Jahreszeitliche Verteilungsmuster heterotropher Bakterien,bakterieller Fäkalindikatoren und der gelösten organischen Substanz im Bodensee (Obersee und Überlinger See) |
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| Authors: | Dr W Reichardt |
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| Institution: | 1. Limnologisches Institut der Universit?t Freiburg in Konstanz, Freiburg, Deutschland
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| Abstract: | Concomitant with the increased eutrophication observed during the last 20 years in Lake of Constance, also an increase of saprobity was expected. To prove this, viable counts of zymogenic heterotrophic bacteria (TVC) as well as of fecal indicators were determined in vertical profiles during the cycle of a year and compared with concomitant concentrations of dissolved organic matter (DOM). There was an inverse relationship between DOM and epilimnetic peaks of TVC, but also between DOM and viable counts of Cytophagaceae, which were most abundant at low water temperatures. The average epilimnetic TVC-values exceeded comparable 20 years old data by a factor of 10. On the other hand, fecal Coli and Streptococci, by accumulating in the bottom water, showed mostly a distribution which was reverse to earlier findings of this group and recent distribution patterns of TVC as well. Altogether, the results support the view that the abundance of zymogenic bacteria in Lake of Constance is mainly controlled by its epilimnetic primary production of degradable organic matter. |
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