Diatom distribution and diatom inferred pH in the sediment of four alpine lakes |
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Authors: | Klaus Arzet Christian Steinberg Roland Psenner Norbert Schulz |
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Institution: | (1) Bayerisches Landesamt f. Wasserwirtschaft, Lazarettstr. 67, 8000 München 19, FRG;(2) Dept. Limnology, University Innsbruck, Technikerstr. 13, 6020 Innsbruck, Austria;(3) Kärntner Institut f. Seenforschung, Flatschacherstr. 70, 9010 Klagenfurt, Austria |
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Abstract: | The diatom distribution in the sediment of four alpine lakes in the central alpine area (Ötztaler Alpen, Tyrolia, and Mölltal, Carinthia) has been analysed in order to assess possible influences of atmospheric pollutants on remote lakes. The lakes are located more than 2000 m above sea level on poorly buffered bedrock (granite, gneiss and mica schist) and are therefore susceptible to acidification by acid deposition. The pH history of the lakes has been calculated by using Index B from Renberg & Hellberg (1982), which has been adjusted to central European conditions and applied in this region for the first time. The results indicate that there have been no pH decreases in three of the lakes, while in one lake diatom composition and distribution change significantly towards the sediment surface. But taxonomical problems and difficulties in the pH classification of the rarely found diatoms complicate the interpretation of the results. Important taxa will be discussed in view of their ecological significance. |
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Keywords: | diatoms sediment lake acidification high altitude lakes Melosira species |
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