Twelve species of submerged macrophytes occur now in Loch Leven as compared with twenty-three in 1910. Only four are common: Chara aspera, Nitella opaca, Potamogeton filiformis and Zannichellia palustris. The more recently recorded algae and macrophytes such as Cladophora sp., Enteromorpha sp., Potamogeton filiformis and Zannichellia palustris all indicate cultural enrichment. During the summer months of 1972 and 1973 there were high phytoplankton densities, mainly composed of Anabaena sp., developing apparently as a result of concentrations of phosphate-P greater than 0.05 mg 1-1, and these were correlated with reduced biomass values for the dominant submerged macrophyte Potamogeton filiformis. In the summer of 1974 there were low levels of phosphate-P and chlorophyll a in the water and P. filiformis grew well. There is some evidence that the inhibitory effect of algal blooms may operate through an attenuation of irradiance and an increase in pH.
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