Interannual variability of phytoplankton productivity and related parameters in Lake Constance: no response to decreased phosphorus loading?

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Abstract
In meso-eutrophic Lake Constance (Germany-Austria-Switzerland), phytoplankton bioraass, pigments and water transparency, as well as primary productivity, have been followed between 1980 and 1989. During this period, municipal phosphorus loading declined significantly. Since 1981, soluble reactive phosphorus (SRP) concentrations during deep lake mixing have decreased from ∼3.0 to currently 1 6 mmol m−3 at a rate of 7% year−1. Nitrate concentrations, by contrast, continued to rise. During the period of maximum phosphorus loading, flushing through the outlet and sedimentation were about equally important sinks of phosphorus from the euphotic zone. Recently, however, sedimentation and subsequent burial of P in the bottom deposits contributed about three-quarters to the overall P-losses from the system Main reasons for this shift are unchanged settling fluxes of phosphorus out of the euphotic zone and decreasing concentrations of total phosphorus in the water.

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