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Regional and circadian oxygen determinations in lake balaton concerning the eutrophication of the lake

Regional and circadian oxygen determinations in lake balaton concerning the eutrophication of the lake

Annales Instituti Biologici (Tihany) Hungaricae Academiae Scientiarum 43: 69-82

The method to determine the productivity of different sections of Lake Balaton [Hungary] by O2 measurements is suitable in situ by semi-synchronic studies. The thermal stability of Lake Balaton was studied. Calm weather due to surface cooling at night changed the thermal stability conditions in summer-time in the shallow lake, causing vertical mixing of the whole water column. This process promotes a suitable O2 supply in the deeper water layers and is an important limnological factor in spite of its short duration. As soon as the thermal stability (S) surpasses by calm weather overday 0.1 mkg/m2, the vertical water movements are blocked and microstratification appears. This stratification can be only dissolved by wave action at a windspeed of 2-4 m/s. The thermal stability in open water was at night occasionally negative (-0.029 mkg/m2 was measured in July and -0.007 mkg/m2 in Aug.). During daytime calm weather the stability values increased gradually up to 0.5 mkg/m2 in a water column not deeper than 250 cm. The amount of dissolved O2 reached 10.8-16.0 mg/l in July at C. The corresponding values were in Aug. 8, 15.5 mg/l at C. Life effecting differences (microstratification) can develop within a few hours in shallow (2-3 m deep) calm water due to temperature and light conditions in huge water masses. The O2 saturation values were low in autumn 1975 indicating no alga invasions accompanied by fishkill in the winter 1975-76. The rate of O2 production decreased gradually from the Keszthely area till the line between Badacsonytomaj and Fonyod. From there-on even and relatively low values could be noticed up to the northeast end of the lake. There was no further expansion of the highly eutrophic lake section in 1975 as compared with previous years.

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