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Bacterioplankton response to eutrophication in Lake Ladoga



Bacterioplankton response to eutrophication in Lake Ladoga



Hydrobiologia 322(1-3): 17-22



Bacterial processes in Lake Ladoga have been systematically investigated since 1976 by determinations of total number of bacteria, dark CO-2-fixation and rates of nitrification and bacterial respiration. In the period 1976-78, the microbiological observations showed evidence of eutrophication, e.g. bacterial densities reaching up to 3 times 10-6 cells ml-1, dark CO-2-fixation up to 11 mu-g C l-1 d-1 and bacterial respiration up to 0.7 mg O-2 l-1 d-1. From 1977 to 1981, the highest values were typically obtained in the south littoral zone, where high levels of nutrients were discharged from the Volkhov River. At this stage, the values observed in the open lake were typical for oligotrophic waters, and the high values in near-shore areas indicating mesotrophy. In the subsequent years, the highest summer values of bacterial numbers and dark CO-2-uptake have been generally observed in the offshore regions (up to 5 times 10-6 cells ml-1, and up to 21 mu-g C l-1 d-1, respectively), thus showing that the initial spatial heterogeneity has changed to a more homogeneous pattern. The same tendency is evident in phytoplankton. Rates of nitrification have been relatively low (up to 24.3 mu-g N l-1 d-1) and lacking definite spatial patterns.

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Accession: 008212146

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DOI: 10.1007/bf00031800


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