Record Display for the EPA National Library CatalogRECORD NUMBER: 10 OF 14
|Main Title||Silica and nitrate depletion as related to rate of eutrophication in Lake Michigan, Lake Huron, and Lake Superior /|
|Author||Schelske, Claire L.|
|Publisher||University of Michigan, Great Lakes Research Division,|
|Subjects||Eutrophication--Great Lakes (North America) ; Eutrophication--Michigan, Lake. ; Eutrophication--Huron, Lake (Mich. and Ont.) ; Eutrophication--Superior, Lake. ; Nutrient pollution of water--Great Lakes (North America) ; Silica. ; Nitrates. ; Nitrate minerals.|
|Collation||48 leaves : ill., maps ; 28 cm.|
Cover title. "Presented at the 18th Congress of the International Association of Limnology, Symposium on Interactions Between Land and Water (co-sponsored by the International Association of Ecology), Leningrad, August 1971." Includes bibliographical references (leaves 44-48).
"Eutrophication of the Laurentian Great Lakes is accelerated by inputs of phosphorus from combined sources on land. Silica and nitrate nitrogen are depleted by phosphorus inputs due to an imbalance between the proportions of these nutrients required by phytoplankton assemblages and the proportions in either polluted tributary inputs or supplies in the lake. A model is used to relate increased phosphorus inputs, silica depletion, and nitrate depletion and to predict the trophic state or rate of eutrophication in Lakes Huron, Michigan, and Superior. Water quality is affected by inputs of phosphorus because standing crops of phytoplankton increase and because dominant groups of phytoplankton may change as the result of nutrient depletion. Silica depletion results in a shift from the characteristic diatom assemblages to blue-green or green algae and nitrate depletion favors assemblages with blue-green algae that fix nitrogen."--Abstract.