Multivariate analysis of the 40 year Project Quinte biogeochemistry dataset : water chemistry, physical characteristics, seston and climate / by W.J.S. Currie and M.M. Frank. : Fs97-6/3125E-PDF

This report documents 40 years of biogeochemical data collected for Project Quinte. Since the 1970s, the Bay of Quinte (BoQ) has been listed as impaired due to eutrophication, though phosphorus controls and ecosystem changes have resulted in increased clarity (Secchi disc depth and light attenuation). In 1995, the Bay of Quinte shifted from a turbid to clear-phase state and currently macrophyte density remains high. Total phosphorus and nitrogen concentrations have declined, though soluble phosphorus levels remain high. Co-limitation by nitrogen in the BoQ is suggested by high correlations between TKN and seston. Summer chlorophyll values declined more than during the spring. Sodium, chloride and conductivity levels increased within the Bay of Quinte, possibly sourced from urban de-icing operations. Very cold winters of 1977-1978 and 1994 may have resulted in reduced system productivity while recent increased temperatures and precipitation variability post-1999 have changed the timing of nutrient peaks to earlier in the year.

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