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Main Title Retrospective Analysis of the Response of Saginaw Bay, Lake Huron, to Reductions in Phosphorus Loadings.
Author Bierman, Jr., V. J. ; Dolan, D. M. ; Kasprzyk, R. ; Clark, J. L. ;
CORP Author Environmental Research Lab.-Duluth, Grosse Ile, MI. Large Lakes Research Station. ;International Joint Commission, Windsor (Ontario).;Environmental Research Lab., Narragansett, RI.
Year Published 1983
Report Number EPA-600/J-84-001;
Stock Number PB84-170943
Additional Subjects Phosphorus ; Water pollution ; Saginaw Bay ; Lake Huron ; Concentration(Composition) ; Seasonal variations ; Chlorophylls ; Sediments ; Lake waves ; Wind(Meteorology) ; Biomass ; Odors ; Phytoplankton ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB84-170943 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
A retrospective analysis was conducted of the response of Saginaw Bay, Lake Huron, to a substantial reduction in external phosphorus loadings over the study period 1974-1980. Loadings to Saginaw Bay from the Saginaw River for total phosphorus and dissolved ortho phosphorus were 55% and 72% lower, respectively, in 1980 than in 1974. In the most seriously degraded area of the bay, spring and fall total phosphorus concentrations decreased by 1% and 14%, respectively, while chlorophyll a concentrations decreased by 53% and 61% in the same seasons. The corresponding decreases for inverse Secchi depth were 0% and 17%. Sediment resuspension due to wind-induced wave action was the probable cause for the anomalous relationship between chlorophyll a and total phosphorus concentrations, and the lack of response of inverse Secchi depth. A substantial decrease in threshold odor observed in the municipal water supply during the study period was correlated with a decrease in blue-green dry weight biomass concentration.