Development and collapse of an Oscillatoria bloom in Loch Leven during July 1994

Armstrong, Janet A. and Fozzard, Ian R. and Sargent, Robert J. (1994) Development and collapse of an Oscillatoria bloom in Loch Leven during July 1994. Freshwater Forum, 4(3), pp. 203-210.

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Abstract

During 1994, weekly spot-sampling of open water sites on Loch Leven took place from 16th March onwards. Very little difference between spot-sampling sites was observed from 16th March to 5th July. Throughout April and May there was a slow increase in levels of chlorophyll-a, followed by a rapid increase through June, reaching a maximum of 230 micrograms per litre. On 8th July there was a very rapid rise in water temperature, with a corresponding increase in dissolved oxygen and pH. At 0915 hours on 9th July there was a drop in all three variables. These changes were coincident with a marked reduction in chlorophyll-a values falling to 70 micrograms per litre on 12th July. On 16th July evidence of a resurgence of photosynthesis was observed.

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