Record Display for the EPA National Library Catalog


Main Title Phosphorus Enrichment, Silica Utilization, and Biogeochemical Silica Depletion in the Great Lakes.
Author Schelske, C. L. ; Stoermer, E. F. ; Fahnenstiel, G. L. ; Haibach, M. ;
CORP Author Michigan Univ., Ann Arbor. Great Lakes Research Div.;Environmental Research Lab.-Duluth, MN.;National Science Foundation, Washington, DC.
Publisher c1986
Year Published 1986
Report Number EPA-R-806294 ;NSF-OCE82-16588; EPA/600/J-86/522;
Stock Number PB90-142936
Additional Subjects Phosphorus ; Great Lakes ; Silicon dioxide ; Diatoms ; Bioassay ; Geochemistry ; Biochemistry ; Lake Erie ; Lake Ontario ; Inorganic phosphates ; Dissolution ; Concentration(Composition) ; Sedimentation ; Thermal stratification ; Recycling
Library Call Number Additional Info Location Last
NTIS  PB90-142936 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
The hypothesis that silica (Si) depletion in Lake Michigan and the severe Si depletion that characterizes the lower Great Lakes were induced by increased phosphorus (P) inputs was supported by bioassay experiments showing increased Si uptake by diatoms with relatively small P enrichments. The authors propose that severe Si depletion (Si concentrations being reduced to less than 0.39 mg SiO L prior to thermal stratification) results when P levels are increased to the extent that increased diatom production reduces Si concentrations to limiting levels during the thermally mixed period. The model proposed for biogeochemical Si depletion is consistent with previous findings of high rates of internal recycling because, under steady-state conditions for Si inputs, any increase in diatom production will produce an increase in permanent sedimentation of biogenic Si provided some fraction of the increased biogenic Si production is not recycled or unless there is a compensating increase in dissolution of diatoms.