Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
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 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
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.