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Comparative bacteriological investigation of three shallow Hungarian lakes with different trophic levels

Oláh, János and Vásárhelyi, Réka (1970) Comparative bacteriological investigation of three shallow Hungarian lakes with different trophic levels. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 37. pp. 223-234. ISSN 0365-3005

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Abstract

1. The quantity of both the saprophytes (527·10³/ml), and total bacterioplankton (3—8.8·10⁶/ml) in Inner Lake is in accordance with the data in literature referring to eutrophic lakes. However, the extremely low quantity of the bacterioplankton in the extensive and shallow Lake Balaton and Velence Lake does not reflect the real trophic state. 2. The considerable decrease of the quantity of the total bacterioplankton measured is not known in the mesotrophic and eutrophic lakes. This significant decrease in summer and late summer period is an important feature of our shallow extensive lakes. 3. The quantity of saprophytes and total bacterioplankton in the parts isolated with reeds in Velence Lake is different and it is in inverse ratio to the Secchi transparency. Thevalues of COD and Bringman’s Coli biomass test have little alteration. 4. We can state on the examination of the 8 reeds-open water sections that the quantity of saprophytes in the reeds is always greater than in the open water. The following periodic phenomena had been observed are characteristic to the reeds-open water sections in Lake Balaton: a) the highest amount of saprophytes is at the border of reeds-open water, b) the amount of the total bacterioplankton in the reeds can decrease toa lowvalue (1·10⁴/ml). 5. The vertical surveys show the possibility of the formation of the bacterioplankton stratification in our shallow lakes like Lake Balaton besides the heterogeneous vertical distribution.

Item Type: Article
Subjects: Q Science / természettudomány > QR Microbiology / mikrobiológia
Depositing User: Edina Fejős
Date Deposited: 02 Jun 2024 18:01
Last Modified: 02 Jun 2024 18:01
URI: https://real.mtak.hu/id/eprint/196337

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