Record Display for the EPA National Library Catalog


Main Title Phytoplankton Productivity and Standing Crop in the Vicinity of the Lake Huron-Saginaw Bay Front.
Author Moll, Russell A. ; Davis, Curtiss O. ; Schelske, Claire L. ;
CORP Author Michigan Univ., Ann Arbor. Great Lakes Research Div.;Environmental Research Lab.-Duluth, MN.
Year Published 1980
Report Number CONTRIB-268; EPA-803086; EPA-600/J-80-418;
Stock Number PB83-243758
Additional Subjects Phytoplankton ; Biological productivity ; Water pollution ; Saginaw Bay ; Nutrients ; Mixing ; Water masses ; Inorganic silicates ; Nitrogen ; Biomass ; Decomposition ; Chlorophylls ; Settling ; Lake Huron ; Reprints ; Eutrophication
Library Call Number Additional Info Location Last
NTIS  PB83-243758 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
Continuous underway sampling was used in four research cruises near the mouth of Saginaw Bay in order to locate the bay-lake front, where eutrophic bay water mixes with oligotrophic Lake Huron water. Although mixing between these water masses normally occurs in outer Saginaw Bay, the distribution was variable, depending on wind force and direction as well as water temperature. Large algal crops in inner Saginaw Bay had reduced soluble nutrients, particularly silicate and nitrate-nitrogen, in the outer bay to levels lower than the adjacent lake water. Nonetheless, outer bay water supported high algal biomass and 14C uptake. The phytoplankton community at the nutrient front between bay and lake waters was characterized by high chlorophyll a biomass low 14C uptake (x=7.12 micrograms/l/h) and high bacterial activity indicating the presence of a senescent assemblage. Decomposition and settling of phytoplankton in the vicinity of the front apparently served to remove much of the bay plankton from the water column before mixing into the open lake.