Bacterial gradients at the sediment-water interface of shallow lakes

Oláh, János (1973) Bacterial gradients at the sediment-water interface of shallow lakes. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 40. pp. 219-225. ISSN 0365-3005

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Abstract

1. During the last forty years the number of aerobic heterotrophic bacteria on the sediment surface of Lake Balaton increased from a value of 1·10³ cell/g wet sediment to a value of 1·10⁵. During th e same period the quantity of the heterotrophic bacterioplankton showed no significant change. Most bacteria occurred in the upper 1 cm layer of the sediment. In the deeper sediment layers and in the water layers above the bottom their number decreased rapidly. 2. During the last thirty years the number of anaerobic bacteria on the sediment surface increased at least by one order of magnitude. In the bottom water layers there was no anaerobic bacteria. In the deeper, reduced sediment layers their number increased or decreased depending on the different media used. 3. The quantity of bacteria counted on the membrane filter increased from a value of 3·10⁸/g wet sediment (Lake Balaton) to a value of 1·10¹⁰ in lakes with different trophic levels.

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