||Early Eutrophication in the Lower Great Lakes: New Evidence from Biogenic Silica in Sediments.
Schelske, C. L. ;
Stoermer, E. F. ;
Conley, D. J. ;
Robbins, J. A. ;
Glover, R. M. ;
||Michigan Univ., Ann Arbor.;Environmental Research Lab.-Duluth, MN.
Water pollution ;
Great Lakes ;
Silicon dioxide ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
New evidence from studies of biogenic silica and diatoms in sediment cores indicates that eutrophication in the lower Great Lakes resulted from nutrient enrichment associated with early settlement and forest clearance. Diatom production peaked from 1820 to 1850 in Lake Ontario, at about 1880 in Lake Erie, but not until 1970 in Lake Michigan. This is the first reported sediment record of the silica-depletion sequence for the Great Lakes. (Copyright (c) American Association for the Advancement of Science 1983.)