) showed that pH is the most important measured variable in explaining the cyst distributions, with a strong correlation to the first axis (r2=-0.78). Simple Weighted Averaging (WA) regression and calibration was performed to generate a transfer function for lake water pH. Finally, the transfer function was evaluated by reconstructing pH for a short annually laminated and 137Cs dated core from Lake Ple né, a strongly acid lake, in the Bohemian Forest. A comparison of the measured and inferred pH values indicates that the model has good predictive power. The cyst-inferred pH and the diatom-inferred pH both indicate that pH was low during the 1970s and that the lake has experienced recovery in recent years. |
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| Keywords: | siliceous cysts Chrysophyceae pH lake acidification ordination calibration |
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